Y. Takamura, Y. Stutler, E. Matsushita, K. Shinohara, Taiji Suzuki, S. Nakagawa
Article / Book Information Title Perpendicular Magnetic Anisotropy in Full-Heusler Co2FeSi Alloy and MgO Bilayers Authors Yota Takamura, Yoshiya Stutler, Eisuke Matsushita, Kouki Shinohara, Takahiro Suzuki, Shigeki Nakagawa Citation Journal of the Magnetics Society of Japan, Vol. 43, No. 6, pp. 120-124 Pub. date 2019, 11 Copyright 本著作物の著作権は 公益社団法人日本磁気学会 (The Magnetics Society of Japan)が保有しています。 Note This file is author (final) version.
{"title":"Perpendicular Magnetic Anisotropy in Full-Heusler Co2FeSi Alloy and MgO Bilayers","authors":"Y. Takamura, Y. Stutler, E. Matsushita, K. Shinohara, Taiji Suzuki, S. Nakagawa","doi":"10.3379/msjmag.1911r004","DOIUrl":"https://doi.org/10.3379/msjmag.1911r004","url":null,"abstract":"Article / Book Information Title Perpendicular Magnetic Anisotropy in Full-Heusler Co2FeSi Alloy and MgO Bilayers Authors Yota Takamura, Yoshiya Stutler, Eisuke Matsushita, Kouki Shinohara, Takahiro Suzuki, Shigeki Nakagawa Citation Journal of the Magnetics Society of Japan, Vol. 43, No. 6, pp. 120-124 Pub. date 2019, 11 Copyright 本著作物の著作権は 公益社団法人日本磁気学会 (The Magnetics Society of Japan)が保有しています。 Note This file is author (final) version.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88740007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As a power supply method for electric vehicles (EVs), wireless power transmission is attracting attention because it allows to charge stationary EVs seamlessly and is not associated with cable-related problems such as forgetting to charge or leakage1-3). Wireless power transmission for EVs operates at a high frequency of 85 kHz. Since a high-frequency loss typically occurs in wireless power transfer coils4), the litz copper wire (LCW) with good high-frequency characteristics is generally used in wireless power transfer coils for EVs5-11). To improve the fuel efficiency of EVs, a weight reduction of the embedded coil is highly desirable. Furthermore, a coil that is inexpensive and easy to manufacture is required. To meet these requirements, we examined a relatively facile fabrication of a coil using an aluminum plate. However, the aluminum plate (AP) coil has a large AC resistance due to the proximity effect12). At the same time, this resistance can be reduced by coating the coil with a magnetic layer13-15). Therefore, we coated the AP coil with a magnetic composite material using a low-loss amorphous alloy powder achieving a magnetically coated plate (MCP) coil. In this study, the optimal magnetic composite material was analyzed using the finite element method (FEM). Furthermore, the impedance characteristics of the coil were evaluated, and the transmission efficiencies of the AP and MCP coils were measured using the double-LCC resonant circuit. (b) (a)
{"title":"Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate","authors":"S. Endo, Mitsuhide Sato, Y. Bu, T. Mizuno","doi":"10.3379/msjmag.1911r005","DOIUrl":"https://doi.org/10.3379/msjmag.1911r005","url":null,"abstract":"As a power supply method for electric vehicles (EVs), wireless power transmission is attracting attention because it allows to charge stationary EVs seamlessly and is not associated with cable-related problems such as forgetting to charge or leakage1-3). Wireless power transmission for EVs operates at a high frequency of 85 kHz. Since a high-frequency loss typically occurs in wireless power transfer coils4), the litz copper wire (LCW) with good high-frequency characteristics is generally used in wireless power transfer coils for EVs5-11). To improve the fuel efficiency of EVs, a weight reduction of the embedded coil is highly desirable. Furthermore, a coil that is inexpensive and easy to manufacture is required. To meet these requirements, we examined a relatively facile fabrication of a coil using an aluminum plate. However, the aluminum plate (AP) coil has a large AC resistance due to the proximity effect12). At the same time, this resistance can be reduced by coating the coil with a magnetic layer13-15). Therefore, we coated the AP coil with a magnetic composite material using a low-loss amorphous alloy powder achieving a magnetically coated plate (MCP) coil. In this study, the optimal magnetic composite material was analyzed using the finite element method (FEM). Furthermore, the impedance characteristics of the coil were evaluated, and the transmission efficiencies of the AP and MCP coils were measured using the double-LCC resonant circuit. (b) (a)","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81542511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tomoki Shimizu, M. Ohtake, M. Futamoto, F. Kirino, N. Inaba
1Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodagaya, Yokohama 240-8501, Japan 2Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan 3Graduate School of Fine Arts, Tokyo University of the Arts, 12-8 Ueno-koen, Taito-ku, Tokyo 110-8714, Japan 4Faculty of Engineering, Yamagata University, 4-3-16 Jyonan, Yonezawa, Yamagata 992-8510, Japan
{"title":"Influence of Cap-Layer on the Structure of FePt Alloy Thin Film Formed on VN and VC Underlayers","authors":"Tomoki Shimizu, M. Ohtake, M. Futamoto, F. Kirino, N. Inaba","doi":"10.3379/msjmag.1911r002","DOIUrl":"https://doi.org/10.3379/msjmag.1911r002","url":null,"abstract":"1Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodagaya, Yokohama 240-8501, Japan 2Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan 3Graduate School of Fine Arts, Tokyo University of the Arts, 12-8 Ueno-koen, Taito-ku, Tokyo 110-8714, Japan 4Faculty of Engineering, Yamagata University, 4-3-16 Jyonan, Yonezawa, Yamagata 992-8510, Japan","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84798386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We focus on accurate representations of hysteretic phenomena under pulse width modulation (PWM) inverter excitation using strong-coupling analysis of the magnetic field and the electric circuit. We perform the strong-coupling analysis by applying a dynamic hysteresis model (play model with the Cauer circuit) to a circuit simulator. We show that, by accounting for dead time properties, the numerical voltage waveforms obtained in our study are consistent with those obtained experimentally. Further, the accurate representations of the voltage waveform and of the high and wide band frequency indicate that the hysteresis curves simulated by our proposed strong-coupling analysis agree well with the measured results.
{"title":"Representation of Magnetic Hysteresis Phenomena Under Inverter Excitation in a Circuit Simulator Using Coupling Analysis of Electricity and Magnetism","authors":"A. Yao, T. Funaki, T. Hatakeyama","doi":"10.3379/msjmag.1911r001","DOIUrl":"https://doi.org/10.3379/msjmag.1911r001","url":null,"abstract":"We focus on accurate representations of hysteretic phenomena under pulse width modulation (PWM) inverter excitation using strong-coupling analysis of the magnetic field and the electric circuit. We perform the strong-coupling analysis by applying a dynamic hysteresis model (play model with the Cauer circuit) to a circuit simulator. We show that, by accounting for dead time properties, the numerical voltage waveforms obtained in our study are consistent with those obtained experimentally. Further, the accurate representations of the voltage waveform and of the high and wide band frequency indicate that the hysteresis curves simulated by our proposed strong-coupling analysis agree well with the measured results.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74233119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the high frequency permeability ( ) and ferromagnetic resonance(FMR) phenomena of a thin film with a strong perpendicular magnetic anisotropy and in-plane magnetically isotropic properties was measured using the short-circuited coaxial line technique; the analyzed sample had a toroidal shape. A field method was used for the background correction, where a strong magnetic bias field was applied and removed. However, when using a short-circuited coaxial line, the =1 condition cannot be achieved beyond a few ten GHz frequencies, whereas ferromagnetic resonance (denoted as FMR2) occurred because of the insufficient bias field. This resonance was compensated using the Landau-Lifshitz-Gilbert (LLG) equation, and the net - f properties without the bias field (denoted as FMR1) up to 30 GHz successfully extracted. Finally, a good agreement between the experimental results and the calculations based on the assumption of a magnetic multi-domain structure in
{"title":"Permeability Measurement up to 30 GHz of a Magnetically Isotropic Thin Film Using a Short-Circuited Coaxial Line","authors":"S. Takeda, H. Kijima-Aoki, H. Masumoto, H. Suzuki","doi":"10.3379/MSJMAG.1909R001","DOIUrl":"https://doi.org/10.3379/MSJMAG.1909R001","url":null,"abstract":"In this study, the high frequency permeability ( ) and ferromagnetic resonance(FMR) phenomena of a thin film with a strong perpendicular magnetic anisotropy and in-plane magnetically isotropic properties was measured using the short-circuited coaxial line technique; the analyzed sample had a toroidal shape. A field method was used for the background correction, where a strong magnetic bias field was applied and removed. However, when using a short-circuited coaxial line, the =1 condition cannot be achieved beyond a few ten GHz frequencies, whereas ferromagnetic resonance (denoted as FMR2) occurred because of the insufficient bias field. This resonance was compensated using the Landau-Lifshitz-Gilbert (LLG) equation, and the net - f properties without the bias field (denoted as FMR1) up to 30 GHz successfully extracted. Finally, a good agreement between the experimental results and the calculations based on the assumption of a magnetic multi-domain structure in","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79978709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The soft-heating method is an implantable hyperthermia method that can control the ultimate temperature of heating elements by using the Curie temperature of the magnetic material used in the element. It is a safe heating method. High heat generation has been achieved for heating elements by forming a metal ring around a core made of a ferrite-based magnetic material having a low Curie temperature. However, to generate a magnetic flux for heating deep inside the body, an exciting coil with a high withstand voltage and large allowable current has been required. In this research, we reduce the load on the exciting system, by developing a novel heating element using the LC-booster method. This wireless power transfer technology is excellent in matching with the load resistance and is proposed as a method for improving the performance of the heating element itself. Our proposed LC-booster method has better heat generation performance than the conventional methods. In addition, we prove that the performance could be improved by increasing the resonant frequency.
{"title":"Heating Performance of Soft-heating Element with LC-booster for Invasive Hyperthermia Therapy","authors":"T. Takura, S. Kajiwara, H. Kikuchi, H. Matsuki","doi":"10.3379/MSJMAG.1909R002","DOIUrl":"https://doi.org/10.3379/MSJMAG.1909R002","url":null,"abstract":"The soft-heating method is an implantable hyperthermia method that can control the ultimate temperature of heating elements by using the Curie temperature of the magnetic material used in the element. It is a safe heating method. High heat generation has been achieved for heating elements by forming a metal ring around a core made of a ferrite-based magnetic material having a low Curie temperature. However, to generate a magnetic flux for heating deep inside the body, an exciting coil with a high withstand voltage and large allowable current has been required. In this research, we reduce the load on the exciting system, by developing a novel heating element using the LC-booster method. This wireless power transfer technology is excellent in matching with the load resistance and is proposed as a method for improving the performance of the heating element itself. Our proposed LC-booster method has better heat generation performance than the conventional methods. In addition, we prove that the performance could be improved by increasing the resonant frequency.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89372101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Hitoshi, H. Kagaya, S. Izumi, K. Yashima, T. Takagi
The authors are developing magnetic stimulation coils for use in the treatment of dysphagia. The prototype coil manufactured in our previous research can induce large contraction of the suprahyoid muscles, which should be trained for normal swallowing. In this study, the heat generation in the coil during magnetic stimulation is investigated and suppressed. A numerical analysis showed that the main cause of the generated heat is the eddy current in the coil conductor induced by magnetic flux from the tip of the magnetic core. The analysis also showed that a parallel coil with a cross connection has an ideal current distribution in the coil conductor and thus best suppresses heat generation during magnetic stimulation. The heat-suppressing coil has parallel divided coil conductors and an appropriate connection between the conductors to level the current in each conductor. Moreover, measurements of the temperature rise in prototype coils during magnetic stimulation confirm that heat generation can be greatly suppressed by dividing the conductor and using an appropriate connection between the divided conductors.
{"title":"Suppression of Heat Generation in Magnetic Stimulation Coil Applied for Treating Dysphagia","authors":"M. Hitoshi, H. Kagaya, S. Izumi, K. Yashima, T. Takagi","doi":"10.3379/MSJMAG.1907R003","DOIUrl":"https://doi.org/10.3379/MSJMAG.1907R003","url":null,"abstract":"The authors are developing magnetic stimulation coils for use in the treatment of dysphagia. The prototype coil manufactured in our previous research can induce large contraction of the suprahyoid muscles, which should be trained for normal swallowing. In this study, the heat generation in the coil during magnetic stimulation is investigated and suppressed. A numerical analysis showed that the main cause of the generated heat is the eddy current in the coil conductor induced by magnetic flux from the tip of the magnetic core. The analysis also showed that a parallel coil with a cross connection has an ideal current distribution in the coil conductor and thus best suppresses heat generation during magnetic stimulation. The heat-suppressing coil has parallel divided coil conductors and an appropriate connection between the conductors to level the current in each conductor. Moreover, measurements of the temperature rise in prototype coils during magnetic stimulation confirm that heat generation can be greatly suppressed by dividing the conductor and using an appropriate connection between the divided conductors.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77451481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Ito, M. Hayashida, M. Mizuguchi, T. Suemasu, H. Yanagihara, K. Takanashi
L1 0 -FeNi films textured with the a-axis perpendicular to the film plane were successfully fabricated by denitriding FeNiN films. 20-nm-thick FeNiN films with two variants were epitaxially grown on SrTiO 3 (001), MgAl 2 O 4 (001), and MgO(001) substrates by molecular beam epitaxy. Denitriding was performed by annealing at 300 °C for 4 h under an H 2 gas atmosphere. The epitaxial relationships were L1 0 -FeNi[001](100) || substrate[100](001) and L1 0 -FeNi[010](100) || substrate[100](001). The uniaxial magnetic anisotropy energy (K u ) of the L1 0 -FeNi film was estimated to be 4.4 × 10 6 erg/cm 3 at room temperature by magnetic torque measurement. This K u value corresponds to a degree of long range order of 0.4.
{"title":"Fabrication of L10-FeNi films by denitriding FeNiN films","authors":"K. Ito, M. Hayashida, M. Mizuguchi, T. Suemasu, H. Yanagihara, K. Takanashi","doi":"10.3379/MSJMAG.1907R002","DOIUrl":"https://doi.org/10.3379/MSJMAG.1907R002","url":null,"abstract":"L1 0 -FeNi films textured with the a-axis perpendicular to the film plane were successfully fabricated by denitriding FeNiN films. 20-nm-thick FeNiN films with two variants were epitaxially grown on SrTiO 3 (001), MgAl 2 O 4 (001), and MgO(001) substrates by molecular beam epitaxy. Denitriding was performed by annealing at 300 °C for 4 h under an H 2 gas atmosphere. The epitaxial relationships were L1 0 -FeNi[001](100) || substrate[100](001) and L1 0 -FeNi[010](100) || substrate[100](001). The uniaxial magnetic anisotropy energy (K u ) of the L1 0 -FeNi film was estimated to be 4.4 × 10 6 erg/cm 3 at room temperature by magnetic torque measurement. This K u value corresponds to a degree of long range order of 0.4.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78102294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heat-assisted magnetic recording (HAMR) is a promising candidate as a next generation magnetic recording method that can operate beyond the trilemma limit1). We have already proposed a new HAMR model calculation2)~4). We have also shown in our improved model calculation that the signal-to-noise ratio derived by the conventionally used micromagnetic calculation can be explained using the temperature dependences of the grain magnetization reversal probability and the attempt period, whose inverse is the attempt frequency5). A feature of our model calculation is that it is easy to grasp the physical implication of the HAMR writing process and the calculation time is short. Since HAMR is a writing method in which the medium is heated to reduce coercivity at the time of writing, the coercivity of the medium can be reduced by any amount. However, micromagnetic simulation has shown that a relatively high writing field is necessary6). The actual HAMR system is very complicated, and various problems are intertwined. Therefore, we have separated problems in a simplified model using our model calculation. We have divided the topic of increasing writing field sensitivity into four problems using the bit error rate calculated with our model for HAMR, and we have discussed the calculation parameters related to the problems7). The four problems are write-error, erasure-after-write6), a statistical problem7), and the damping constant3). It has been reported that variation in the Curie temperature
{"title":"Impact of Curie Temperature Variation on Bit Error Rate in Heat-Assisted Magnetic Recording","authors":"T. Kobayashi, Y. Nakatani, Y. Fujiwara","doi":"10.3379/MSJMAG.1907R001","DOIUrl":"https://doi.org/10.3379/MSJMAG.1907R001","url":null,"abstract":"Heat-assisted magnetic recording (HAMR) is a promising candidate as a next generation magnetic recording method that can operate beyond the trilemma limit1). We have already proposed a new HAMR model calculation2)~4). We have also shown in our improved model calculation that the signal-to-noise ratio derived by the conventionally used micromagnetic calculation can be explained using the temperature dependences of the grain magnetization reversal probability and the attempt period, whose inverse is the attempt frequency5). A feature of our model calculation is that it is easy to grasp the physical implication of the HAMR writing process and the calculation time is short. Since HAMR is a writing method in which the medium is heated to reduce coercivity at the time of writing, the coercivity of the medium can be reduced by any amount. However, micromagnetic simulation has shown that a relatively high writing field is necessary6). The actual HAMR system is very complicated, and various problems are intertwined. Therefore, we have separated problems in a simplified model using our model calculation. We have divided the topic of increasing writing field sensitivity into four problems using the bit error rate calculated with our model for HAMR, and we have discussed the calculation parameters related to the problems7). The four problems are write-error, erasure-after-write6), a statistical problem7), and the damping constant3). It has been reported that variation in the Curie temperature","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90903133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We experimentally and numerically examined the magnetic properties of magnetic materials under roomand high-temperature inverter excitations. We show that the iron loss and hysteresis properties of magnetic materials under pulse width modulation (PWM) inverter excitation depend strongly on the temperature dependence of semiconductor characteristics. The iron loss under PWM inverter excitation decreased as the temperatures of semiconductors (Si-insulated gate bipolar transistors and Si-diodes) increased. In addition, it was found that the rate of change of iron loss based on the temperature dependence of semiconductor characteristics at a high carrier frequency was larger than that at a low carrier frequency.
{"title":"Iron Loss and Hysteresis Properties under High-Temperature Inverter Excitation","authors":"A. Yao, T. Hatakeyama","doi":"10.3379/MSJMAG.1905R002","DOIUrl":"https://doi.org/10.3379/MSJMAG.1905R002","url":null,"abstract":"We experimentally and numerically examined the magnetic properties of magnetic materials under roomand high-temperature inverter excitations. We show that the iron loss and hysteresis properties of magnetic materials under pulse width modulation (PWM) inverter excitation depend strongly on the temperature dependence of semiconductor characteristics. The iron loss under PWM inverter excitation decreased as the temperatures of semiconductors (Si-insulated gate bipolar transistors and Si-diodes) increased. In addition, it was found that the rate of change of iron loss based on the temperature dependence of semiconductor characteristics at a high carrier frequency was larger than that at a low carrier frequency.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82500668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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