In recent years, the increasing design complexity and the problems of power and heat dissipation have caused a shift in processor technology to favor Chip Multiprocessors. In Chip Multiprocessors (CMP) architecture, it is common that multiple cores share some on-chip cache. The sharing may cause cache thrashing and contention among co-running jobs. Job co-scheduling is an approach to tackling the problem by assigning jobs to cores appropriately so that the contention and consequent performance degradations are minimized. This dissertation aims to tackle two of the most prominent challenges in job co-scheduling. The first challenge is in the computational complexity for determining optimal job co-schedules. This dissertation presents one of the first systematic analyses on the complexity of job co-scheduling. Besides proving the NP completeness of job co-scheduling, it introduces a set of algorithms, based on graph theory and Integer/Linear Programming, for computing optimal co-schedules or their lower bounds in scenarios with or without job migrations. For complex cases, it empirically demonstrates the feasibility for approximating the optimal schedules effectively by proposing several heuristics-based algorithms. These discoveries facilitate the assessment of job co-schedulers by providing necessary baselines, and shed insights to the development of practical co-scheduling systems. The second challenge resides in the prediction of the performance of processes co-running on a shared cache. This dissertation explores the influence on co-run performance prediction imposed by co-runners, program inputs, and cache configurations. Through a sequence of formal analysis, we derive an analytical co-run locality model, uncovering the inherent statistical connections between the data references of programs single-runs and their co-run locality. The model offers theoretical insights on co-run locality analysis and leads to a lightweight approach for fast prediction of shared cache performance. We demonstrate the effectiveness of the model in enabling proactive job co-scheduling. Together, the two-dimensional findings open up many new opportunities for cache management on modern CMP by laying the foundation for job co-scheduling, and enhancing the understanding to data locality and cache sharing significantly.
{"title":"Analysis and approximation of optimal co-scheduling on cmp","authors":"Xipeng Shen, Yunlian Jiang","doi":"10.21220/S2-TJMJ-8K82","DOIUrl":"https://doi.org/10.21220/S2-TJMJ-8K82","url":null,"abstract":"In recent years, the increasing design complexity and the problems of power and heat dissipation have caused a shift in processor technology to favor Chip Multiprocessors. In Chip Multiprocessors (CMP) architecture, it is common that multiple cores share some on-chip cache. The sharing may cause cache thrashing and contention among co-running jobs. Job co-scheduling is an approach to tackling the problem by assigning jobs to cores appropriately so that the contention and consequent performance degradations are minimized. This dissertation aims to tackle two of the most prominent challenges in job co-scheduling. The first challenge is in the computational complexity for determining optimal job co-schedules. This dissertation presents one of the first systematic analyses on the complexity of job co-scheduling. Besides proving the NP completeness of job co-scheduling, it introduces a set of algorithms, based on graph theory and Integer/Linear Programming, for computing optimal co-schedules or their lower bounds in scenarios with or without job migrations. For complex cases, it empirically demonstrates the feasibility for approximating the optimal schedules effectively by proposing several heuristics-based algorithms. These discoveries facilitate the assessment of job co-schedulers by providing necessary baselines, and shed insights to the development of practical co-scheduling systems. The second challenge resides in the prediction of the performance of processes co-running on a shared cache. This dissertation explores the influence on co-run performance prediction imposed by co-runners, program inputs, and cache configurations. Through a sequence of formal analysis, we derive an analytical co-run locality model, uncovering the inherent statistical connections between the data references of programs single-runs and their co-run locality. The model offers theoretical insights on co-run locality analysis and leads to a lightweight approach for fast prediction of shared cache performance. We demonstrate the effectiveness of the model in enabling proactive job co-scheduling. Together, the two-dimensional findings open up many new opportunities for cache management on modern CMP by laying the foundation for job co-scheduling, and enhancing the understanding to data locality and cache sharing significantly.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73927995","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565950
K. Bushida;M. Noda;L.V. Panina;H. Yoshida;T. Uchiyama;K. Mohri
A large magneto-impedance (MI) effect was found in amorphous magnetic wires while passing a high-frequency current. The amplitude of the induced voltage between the ends of a wire changes by 40 to 50% when an external magnetic field of about 10 Oe (approximately 800 A/m) is applied parallel to the wire axis. This paper reports the principles and basic properties of the MI effect in very small amorphous wires of composition (Fe 0.06 Co 0.94 ) 72.5 Si 12.5 B 15 and magnetostriction -10 -7 , and describes an application to rotary encoder heads using very small MI elements 30 μm in diameter and 1 mm in length.
{"title":"Magneto-Impedance Element Using Amorphous Micro Wire","authors":"K. Bushida;M. Noda;L.V. Panina;H. Yoshida;T. Uchiyama;K. Mohri","doi":"10.1109/TJMJ.1994.4565950","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565950","url":null,"abstract":"A large magneto-impedance (MI) effect was found in amorphous magnetic wires while passing a high-frequency current. The amplitude of the induced voltage between the ends of a wire changes by 40 to 50% when an external magnetic field of about 10 Oe (approximately 800 A/m) is applied parallel to the wire axis. This paper reports the principles and basic properties of the MI effect in very small amorphous wires of composition (Fe\u0000<sub>0.06</sub>\u0000Co\u0000<sub>0.94</sub>\u0000)\u0000<sub>72.5</sub>\u0000Si\u0000<sub>12.5</sub>\u0000B\u0000<sub>15</sub>\u0000 and magnetostriction -10\u0000<sup>-7</sup>\u0000, and describes an application to rotary encoder heads using very small MI elements 30 μm in diameter and 1 mm in length.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"7-14"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565950","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873532","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565952
H. Wakiwaka;T. Umezawa;K. Kuwahara;H. Kamata;T. Yoshikawa
Acoustic vibration elements using giant magnetostrictive material (AVEG) are employed as vibration sources for under-sea acoustic propagation over distances of 1000 km or more. In this paper the magnetic circuit of the driving unit was analyzed using the finite element method. The flux density distribution is nonuniform in the magnetostrictive vibrator. Converting flux density B into magnetostriction ξ, we examine the difference in the shape variation and stress distribution of the magnetostrictive vibrator. We also show the influence on magnetic coupling of magnetostrictive vibrators that are constructed with eight pieces of the AVEG arranged octagonally.
{"title":"Examination of the Shape Variation and Stress Distribution of Vibration Elements Using Giant Magnetostrictive Material","authors":"H. Wakiwaka;T. Umezawa;K. Kuwahara;H. Kamata;T. Yoshikawa","doi":"10.1109/TJMJ.1994.4565952","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565952","url":null,"abstract":"Acoustic vibration elements using giant magnetostrictive material (AVEG) are employed as vibration sources for under-sea acoustic propagation over distances of 1000 km or more. In this paper the magnetic circuit of the driving unit was analyzed using the finite element method. The flux density distribution is nonuniform in the magnetostrictive vibrator. Converting flux density B into magnetostriction ξ, we examine the difference in the shape variation and stress distribution of the magnetostrictive vibrator. We also show the influence on magnetic coupling of magnetostrictive vibrators that are constructed with eight pieces of the AVEG arranged octagonally.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"21-26"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565952","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873535","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565970
T. Shimatsu;W. Kimura;M. Takahashi;T. Wakiyama
This paper discusses the correlation between soft magnetic properties and microscopic magnetic structure in Co-(0-6 at%) Fe-(7-10 at%) Ta-N nanocrystalline films. Increasing the Fe content improves the soft magnetic properties of the films by decreasing the local anisotropy fluctuation. The temperature dependence of the coercive force indicates that the decrease in the magnetocrystalline anisotropy at room temperature due to the increase in Fe content plays an important role in decreasing the local anisotropy fluctuation. Furthermore, with increasing Fe content the film magnetostriction decreases, which suggests that the magnitude of the linear magnetostriction decreases. On the other hand, the uniaxial magnetic anisotropy energy K u is reversibly induced by magnetic annealing in all films. As the Fe content is increased from 0 to 6 at% the magnitude of K u gradually rises, and the K u of films containing 6 at% Fe is about twice as large as that of films not containing Fe.
{"title":"Soft Magnetic Properties and Anisotropy of Co-Fe-Ta-N Films","authors":"T. Shimatsu;W. Kimura;M. Takahashi;T. Wakiyama","doi":"10.1109/TJMJ.1994.4565970","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565970","url":null,"abstract":"This paper discusses the correlation between soft magnetic properties and microscopic magnetic structure in Co-(0-6 at%) Fe-(7-10 at%) Ta-N nanocrystalline films. Increasing the Fe content improves the soft magnetic properties of the films by decreasing the local anisotropy fluctuation. The temperature dependence of the coercive force indicates that the decrease in the magnetocrystalline anisotropy at room temperature due to the increase in Fe content plays an important role in decreasing the local anisotropy fluctuation. Furthermore, with increasing Fe content the film magnetostriction decreases, which suggests that the magnitude of the linear magnetostriction decreases. On the other hand, the uniaxial magnetic anisotropy energy K\u0000<inf>u</inf>\u0000 is reversibly induced by magnetic annealing in all films. As the Fe content is increased from 0 to 6 at% the magnitude of K\u0000<inf>u</inf>\u0000 gradually rises, and the K\u0000<inf>u</inf>\u0000 of films containing 6 at% Fe is about twice as large as that of films not containing Fe.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"132-137"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565970","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68041819","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565951
M. Mizutani;L.V. Panina;K. Mohri
A new distance sensor described in this paper uses stepwise propagation of a domain wall by a pulse wire current train in a twisted magnetostrictive amorphous wire. A distance sensor of simple construction and with a length of 1000 mm was obtained. The sensor characteristics are controlled by applying torsion, and a suitable amount of torsion, with minimal nonlinearity, was identified. To improve the resolution of the sensor while preserving the good linearity, we tried changing the pulse shape of the driving current by adding a bias current to the pulse train current. A digital type distance sensor with a resolution of about 1 mm and nonlinearity of about 1% over the length of the 1000 mm long wire was achieved.
{"title":"Distance Sensors Using Domain Wall Propagation Driven by a Wire Current Pulse Train in Amorphous Magnetostrictive Wires","authors":"M. Mizutani;L.V. Panina;K. Mohri","doi":"10.1109/TJMJ.1994.4565951","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565951","url":null,"abstract":"A new distance sensor described in this paper uses stepwise propagation of a domain wall by a pulse wire current train in a twisted magnetostrictive amorphous wire. A distance sensor of simple construction and with a length of 1000 mm was obtained. The sensor characteristics are controlled by applying torsion, and a suitable amount of torsion, with minimal nonlinearity, was identified. To improve the resolution of the sensor while preserving the good linearity, we tried changing the pulse shape of the driving current by adding a bias current to the pulse train current. A digital type distance sensor with a resolution of about 1 mm and nonlinearity of about 1% over the length of the 1000 mm long wire was achieved.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"15-20"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565951","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873531","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565945
Contains an entry for each author and co-author included in this issue of the publication.
包含本期出版物中每位作者和合著者的条目。
{"title":"List of contributors","authors":"","doi":"10.1109/TJMJ.1994.4565945","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565945","url":null,"abstract":"Contains an entry for each author and co-author included in this issue of the publication.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"nil1-nil1"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565945","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67872880","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565977
Y. Nakagawa;H. Kato
The standard method for measuring magnetization, using a closed magnetic circuit, cannot be applied to rare earth magnet materials with very high coercivity. Hence in this paper we examine an open magnetic circuit method in a steady high magnetic field, in which correction for the demagnetizing field is important. We measured hysteresis curves for some commercial rare earth magnet materials by using cylindrical samples with various dimension ratios. The correction for the demagnetizing field gives a reasonable result for bonded magnets, whereas even the intrinsic coercivity seems to depend on the sample shape in the case of sintered magnets. Therefore, it is necessary to reconsider the correction for the demagnetizing field as well as the standard specifications of rare earth magnet materials.
{"title":"Magnetic Hysteresis and Demagnetizing-Field Correction for Rare Earth Magnet Materials","authors":"Y. Nakagawa;H. Kato","doi":"10.1109/TJMJ.1994.4565977","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565977","url":null,"abstract":"The standard method for measuring magnetization, using a closed magnetic circuit, cannot be applied to rare earth magnet materials with very high coercivity. Hence in this paper we examine an open magnetic circuit method in a steady high magnetic field, in which correction for the demagnetizing field is important. We measured hysteresis curves for some commercial rare earth magnet materials by using cylindrical samples with various dimension ratios. The correction for the demagnetizing field gives a reasonable result for bonded magnets, whereas even the intrinsic coercivity seems to depend on the sample shape in the case of sintered magnets. Therefore, it is necessary to reconsider the correction for the demagnetizing field as well as the standard specifications of rare earth magnet materials.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"177-184"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565977","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68041817","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565983
K. Saito;H. Nakamura;S. Sugimoto;M. Okada;M. Homma
The microstructures of Sm 2 Fe 17 N x (0≪x≪6) powders were observed by transmission electron microscopy (TEM). Sm 2 Fe 17 N 23 powders nitrided in N 2 gas have high dislocation densities due to lattice expansion. Sm 2 Fe 17 N x powders nitrided in a mixture of NH 3 and H 2 gases (3≪x≪6) have cell-like structures. The dislocation density increases and the cell diameter decreases with increasing N content, and Sm 2 Fe 17 N 5.9 powders consist of 30 to 50 nm in diameter Sm 2 Fe 17 N x microcrystalline grains surrounded by an amorphous phase. Sm 2 Fe 17 powders nitrided above 600°C dissociate into SmN and α-Fe phases with characteristic sizes of 10 to 20 nm.
{"title":"Microstructural Changes with N Content in Sm-Fe-N Alloys","authors":"K. Saito;H. Nakamura;S. Sugimoto;M. Okada;M. Homma","doi":"10.1109/TJMJ.1994.4565983","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565983","url":null,"abstract":"The microstructures of Sm\u0000<sub>2</sub>\u0000Fe\u0000<sub>17</sub>\u0000N\u0000<sub>x</sub>\u0000 (0≪x≪6) powders were observed by transmission electron microscopy (TEM). Sm\u0000<sub>2</sub>\u0000Fe\u0000<sub>17</sub>\u0000N\u0000<sub>23</sub>\u0000 powders nitrided in N\u0000<sub>2</sub>\u0000 gas have high dislocation densities due to lattice expansion. Sm\u0000<sub>2</sub>\u0000Fe\u0000<sub>17</sub>\u0000N\u0000<sub>x</sub>\u0000 powders nitrided in a mixture of NH\u0000<sub>3</sub>\u0000 and H\u0000<sub>2</sub>\u0000 gases (3≪x≪6) have cell-like structures. The dislocation density increases and the cell diameter decreases with increasing N content, and Sm\u0000<sub>2</sub>\u0000Fe\u0000<sub>17</sub>\u0000N\u0000<sub>5.9</sub>\u0000 powders consist of 30 to 50 nm in diameter Sm\u0000<sub>2</sub>\u0000Fe\u0000<sub>17</sub>\u0000N\u0000<sub>x</sub>\u0000 microcrystalline grains surrounded by an amorphous phase. Sm\u0000<sub>2</sub>\u0000Fe\u0000<sub>17</sub>\u0000 powders nitrided above 600°C dissociate into SmN and α-Fe phases with characteristic sizes of 10 to 20 nm.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"218-222"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565983","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873632","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565987
H. Koizumi;M. Sato;Y. Ando;S. Ishio;T. Miyazaki
The interlayer exchange coupling strength of 80Ni-Fe/Cu multilayer films prepared on a glass substrate by magnetron sputtering was studied by ferromagnetic resonance. The exchange coupling strength was evaluated by assuming a weak perpendicular magnetic anisotropy and fitting the data of the resonance fields and peak intensities. It exhibited a broad peak when the Cu thickness was 10.8Å, and increased linearly in proportion to the number of bilayers.
{"title":"FMR Study of Ni-Fe/Cu Multilayer Films","authors":"H. Koizumi;M. Sato;Y. Ando;S. Ishio;T. Miyazaki","doi":"10.1109/TJMJ.1994.4565987","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565987","url":null,"abstract":"The interlayer exchange coupling strength of 80Ni-Fe/Cu multilayer films prepared on a glass substrate by magnetron sputtering was studied by ferromagnetic resonance. The exchange coupling strength was evaluated by assuming a weak perpendicular magnetic anisotropy and fitting the data of the resonance fields and peak intensities. It exhibited a broad peak when the Cu thickness was 10.8Å, and increased linearly in proportion to the number of bilayers.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"242-246"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565987","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873633","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}
Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565989
H. Koumura;K. Niizuma;Y. Utsushikawa
The magnetic alloy Super Sendust (SS(I)) has a high saturation magnetization and high permeability. This paper reports on the magnetic properties of SS(I)/Fe multilayer thin films prepared by the ion beam shuttering method. As-deposited SS(I)(130Å)/Fe(130Å) multilayer thin films have a saturation magnetization of 1350 emu/cc, a coercive force of 2.2 Oe, and an effective permeability of 700. Multilayer thin film annealed at 350°C in vacuum for one hour exhibits a low coercive force of 0.5 Oe and a high effective permeability of 1250. Based on experimental results in which the soft magnetic properties were improved by heat treatment, it seems that internal stress relaxation is caused by a decrease in the interplanar spacing.
{"title":"Soft Magnetic Properties of Super Sendust/Fe Multilayer Thin Films Prepared by the IBS Method","authors":"H. Koumura;K. Niizuma;Y. Utsushikawa","doi":"10.1109/TJMJ.1994.4565989","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565989","url":null,"abstract":"The magnetic alloy Super Sendust (SS(I)) has a high saturation magnetization and high permeability. This paper reports on the magnetic properties of SS(I)/Fe multilayer thin films prepared by the ion beam shuttering method. As-deposited SS(I)(130Å)/Fe(130Å) multilayer thin films have a saturation magnetization of 1350 emu/cc, a coercive force of 2.2 Oe, and an effective permeability of 700. Multilayer thin film annealed at 350°C in vacuum for one hour exhibits a low coercive force of 0.5 Oe and a high effective permeability of 1250. Based on experimental results in which the soft magnetic properties were improved by heat treatment, it seems that internal stress relaxation is caused by a decrease in the interplanar spacing.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"255-260"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565989","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873529","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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