Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1464310
T. Komine, T. Takahashi, S. Ishii, R. Sugita, T. Muranoi, Y. Hasegawa
Micromagnetic calculations of the magnetic domain walls in 2-dimensional and 3-dimensional nanocontacts of permalloys were reported. The magnetic domain wall at 3D-nanocontact is smaller than that of 2D-nanocontact thus it is more adequate for domain wall confinement and large magnetoresistance effect.
{"title":"Micromagnetic analysis of a magnetic domain wall in a nanocontact","authors":"T. Komine, T. Takahashi, S. Ishii, R. Sugita, T. Muranoi, Y. Hasegawa","doi":"10.1109/INTMAG.2005.1464310","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1464310","url":null,"abstract":"Micromagnetic calculations of the magnetic domain walls in 2-dimensional and 3-dimensional nanocontacts of permalloys were reported. The magnetic domain wall at 3D-nanocontact is smaller than that of 2D-nanocontact thus it is more adequate for domain wall confinement and large magnetoresistance effect.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132786299","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1463683
A. Chekanov, E. Abarra, G. Choe
A residual magnetization in the pole-tip of perpendicular magnetic recording (PMR) write heads may induce erasure of the data track under the pole even when the write element is not energized. Much of the work has been in improving head design to reduce pole-tip erasure (PTE). However, it has been reported that magnetic flux from the medium may also aggravate PTE. This paper investigates the effect of the medium magnetization state, write current, and selected medium properties such as dynamic coercivity on PTE.
{"title":"Reduction of write pole-tip erasure in perpendicular magnetic recording by track magnetization state and media design","authors":"A. Chekanov, E. Abarra, G. Choe","doi":"10.1109/INTMAG.2005.1463683","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463683","url":null,"abstract":"A residual magnetization in the pole-tip of perpendicular magnetic recording (PMR) write heads may induce erasure of the data track under the pole even when the write element is not energized. Much of the work has been in improving head design to reduce pole-tip erasure (PTE). However, it has been reported that magnetic flux from the medium may also aggravate PTE. This paper investigates the effect of the medium magnetization state, write current, and selected medium properties such as dynamic coercivity on PTE.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130704127","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1464073
J. Yin, J. Ding, B. Liu, Y. Wang, Y. Yi
Co-ferrite thin films are interesting for magnetic recording and magneto-optical devices. In this work, we have prepared Co-ferrite thin films on SiO/sub 2/ substrate with high coercivity by sputtering and PLD. The film thickness was around 50 nm. All the films were subsequently annealed at a temperature of 500 to 1000/spl deg/C. As-sputtered Co-ferrite film possessed an amorphous-like structure, as no X-ray diffraction peak was observed. Crystallization required an annealing at 500/spl deg/C or higher. High coercivity was obtained after annealing at 900-1000/spl deg/C. High coercivity was associated with nanostructure. Hysteresis loops of the samples were annealed at 900/spl deg/C. It has been found out that substrate also played an important role. Similar trend of magnetic properties was observed in PLD-derived samples.
{"title":"High-coercivity Co-ferrite thin films on SiO/sub 2/(100) substrate prepared by sputtering and PLD","authors":"J. Yin, J. Ding, B. Liu, Y. Wang, Y. Yi","doi":"10.1109/INTMAG.2005.1464073","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1464073","url":null,"abstract":"Co-ferrite thin films are interesting for magnetic recording and magneto-optical devices. In this work, we have prepared Co-ferrite thin films on SiO/sub 2/ substrate with high coercivity by sputtering and PLD. The film thickness was around 50 nm. All the films were subsequently annealed at a temperature of 500 to 1000/spl deg/C. As-sputtered Co-ferrite film possessed an amorphous-like structure, as no X-ray diffraction peak was observed. Crystallization required an annealing at 500/spl deg/C or higher. High coercivity was obtained after annealing at 900-1000/spl deg/C. High coercivity was associated with nanostructure. Hysteresis loops of the samples were annealed at 900/spl deg/C. It has been found out that substrate also played an important role. Similar trend of magnetic properties was observed in PLD-derived samples.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130757990","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1464084
J. Bai, Jianping Wang
Nanoparticle deposition gun and on-line co-sputtering technique was used to prepare core-shell type Au@Fe/sub 65/Co/sub 35/ nanostructures on glass substrates. The crystallization, texture and nanostructures were observed by using transmission electron microscopy (TEM), while the magnetic properties of the nanoparticles were measured by the use of a vibrating sample magnetometer. TEM observations including bright/dark images and diffraction patterns showed that all FeCo nanoparticles are single crystals and show random orientations. The hysteresis loop measured at room temperature has an average diameter of about 23 nm, and the coercivity is about 60 Oe. Au shell thickness is about 1-2 nm.
{"title":"Fabrication of core-shell type magnetic nanoparticles by a nanocluster deposition technique","authors":"J. Bai, Jianping Wang","doi":"10.1109/INTMAG.2005.1464084","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1464084","url":null,"abstract":"Nanoparticle deposition gun and on-line co-sputtering technique was used to prepare core-shell type Au@Fe/sub 65/Co/sub 35/ nanostructures on glass substrates. The crystallization, texture and nanostructures were observed by using transmission electron microscopy (TEM), while the magnetic properties of the nanoparticles were measured by the use of a vibrating sample magnetometer. TEM observations including bright/dark images and diffraction patterns showed that all FeCo nanoparticles are single crystals and show random orientations. The hysteresis loop measured at room temperature has an average diameter of about 23 nm, and the coercivity is about 60 Oe. Au shell thickness is about 1-2 nm.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130761704","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1463535
M. Tsutomu, K. Masanori, T. Fumiaki, K. Masashi, Y. Hajime
Largemotor constant isnecessary for linearactuators (LAs) usedin factory automation equipment to realize the miniaturization and the high respondency. This paper describes the comparison of the motor constant between a trial LA and convcntional linear motors, the trial LA is designed by using permeance method and finite element method in order to actualize these demands.
{"title":"Cylindrical moving magnet type linear actuator having large motor constant","authors":"M. Tsutomu, K. Masanori, T. Fumiaki, K. Masashi, Y. Hajime","doi":"10.1109/INTMAG.2005.1463535","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463535","url":null,"abstract":"Largemotor constant isnecessary for linearactuators (LAs) usedin factory automation equipment to realize the miniaturization and the high respondency. This paper describes the comparison of the motor constant between a trial LA and convcntional linear motors, the trial LA is designed by using permeance method and finite element method in order to actualize these demands.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131173212","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1463739
A. Phirouznia, M. M. Tehranchi, M. Ghanaastshoar
A theory is suggested in this study which predicts both positive and negative magnetoresistances (MRs) due to the domain wall (DW) in weak magnetic fields. The analysis showed two distinct regimes which are specified by the impurity density, the Fermi wave vector of the system and the external magnetic field. These two regimes correspond to positive and negative MRs. When the Zeeman interaction strength is comparable to the impurity scattering amplitude at Fermi level, the contribution of the DW to MR should be negative, also it can be shown analytically that, in contrast to the pure system for an impure DW, MR is not symmetric for magnetic fields which are parallel or anti-parallel to the DW rotation axis, and for a pure DW, the contribution to the MR is always positive.
{"title":"Domain wall magnetoresistance in a quantum wire","authors":"A. Phirouznia, M. M. Tehranchi, M. Ghanaastshoar","doi":"10.1109/INTMAG.2005.1463739","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463739","url":null,"abstract":"A theory is suggested in this study which predicts both positive and negative magnetoresistances (MRs) due to the domain wall (DW) in weak magnetic fields. The analysis showed two distinct regimes which are specified by the impurity density, the Fermi wave vector of the system and the external magnetic field. These two regimes correspond to positive and negative MRs. When the Zeeman interaction strength is comparable to the impurity scattering amplitude at Fermi level, the contribution of the DW to MR should be negative, also it can be shown analytically that, in contrast to the pure system for an impure DW, MR is not symmetric for magnetic fields which are parallel or anti-parallel to the DW rotation axis, and for a pure DW, the contribution to the MR is always positive.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130751254","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1463510
Y. Tanaka
Hard disk drive has quickly flooded into mobile fields. Some of the latest representing applications are slim laptop computers, car navigation systems, portable music players and portable photo/video viewers. This is the largest paradigm shift for the hard disk drive application in terms of the environmental condition under which hard disk drives are in operation. The hard disk drives in the new portable applications may operate in wider temperature range and need to resist much severer vibration and shock conditions than conventional cases. In order to propel the future possible application of portable storage devices, the magnetic recording technology for future hard disk drive must have strong environmental robustness along with high density recording performance. Intrinsic magnetic features of perpendicular recording are studied as the backbone for designing future high density hard disk drive systems. By considering portable use of the small form factor hard disk drives, some of the distinguished features play a significant role to attain required performance such as thermal reliability and operational conditions. In this paper, the performance consideration for high density perpendicular magnetic recording and the impact to future small form factor design direction are discussed.
{"title":"Fundamental features of perpendicular magnetic recording and the design consideration for future portable HDD integration","authors":"Y. Tanaka","doi":"10.1109/INTMAG.2005.1463510","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463510","url":null,"abstract":"Hard disk drive has quickly flooded into mobile fields. Some of the latest representing applications are slim laptop computers, car navigation systems, portable music players and portable photo/video viewers. This is the largest paradigm shift for the hard disk drive application in terms of the environmental condition under which hard disk drives are in operation. The hard disk drives in the new portable applications may operate in wider temperature range and need to resist much severer vibration and shock conditions than conventional cases. In order to propel the future possible application of portable storage devices, the magnetic recording technology for future hard disk drive must have strong environmental robustness along with high density recording performance. Intrinsic magnetic features of perpendicular recording are studied as the backbone for designing future high density hard disk drive systems. By considering portable use of the small form factor hard disk drives, some of the distinguished features play a significant role to attain required performance such as thermal reliability and operational conditions. In this paper, the performance consideration for high density perpendicular magnetic recording and the impact to future small form factor design direction are discussed.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131114140","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1464148
S. Hisatomi, A. Yamazaki, M. Sendoh, S. Agatsuma, K. Ishiyama, K. Arai
Micropumps are studied for applications to /spl mu/TAS (micro total analysis system) systems for automatic medication, and so on. The principals of the micropumps are using piezoelectric materials, SMA (shape memory alloy), etc. In this study, we propose a micropump using a magnetic micromachine. As the magnetic micromachines work wirelessly, we can obtain a wireless micropump that is suitable for the miniaturization. In previous studies, we examined the basic properties of the pump, and we found that the produced pressure could be controlled by the frequency of the applied rotational magnetic field. In this study, we examined the properties of the pump such as the pressure and the flow rate. In addition, we proposed a disposable pump system using the magnetic micromachine.
{"title":"Micropump with magnetic micromachine","authors":"S. Hisatomi, A. Yamazaki, M. Sendoh, S. Agatsuma, K. Ishiyama, K. Arai","doi":"10.1109/INTMAG.2005.1464148","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1464148","url":null,"abstract":"Micropumps are studied for applications to /spl mu/TAS (micro total analysis system) systems for automatic medication, and so on. The principals of the micropumps are using piezoelectric materials, SMA (shape memory alloy), etc. In this study, we propose a micropump using a magnetic micromachine. As the magnetic micromachines work wirelessly, we can obtain a wireless micropump that is suitable for the miniaturization. In previous studies, we examined the basic properties of the pump, and we found that the produced pressure could be controlled by the frequency of the applied rotational magnetic field. In this study, we examined the properties of the pump such as the pressure and the flow rate. In addition, we proposed a disposable pump system using the magnetic micromachine.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"94 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133036623","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1464094
A. Hashimoto, S. Saito, M. Takahashi, N. Mukia
On the purpose of reducing fabrication process, the development of the noble substrate with soft underlayer by means of controlling the microstructure and crystal orientation of a plated soft magnetic layer was carried out. A 2.5-inch Al/NiP disk was prepared as a rigid body of a substrate, and electroless-plated NiFe was used as the soft magnetic material. The structure was examined by cross-sectional transmission electron microscopy, and the magnetic properties were evaluated by vibrating sample magnetometer and longitudinal Kerr equipment. Resulting facts indicate that fabrication of moderate crystal-oriented seed layer can control grain size and crystal orientation of plated NiFe grains by epitaxial growth.
{"title":"Noble development of Al/NiP substrate with soft magnetic underlayer formation of nano-crystalline and (111) orientation of plated NiFe film","authors":"A. Hashimoto, S. Saito, M. Takahashi, N. Mukia","doi":"10.1109/INTMAG.2005.1464094","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1464094","url":null,"abstract":"On the purpose of reducing fabrication process, the development of the noble substrate with soft underlayer by means of controlling the microstructure and crystal orientation of a plated soft magnetic layer was carried out. A 2.5-inch Al/NiP disk was prepared as a rigid body of a substrate, and electroless-plated NiFe was used as the soft magnetic material. The structure was examined by cross-sectional transmission electron microscopy, and the magnetic properties were evaluated by vibrating sample magnetometer and longitudinal Kerr equipment. Resulting facts indicate that fabrication of moderate crystal-oriented seed layer can control grain size and crystal orientation of plated NiFe grains by epitaxial growth.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133038067","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 : 2005-04-04DOI: 10.1109/INTMAG.2005.1463586
M. Alinejad, N. Tajabor, A. Amirabadizadeh, F. Pourarian
In this research, magnetoelastic properties of Pr6Fe 11Ga3 alloy is studied by magnetostriction and thermal expansion measurements. The phase purity and micro-structure of the sample are studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. Temperature dependence of spontaneous volume magnetostriction for this alloy shows an increase as temperature decreases below Curie temperature TC = 320 K through a sequence of two steps. First step appears in the vicinity of TC and second one starts around 280 K. This originated from magnetoelastic effects of short range ferromagnetic order that have a nature of Fe-Fe exchange interaction. The second step is attributed to the gradual long range ordering of magnetic moments which is necessary for low temperature ferrimagnetic phase. At low field region, magnetorestrictive strain is small and smoothly increases for increasing fields. Observed increase in threshold field Ha at lower temperatures is attributed to the enhancing magnetocrystalline anisotropy of Pr sublattices. Also, as field increases over Ha, magnetic moments gradually rotates with domain walls motion
{"title":"Magnetostrictive strin effects in Pr/sub 6/Fe/sub 11/Ga/sub 3/ alloy","authors":"M. Alinejad, N. Tajabor, A. Amirabadizadeh, F. Pourarian","doi":"10.1109/INTMAG.2005.1463586","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463586","url":null,"abstract":"In this research, magnetoelastic properties of Pr6Fe 11Ga3 alloy is studied by magnetostriction and thermal expansion measurements. The phase purity and micro-structure of the sample are studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. Temperature dependence of spontaneous volume magnetostriction for this alloy shows an increase as temperature decreases below Curie temperature TC = 320 K through a sequence of two steps. First step appears in the vicinity of TC and second one starts around 280 K. This originated from magnetoelastic effects of short range ferromagnetic order that have a nature of Fe-Fe exchange interaction. The second step is attributed to the gradual long range ordering of magnetic moments which is necessary for low temperature ferrimagnetic phase. At low field region, magnetorestrictive strain is small and smoothly increases for increasing fields. Observed increase in threshold field Ha at lower temperatures is attributed to the enhancing magnetocrystalline anisotropy of Pr sublattices. Also, as field increases over Ha, magnetic moments gradually rotates with domain walls motion","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131995494","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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