M. Ishibashi, Y. Shiota, S. Funada, T. Moriyama, T. Ono
We report antiferromagnetic spin wave resonance in perpendicularly magnetized synthetic antiferromagnets consisting of Co/Ni multilayers and a thin Ru spacer layer. Two resonance modes were observed in the finite range of the out-of-plane bias magnetic field, where two magnetic moments separated by the Ru layer were antiferromagnetically aligned. These two modes show an opposite dependence on the bias magnetic field and correspond to right- and left-handed polarized spin waves. We also theoretically derive the spin wave dispersion for the perpendicularly magnetized synthetic antiferromagnets on the basis of an equation of motion. Our experimental results show good agreement with the theoretical analysis.
{"title":"Spin Wave Resonance in Perpendicularly Magnetized Synthetic Antiferromagnets","authors":"M. Ishibashi, Y. Shiota, S. Funada, T. Moriyama, T. Ono","doi":"10.3379/MSJMAG.2103R004","DOIUrl":"https://doi.org/10.3379/MSJMAG.2103R004","url":null,"abstract":"We report antiferromagnetic spin wave resonance in perpendicularly magnetized synthetic antiferromagnets consisting of Co/Ni multilayers and a thin Ru spacer layer. Two resonance modes were observed in the finite range of the out-of-plane bias magnetic field, where two magnetic moments separated by the Ru layer were antiferromagnetically aligned. These two modes show an opposite dependence on the bias magnetic field and correspond to right- and left-handed polarized spin waves. We also theoretically derive the spin wave dispersion for the perpendicularly magnetized synthetic antiferromagnets on the basis of an equation of motion. Our experimental results show good agreement with the theoretical analysis.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88449700","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 : 2021-03-01DOI: 10.3379/MSJMAG.2101RV001
M. Nakano
{"title":"Miniaturized Permanent Magnets Applied to Extremely Small Stepping Motors","authors":"M. Nakano","doi":"10.3379/MSJMAG.2101RV001","DOIUrl":"https://doi.org/10.3379/MSJMAG.2101RV001","url":null,"abstract":"","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"10 1","pages":"12-15"},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78485954","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}
Tetsuya Ikebuchi, Yuushou Hirata, S. Funada, A. Tsukamoto, H. Ito, Kosuke Suzuki, K. Hoshi, N. Tsuji, H. Sakurai, Y. Shiota, T. Moriyama, T. Ono
Yoichi Shiota, Takahiro Moriyama, and Teruo Ono**** Institute for Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan *College of Science and Technology, Nihon University, Narashino-dai Funabashi, Chiba 274-8501, Japan **Department of Electronics and Informatics, Gunma University, Tenjin-cho Kiryu, Gunma 376-8515, Japan ***JASRI, Kouto Sayo-cho, Hyogo 679-5198, Japan ****Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
{"title":"Estimation of Angular Momentum Compensation Temperature in GdFe Film by Magnetic Compton Scattering","authors":"Tetsuya Ikebuchi, Yuushou Hirata, S. Funada, A. Tsukamoto, H. Ito, Kosuke Suzuki, K. Hoshi, N. Tsuji, H. Sakurai, Y. Shiota, T. Moriyama, T. Ono","doi":"10.3379/msjmag.2101l002","DOIUrl":"https://doi.org/10.3379/msjmag.2101l002","url":null,"abstract":"Yoichi Shiota, Takahiro Moriyama, and Teruo Ono**** Institute for Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan *College of Science and Technology, Nihon University, Narashino-dai Funabashi, Chiba 274-8501, Japan **Department of Electronics and Informatics, Gunma University, Tenjin-cho Kiryu, Gunma 376-8515, Japan ***JASRI, Kouto Sayo-cho, Hyogo 679-5198, Japan ****Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"694 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74747355","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}
{"title":"Prototype Tests of Outer-Rotor-type High-Speed PM Motor","authors":"S. Sakurai, K. Nakamura","doi":"10.3379/MSJMAG.2105R012","DOIUrl":"https://doi.org/10.3379/MSJMAG.2105R012","url":null,"abstract":"","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74782872","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}
Y. Nakamura, M. Ohtake, T. Kawai, M. Futamoto, F. Kirino, N. Inaba
{"title":"Influence of B Content on the Magnetostrictive Properties of Single-Crystalline, Poly-Crystalline, and Amorphous Fe-Co-B Alloy Films","authors":"Y. Nakamura, M. Ohtake, T. Kawai, M. Futamoto, F. Kirino, N. Inaba","doi":"10.3379/msjmag.2111r001","DOIUrl":"https://doi.org/10.3379/msjmag.2111r001","url":null,"abstract":"","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"164 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86215567","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}
{"title":"Temperature difference dependence of coercivity of spin Seebeck voltage for BiY2Fe5O12/Pt device made by metal organic decomposition method","authors":"Y. Takahashi, T. Takase, K. Yamaguchi","doi":"10.3379/MSJMAG.2105R010","DOIUrl":"https://doi.org/10.3379/MSJMAG.2105R010","url":null,"abstract":"","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79100999","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}
Y. Mizuana, K. Nakamura, Y. Suzuki, Y. Oishi, Y. Tachiya, K. Kuritan
{"title":"Performance Improvement of Spoke-shaped Interior Permanent Magnet Magnetic Gear","authors":"Y. Mizuana, K. Nakamura, Y. Suzuki, Y. Oishi, Y. Tachiya, K. Kuritan","doi":"10.3379/msjmag.2105r008","DOIUrl":"https://doi.org/10.3379/msjmag.2105r008","url":null,"abstract":"","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75353405","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}
{"title":"Negative Spin-Polarization Tri-Layer STO for MAMR","authors":"I. Tagawa","doi":"10.3379/msjmag.2201r001","DOIUrl":"https://doi.org/10.3379/msjmag.2201r001","url":null,"abstract":"","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75948519","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. Ogura, M. Takahashi, N. Nakatani, N. Ishii, Y. Miyamoto
We have developed magnetic nanowire memories with no mechanical moving parts in order to achieve the large-capacity and ultra-high data transfer rates required for spatial imaging three-dimensional television (3D-TV). In a magnetic nanowire, binary information is recorded by means of a magnetic field induced by two recording wires that are orthogonally fabricated above the nanowire. We simulated the magnetic domain formation process and found that it was formed stably in a magnetic nanowire when we utilized two recording wires. In addition, by adding a certain time difference to the current, the magnetic domains were formed with low current density. We analyzed the behavior inside the magnetic nanowire and found that magnetization reversal can be achieved at low current density when torque is applied at the appropriate time during the precession of the magnetic moment.
{"title":"Magnetization Analysis of Magnetic Nanowire Memory Utilizing Two Recording Metal Wires for Low Current Recording","authors":"K. Ogura, M. Takahashi, N. Nakatani, N. Ishii, Y. Miyamoto","doi":"10.3379/msjmag.2201r002","DOIUrl":"https://doi.org/10.3379/msjmag.2201r002","url":null,"abstract":"We have developed magnetic nanowire memories with no mechanical moving parts in order to achieve the large-capacity and ultra-high data transfer rates required for spatial imaging three-dimensional television (3D-TV). In a magnetic nanowire, binary information is recorded by means of a magnetic field induced by two recording wires that are orthogonally fabricated above the nanowire. We simulated the magnetic domain formation process and found that it was formed stably in a magnetic nanowire when we utilized two recording wires. In addition, by adding a certain time difference to the current, the magnetic domains were formed with low current density. We analyzed the behavior inside the magnetic nanowire and found that magnetization reversal can be achieved at low current density when torque is applied at the appropriate time during the precession of the magnetic moment.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82946029","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 examine the dependence of information stability on certain medium parameters, namely mean Curie temperature, grain height, and anisotropy constant ratio in 4 Tbpsi heat-assisted magnetic recording, for 10 years of archiving. We introduce a minimum normalized readout field H 0 after 10 years of archiving and an information degradation rate R 0 during 10 years of archiving. To interpret the results, we investigate whether there is a correlation between H 0 or R 0 and an effective thermal stability factor for 9 and 6 grains/bit. We find that there is a strong correlation since the anisotropy constant is much larger than the shape anisotropy. The H 0 and R 0 values are functions of the effective thermal stability factor and grain number, and are independent of grain number per bit. The effective thermal stability factor necessary for no information degradation is more than about 120. Furthermore, there is a weak correlation between the initial readout field or minimum readout field after 10 years of archiving and the effective thermal stability factor.
{"title":"Information Degradation during Archiving in Heat-Assisted Magnetic Recording","authors":"T. Kobayashi, Y. Nakatani, Y. Fujiwara","doi":"10.3379/msjmag.2201r003","DOIUrl":"https://doi.org/10.3379/msjmag.2201r003","url":null,"abstract":"We examine the dependence of information stability on certain medium parameters, namely mean Curie temperature, grain height, and anisotropy constant ratio in 4 Tbpsi heat-assisted magnetic recording, for 10 years of archiving. We introduce a minimum normalized readout field H 0 after 10 years of archiving and an information degradation rate R 0 during 10 years of archiving. To interpret the results, we investigate whether there is a correlation between H 0 or R 0 and an effective thermal stability factor for 9 and 6 grains/bit. We find that there is a strong correlation since the anisotropy constant is much larger than the shape anisotropy. The H 0 and R 0 values are functions of the effective thermal stability factor and grain number, and are independent of grain number per bit. The effective thermal stability factor necessary for no information degradation is more than about 120. Furthermore, there is a weak correlation between the initial readout field or minimum readout field after 10 years of archiving and the effective thermal stability factor.","PeriodicalId":36791,"journal":{"name":"Journal of the Magnetics Society of Japan","volume":"148 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80654227","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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