研究者詳細 - 竹澤　昌晃

論文 - 竹澤　昌晃

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高分解能Kerr効果顕微鏡を用いたNd-Fe-B系微細結晶粒磁石の磁区観察と磁化過程解析

竹澤昌晃

日本金属学会誌 ( 日本金属学会 ) 76 ( 1 ) 48 - 51 2012年01月

Magnetic Domain Observation of Nd-Fe-B Sintered Magnets at Elevated Temperatures by Using Kerr Microscope 査読有り

M. Takezawa, Y. Nagashima, Y. Morimoto and J. Yamasaki

IEEE Trans. Magn. 47 ( 10 ) 3256 - 3258 2011年10月

Magnetic Domain Observation of Nd-Fe-B Magnets with Submicron-Sized Grains by High-Resolution Kerr Microscopy 査読有り

M. Takezawa,N. Tani,Y. Nagashima,Y. Morimoto,J. Yamasaki,N. Nozawa,T. Nishiuchi and S. Hirosawa

J. Appl. Phys. 109 ( 7 ) 07A709.1 - 07A709.3 2011年03月

HDDR 磁粉の短時間ホットプレス法で得られたNd-Fe-B 系微結晶磁石の組織と保磁力

野澤宣介, 西内武司, 広沢哲, Hossein Sepehri-Amin, 大久保忠勝, 宝野和博, 竹澤昌晃, 丸子覚博, 谷奈緒美, 森本祐治, 山崎二郎

日立金属技報 27 34 - 41 2011年02月

Micromagnetic simulation of wall transition structures with self-induced helical anisotropy and their pinning effects 査読有り

Asada H., Kubo H., Yamasaki J., Takezawa M., Koyanagi T.

Journal of Physics: Conference Series 200 ( SECTION 4 ) 2010年09月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A three-dimensional micromagnetic simulation has been performed to clarify the effect of self-induced anisotropy on domain wall behaviours, such as wall broadening and wall pinning, with wall transitions. Simulation results of the broadening of the domain wall with the transitions agree qualitatively with the Kerr microscope observation: for the wall transition which has a Bloch line between two C-shaped walls without a cap switch at each surface, the broadening of each Neel cap mainly occurs toward the opposite directions and the jog along the wall also becomes larger; for the wall transition which has a cap switch with a Bloch line, Neel caps still keep the same position after broadening. Details of pinning characteristics of the domain walls with the wall transitions by the self-induced helical anisotropy will also be presented. © 2010 IOP Publishing Ltd.

DOI： 10.1088/1742-6596/200/4/042003

Scopus

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Recent Efforts Toward Rare-Metal-Free Permanent Magnets in Japan 査読有り

S. Hirosawa,T. Nishiuchi,N. Nozawa,T. Ohkubo,K. Hono,H. Sepehri-Amin,M. Takezawa,J. Yamasaki,S. Yamanuro,T. Tanaka,M. Okano and K. Sumiyama

Proceedings of the 21st Workshop on Rare-Earth Permanent Magnets and their Applications, Bled, Slovenia 21 187 - 192 2010年09月

Magnetic Domain Observation of Hydrogenation-Disproportionation- Desorption-Recombination Processed Nd-Fe-B Magnets with High- Resolution Kerr Microscope Using Ultraviolet Light 査読有り

M. Takezawa,K. Maruko,N. Tani,Y. Morimoto,J. Yamasaki,N. Nozawa,T. Nishiuchi and S. Hirosawa

Proceedings of the 21st Workshop on Rare-Earth Permanent Magnets and their Applications, Bled, Slovenia 21 51 - 54 2010年08月

光で見る磁石（磁性材料）の磁気的微細構造査読有り

竹澤　昌晃

電気学会誌 130 ( 8 ) 544 - 547 2010年08月

Magnetic domain observation of hydrogenation disproportionation desorption recombination processed Nd－Fe－B powder with a high-resolution Kerr microscope using ultraviolet light 査読有り

M. Takezawa,K. Maruko,N. Tani,Y. Morimoto,J. Yamasaki,T. Nishiuchi,S. Hirosawa

Jounal of Applied Physics 107 ( 9 ) 09A724.1 - 09A724.3 2010年04月

Effect of Surface Microstructure on Magnetization Process in Fe80.5Cu1.5Si4B14 Nanocrystalline Alloys 査読有り

M. Ohta,Y. Yoshizawa,M. Takezawa,J. Yamasaki

IEEE Transactions on Magnetics 46 ( 2 ) 203 - 206 2010年01月

Surface Domain Configuration of Nd-Fe-B Sintered Magnets Influenced by Underneath Magnetization 査読有り

M. Takezawa,Y. Ichihara,Y. Morimoto,J. Yamasaki

IEEE Transactions on Magnetics 45 ( 10 ) 4439 - 4442 2009年09月

磁気光学顕微鏡とその応用査読有り

竹澤　昌晃

電気学会論文誌A (基礎・材料・共通部門誌) 129 ( 9 ) 565 - 568 2009年09月

元素戦略プロジェクト「低希土類元素組成高性能異方性ナノコンポジット磁石の開発」の狙いと課題査読有り

広沢哲,西内武司,大久保忠勝,Li Wanfang,宝野和博,山崎二郎,竹澤昌晃,隅山兼治,山室佐益

日本金属学会誌 73 ( 3 ) 135 - 140 2009年03月

Domain Observation of Nd-Fe-B Sintered Magnets by Image Processing Using Liquid Crystal Modulator 査読有り

M. Takezawa,Y. Morimoto,J. Yamasaki

Proceedings of 20th International Workshop on Rare Earth Permanent Magnet & Their Applications 20 327 - 329 2008年09月

無方向性電磁鋼板における磁気特性方向依存性の検討査読有り

開道力,竹澤昌晃,山崎二郎,藤倉昌浩,茂木尚

Journal of the Magnetics Society of Japan 32 ( 3 ) 254 - 259 2008年05月

Magnetic Domains and Magnetization Process of Amorphous Granular (CoFeB)-SiO2 Thin Films 査読有り

M. Takezawa,A. Shiota,Y. Morimoto,J. Yamasaki,M. Munakata,M. Yagi

Jounal of Applied Physics 103 ( 7 ) 07E723.1 - 07E723.1 2008年02月

Domain Observation of Amorphous Wire with Large Diameter for Micro-Sensor and Micro-Motor Application 査読有り

M. Takezawa,T. Wada,Y. Morimoto,J. Yamasaki

International Journal of Applied Electromagnetics and Mechanics 25 ( 1-4 ) 189 - 192 2007年05月

Domain Observation Technique for Nd-Fe-B Magnet in High Magnetic Field by Image Processing Using Liquid Crystal Modulator 査読有り

M. Takezawa,T. Shimada,S. Kondo,S. Mimura,Y. Morimoto,T. Hidaka,J. Yamasaki

Jounal of Applied Physics 101 ( 9 ) 09K106.1 - 09K106.3 2007年05月

Effect of Nd-Rich Phase on c-Axis Orientation of Nd-Fe-B Melt-Spun Magnet and its Domain Structure 査読有り

M. Takezawa,K. Aiba ,H. Yasuda,Y. Morimoto,T. Hidaka,J. Yamasaki ,H. Kato ,M. Yagi

Journal of Magnetism and Magnetic Materials 310 ( 2 ) 2572 - 2574 2007年03月

Effect of Applied Magnetic Field on Anodic Oxidization of Aluminum for High-Aspect-Ratio Microfabrication 査読有り

M. Takezawa,T. Imagawa,J. Yamasaki,M. Yagi

Sensor Letters 5 ( 1 ) 293 - 295 2007年03月

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