High-resolution and dynamic domain observation in demagnetization process at elevated temperature using UV Kerr microscope

• Project/Area Number: 23560402
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: TAKEZAWA Masaaki 九州工業大学, 工学(系)研究科(研究院), 准教授 (20312671)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 電子デバイス・電子機器 / 磁区観察 / 磁区構造 / 磁気Kerr効果 / ハード磁性材料 / 磁化反転 / 磁化過程 / 磁気異方性 / Kerr効果 / 熱アシスト磁化反転

Research Abstract

Magnetization reversal were clearly observed with a high-resolution and dynamic domain observation system using Kerr microscope in order to analyze the mechanism of magnetization reversal in high-anisotropic magnetic materials at elevated temperatures. It was found that nanometer-sized domain patterns could be observed with the UV Kerr microscope with a wavelength of 248 nm. The coercivity of the magnetic materials depends on the volume of magnetically coupled grains that simultaneously reverse their magnetization. We found that simultaneous magnetization reversal in several grains occurred at elevated temperatures, and the extent of simultaneous magnetization reversal increases with temperature.

Research Products

• [Journal Article] Analysis of Magnetization Reversal Process of Nd-Fe-B Sintered Magnets by Magnetic Domain Observation Using Kerr Microscope (2013)
  • Author(s): M. Takezawa, Y. Kimura, Y. Morimoto ,J. Yamasaki
  • Journal Title: IEEE Trans. Magn. Volume: Vol.49 Issue: 7 Pages: 3262-3264
  • DOI: 10.1109/tmag.2013.2241748
  • Peer Reviewed
• [Journal Article] Easy Axis Orientation of Nd-Fe-B Melt-spun Magnets Caused by Hot-rolling (2012)
  • Author(s): M. Takezawa, T. Mihara, Y. Morimoto, J. Yamasaki, M. Yagi
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 132 Issue: 10 Pages: 818-821
  • DOI: 10.1541/ieejfms.132.818
  • NAID: 10031120036
  • ISSN: 0385-4205, 1347-5533
  • Peer Reviewed
• [Journal Article] Investigation of Easy Axis Orientation of Nd-Fe-B Melt-Spun Ribbons Produced by hot Rolling and Influence of Ti-C Addition (2012)
  • Author(s): M. Takezawa, Y. Nakanishi, Y. Morimoto, J. Yamasaki, M. Yagi
  • Journal Title: J. Appl. Phys. Volume: Vol.111 Issue: 7
  • DOI: 10.1063/1.3670976
  • Peer Reviewed
• [Journal Article] Magnetic Domain Observation of Nd-Cu-Diffused Nd-Fe-B Magnets with Submicron Grains by Kerr Effect Microscopy (2012)
  • Author(s): M. Takezawa, Y. Nagashima, Y. Kimura, Y. Morimoto, J. Yamasaki, N. Nozawa, T. Nishiuchi,S . Hirosawa
  • Journal Title: J. Appl. Phys. Volume: Vol.111 Issue: 7
  • DOI: 10.1063/1.3675157
  • Peer Reviewed
• [Journal Article] Magnetic Domain Observation and Magnetization Process Analysis of Nd-Fe-B Sub-Micron Grain Sized Magnet with High-Resolution Kerr Microscope (2012)
  • Author(s): M. Takezawa
  • Journal Title: J. Japan Inst. Metals Volume: Vol.76 Pages: 48-51
  • NAID: 10030260466
  • URL: http://http://www.jim.or.jp/journal/j/76/01/48-51.html
  • Peer Reviewed
• [Journal Article] Investigation of Easy Axis Orientation of Nd-Fe-B Melt-Spun Ribbons Produced by hot Rolling and Influence of Ti-C Addition (2012)
  • Author(s): M. Takezawa, Y. Nakanishi, Y. Morimoto, J. Yamasaki and M. Yagi
  • Journal Title: J. Appl. Phys. Volume: 111
  • Peer Reviewed
• [Journal Article] Magnetic Domain Observation of Nd-Cu-Diffused Nd-Fe-B Magnets with Submicron Grains by Kerr Effect Microscopy (2012)
  • Author(s): M. Takezawa, Y. Nagashima, Y. Kimura, Y. Morimoto, J. Yamasaki, N. Nozawa, T. Nishiuchi and S. Hirosawa
  • Journal Title: J. Appl. Phys. Volume: 111
  • Peer Reviewed
• [Journal Article] Magnetic Domain Observation of Nd-Fe-B Sintered Magnets at Elevated Temperatures by Using Kerr Microscope (2011)
  • Author(s): M. Takezawa, Y. Nagashima, Y. Morimoto, J. Yamasaki
  • Journal Title: IEEE Trans. Magn. Volume: Vol.47 Issue: 10 Pages: 3256-3258
  • DOI: 10.1109/tmag.2011.2154316
  • Peer Reviewed
• [Journal Article] Magnetic Domain Observation of Nd-Fe-B Sintered Magnets at Elevated Temperatures by Using Kerr Microscope (2011)
  • Author(s): M. Takezawa, Y. Nagashima, Y. Morimoto and J. Yamasaki
  • Journal Title: IEEE Trans. Magn. Volume: 47 Pages: 3256-3258
  • Peer Reviewed
• [Presentation] Nd-Fe-B系焼結磁石における残留応力と磁区構造の関係 (2014)
  • Author(s): 江島潤, 森本祐治, 竹澤昌晃, 中野善和, 荒木健
  • Organizer: 平成26年度電気学会全国大会
  • Place of Presentation: 愛媛大学(2-143)
• [Presentation] Nd-Fe-B系焼結磁石における残留応力と磁区構造の関係 (2014)
  • Author(s): 江島 潤, 森本 祐治, 竹澤 昌晃, 中野 善和, 荒木 健
  • Organizer: 平成26年度 電気学会全国大会
  • Place of Presentation: 愛媛大学
• [Presentation] 磁区観察を用いたNd-Fe-B系焼結磁石の高温中における減磁過程の検討 (2013)
  • Author(s): 荻本紘史, 木村祐弥, 森本祐治, 竹澤昌晃:
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 東京(MAG-13-109)
  • Year and Date: 2013-12-02
• [Presentation] Nd-Fe-B系磁石の磁区観察のための高分解能磁気Kerr効果顕微鏡の開発 (2013)
  • Author(s): 竹澤昌晃, 木村祐弥, 永島優樹, 森本祐治, 山崎二郎
  • Organizer: 日本磁気学会第52回ナノマグネティクス専門研究会
  • Place of Presentation: 中央大学駿河台記念館
  • Year and Date: 2013-05-31
• [Presentation] Analysis of Demagnetization Process of Nd−Fe−B Sintered Mag- nets at Elevated Temperatures by Magnetic Domain Observation Using Kerr Microscope (2013)
  • Author(s): M. Takezawa, H. Ogimoto, Y. Kimura, Y. Morimoto
  • Organizer: 58th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Denver, Colorad, USA(AV-02)
• [Presentation] Influence of Microstructure on Magnetic Domain Propagation in Nd-Fe-B Sintered Magnet Analyzed by SEM/EBSD and in-situ Kerr Microscope (2013)
  • Author(s): T. Maki, M. Natsumeda, T. Nishiuchi, M. Takezawa
  • Organizer: 58th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Denver, Colorad, USA(FF-03)
• [Presentation] Nd-Fe-B系焼結磁石における残留応力と磁区構造の関係 (2013)
  • Author(s): 江島潤, 長澤佑紀, 森本祐治, 竹澤昌晃
  • Organizer: 平成25年度電気関係学会九州支部連合大会
  • Place of Presentation: 熊本大学(09-2A-07)
• [Presentation] Nd-Fe-B系焼結磁石の高温中における減磁過程の磁区観察 (2013)
  • Author(s): 荻本紘史, 木村祐弥, 森本祐治, 竹澤昌晃
  • Organizer: 第37回日本磁気学会学術講演会
  • Place of Presentation: 北海道大学(4aB-5)
• [Presentation] 異方性Nd-Fe-B系急冷薄帯磁石の磁区構造と磁化過程 (2013)
  • Author(s): 種子田大幸, 中西勇太, 森本祐治, 竹澤昌晃
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 大同大(MAG-13-077)
• [Presentation] Nd-Fe-B系焼結磁石の高温中減磁過程の磁区観察 (2013)
  • Author(s): 荻本紘史, 木村祐弥, 森本祐治, 竹澤昌晃:
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 松島(MAG-13-052)
• [Presentation] Analysis of Demagnetization Process of Nd－Fe－B Sintered Mag- nets at Elevated Temperatures by Magnetic Domain Observation Using Kerr Microscope (2013)
  • Author(s): M. Takezawa, H. Ogimoto, Y. Kimura and Y. Morimoto
  • Organizer: 58th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Denver, Colorad, USA
• [Presentation] Influence of Microstructure on Magnetic Domain Propagation in Nd-Fe-B Sintered Magnet Analyzed by SEM/EBSD and in-situ Kerr Microscope (2013)
  • Author(s): T. Maki, M. Natsumeda, T. Nishiuchi and M. Takezawa
  • Organizer: 58th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Denver, Colorad, USA
• [Presentation] Nd-Fe-B系焼結磁石における残留応力と磁区構造の関係 (2013)
  • Author(s): 江島 潤, 長澤 佑紀, 森本 祐治, 竹澤 昌晃
  • Organizer: 平成25年度 電気関係学会九州支部連合大会
  • Place of Presentation: 熊本大学
• [Presentation] アモルファス磁性薄帯を用いたフラックスゲート磁気センサの周波数特性と磁芯の磁区構造の関係 (2013)
  • Author(s): 宮田 大史, 山本 竜馬, 森本 祐治, 竹澤 昌晃
  • Organizer: 平成25年度 電気関係学会九州支部連合大会
  • Place of Presentation: 熊本大学
• [Presentation] 析出物を有する電磁鋼板の磁区観察 (2013)
  • Author(s): 益田 准希, 八坂 千遥, 森本 祐治, 竹澤 昌晃
  • Organizer: 平成25年度 電気関係学会九州支部連合大会
  • Place of Presentation: 熊本大学
• [Presentation] アモルファス磁性薄帯を用いたフラックスゲート磁気センサのセンサ出力と磁芯の磁区構造の関係 (2013)
  • Author(s): 宮田 大史, 森本 祐治, 竹澤 昌晃
  • Organizer: 第37回日本磁気学会学術講演会
  • Place of Presentation: 北海道大学
• [Presentation] Nd-Fe-B 系焼結磁石の高温中における減磁過程の磁区観察 (2013)
  • Author(s): 荻本 紘史, 木村 祐弥, 森本 祐治, 竹澤 昌晃
  • Organizer: 第37回日本磁気学会学術講演会
  • Place of Presentation: 北海道大学
• [Presentation] 異方性 Nd-Fe-B 系急冷薄帯磁石の磁区構造と磁化過程 (2013)
  • Author(s): 種子田 大幸, 中西 勇太, 森本 祐治, 竹澤 昌晃
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 大同大学
• [Presentation] Nd-Fe-B系焼結磁石の高温中減磁過程の磁区観察 (2013)
  • Author(s): 荻本 紘史, 木村 祐弥, 森本 祐治, 竹澤 昌晃
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 松島
• [Presentation] Analysis of Magnetization Reversal Process of Nd－Fe－B Sintered Magnets by Magnetic Domain Observation Using Kerr Microscope (2013)
  • Author(s): M. Takezawa, Y. Kimura, Y. Morimoto and J. Yamasaki
  • Organizer: The 12th Joint MMM/Intermag Conference
  • Place of Presentation: Chicago, Illinois, USA
• [Presentation] Analysis of Demagnetization Process of Nd-Fe-B Permanent Magnets by Domain Observation Using Kerr Microscope (2012)
  • Author(s): Masaaki Takezawa and Yuya Kimura and Yuji Morimoto and Jiro Yamasaki
  • Organizer: 2012 ENERGY MATERIALS NANOTECHNOLOGY (EMN FALL)
  • Place of Presentation: Las Vegas, USA
  • Invited
• [Presentation] Analysis of Magnetization Process of Nd-Fe-B Sintered Magnets by Magnetic Domain Observation Using Kerr Microscope (2012)
  • Author(s): Y. Kimura and M. Takezawa and Y. Morimoto and J. Yamasaki
  • Organizer: ICAUMS 2012 (The 2nd International Conference of AUMS & The 36th Annual Conference on Magnetics in Japan)
  • Place of Presentation: Nara, JAPAN
• [Presentation] Nd-Fe-B 系急冷薄帯磁石の圧延による異方性化 (2012)
  • Author(s): 種子田 大幸, 中西 勇太, 竹澤 昌晃, 森本 祐治, 山崎 二郎, 八木 正昭
  • Organizer: 平成24年度 電気関係学会九州支部連合大会
  • Place of Presentation: 長崎大学
• [Presentation] Analysis of Magnetization Process of Hydrogenation-Disproportionation-Desorption-Recombination-Processed Nd-Fe-B Magnets by Magnetic Domain Observation Using A Kerr Microscope (2012)
  • Author(s): M. Takezawa, T. Nakamura, Y. Kimura, Y. Nagashima, Y. Morimoto, J. Yamasaki, N. Nozawa, T. Nishiuchi and S. Hirosawa
  • Organizer: The 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications (REPM‘12)
  • Place of Presentation: Nagasaki, JAPAN
• [Presentation] Nd-Fe-B焼結磁石の磁区観察による磁化過程解析 (2012)
  • Author(s): 木村 祐弥, 竹澤 昌晃, 森本 祐治, 山崎 二郎
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: サン・リフレ函館
• [Presentation] Magnetic Domain Observation of Nd-Fe-B Permanent Magnets with A High-Resolution Kerr Microscope Using Ultraviolet Light (2012)
  • Author(s): M. Takezawa, Y. Morimoto and J. Yamasaki
  • Organizer: 2012 Collaborative Conference on Materials Research (CCMR)
  • Place of Presentation: Seoul, KOREA
  • Invited
• [Presentation] 圧延によるNd-Fe-B系急冷薄帯磁石の異方性化 (2012)
  • Author(s): 種子田 大幸, 中西 勇太, 竹澤 昌晃, 森本 祐治, 山崎 二郎, 八木 正昭
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 信州大学
• [Presentation] Nd-Fe-B微細結晶粒磁石の磁区観察のための高分解能Kerr効果顕微鏡の開発 (2011)
  • Author(s): 木村 祐弥, 永島 優樹, 竹澤 昌晃, 森本 祐治, 山崎 二郎, 野澤 宣介, 西内 武司, 広沢 哲
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 日本電気計器検定所
• [Presentation] Magnetic Domain Observation of Nd-Cu Diffusion Nd-Fe-B sub- Micron Grain Sized Magnet by Kerr Effect Microscopy (2011)
  • Author(s): M. Takezawa, Y. Nagashima, Y. Kimura, Y. Morimoto, J. Yamasaki, N. Nozawa, T. Nishiuchi and S. Hirosawa
  • Organizer: 56th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Scottsdale
• [Presentation] Investigation of Easy Axis Orientation of Nd-Fe-B Melt-Spun rib- Bons Produced by hot Rolling and Influence of Ti-C Addition (2011)
  • Author(s): Y. Nakanishi, M. Takezawa, Y. Morimoto, J. Yamasaki and M. Yagi
  • Organizer: 56th Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Scottsdale
• [Presentation] Nd-Fe-B系急冷薄帯磁石のTi、Ｃ添加による異方性への影響 (2011)
  • Author(s): 中西 勇太, 竹澤 昌晃, 森本 祐治, 山崎 二郎, 八木 正昭
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟
• [Presentation] トロイダル形状アモルファス磁性薄帯のストロボ法による動磁区観察 (2011)
  • Author(s): 坂屋 啓祐, 竹澤 昌晃, 森本 祐治, 山崎 二郎
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟
• [Presentation] Nd-Cuを拡散させたNd-Fe-B系微細結晶粒磁石のKerr効果顕微鏡による磁区観察 (2011)
  • Author(s): 永島 優樹, 木村 祐弥, 竹澤 昌晃, 森本 祐治, 山崎 二郎, 野澤 宣介, 西内 武司, 広沢 哲
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 新潟
• [Presentation] 高磁界印加可能なKerr効果顕微鏡によるNd-Fe-B系磁石の高分解能磁区観察 (2011)
  • Author(s): 竹澤 昌晃, 谷 奈緒美, 永島 優樹, 森本 祐治, 山崎 二郎, 野澤 宣介, 西内 武司, 広沢 哲
  • Organizer: 平成23年 電気学会 基礎・材料・共通部門大会
  • Place of Presentation: 東京工業大学
• [Presentation] Dynamic Observation of Magnetic Domains of Hydrogenation Disproportionation Desorption Recombination (HDDR)-Processed Nd-Fe-B Magnets Compacted by hot Pressing with a High-Resolution Kerr Microscope Using Ultraviolet Light (2011)
  • Author(s): M. Takezawa, N. Tani, Y. Nagashima, Y. Morimoto, J. Yamasaki, N. Nozawa, T. Nishiuchi and S. Hirosawa
  • Organizer: European Congress and Exhibition on Advanced Materials and Processes (EUROMAT) 2011
  • Place of Presentation: Montpellier, France
• [Presentation] Ti、Ｃ添加によるNd-Fe-B系急冷薄帯磁石の異方性化 (2011)
  • Author(s): 中西 勇太, 竹澤 昌晃, 森本 祐治, 山崎 二郎, 八木 正昭
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 高知
• [Presentation] Influence of Compressive Stress Applied Along the Normal Direction on the Magnetic Domain Structure of Oriented Si-Fe Electrical Sheets (2011)
  • Author(s): M. Takezawa, M. Tokushige, Y. Morimoto and J. Yamasaki
  • Organizer: 2011 IEEE International Magnetics Conference
  • Place of Presentation: Taipei
• [Presentation] Magnetic Domain Observation of Nd-Fe-B Sintered Magnets at Elevated Temperatures by Using Kerr Microscope (2011)
  • Author(s): M. Takezawa, Y. Nagashima, Y. Morimoto and J. Yamasaki
  • Organizer: 2011 IEEE International Magnetics Conference
  • Place of Presentation: Taipei
• [Presentation] Nd-Fe-B系永久磁石の高温中磁区観察 (2010)
  • Author(s): 木村 祐弥, 永島 優樹, 竹澤 昌晃, 森本 祐治, 山崎 二郎
  • Organizer: 平成23年度 電気関係学会九州支部連合大会
  • Place of Presentation: 佐賀大学
• [Presentation] 磁区観察を用いたNd-Fe-B系焼結磁石の高温中における減磁過程の検討
  • Author(s): 荻本 紘史, 木村 祐弥, 森本 祐治, 竹澤 昌晃
  • Organizer: 電気学会マグネティックス研究会
  • Place of Presentation: 日本電気検定所、東京
• [Presentation] Nd-Fe-B系磁石の磁区観察のための高分解能磁気Kerr効果顕微鏡の開発
  • Author(s): 竹澤 昌晃, 木村 祐弥, 永島 優樹, 森本祐治, 山崎 二郎
  • Organizer: 日本磁気学会 第52回ナノマグネティクス専門研究会
  • Place of Presentation: 中央大学駿河台記念館
• [Remarks]
  • URL: http://www.kyutech.ac.jp/professors/tobata/t7/t7-3/entry-633.html
• [Remarks]
  • URL: http://www.tobata.kyutech.ac.jp/professor/takezawa_masaaki
• [Remarks] 九州工業大学の研究者 -私たちはこんな研究をしています-
  • URL: http://www.kyutech.ac.jp/professors/tobata/t7/t7-3/entry-633.html
• [Remarks] 九州工業大学 研究者情報：竹澤昌晃
  • URL: https://research02.jimu.kyutech.ac.jp/html/170_ja.html
• [Remarks] 九州工業大学 研究者詳細 | 竹澤 昌晃
  • URL: https://research02.jimu.kyutech.ac.jp/html/170_ja.html