Study on the Thermal Stability of Nanomagnets by the Stochastic Cutoff Method

• Project/Area Number: 21740279
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Mathematical physics/Fundamental condensed matter physics
• Research Institution: Tohoku University
• Principal Investigator: SASAKI Munetaka Tohoku University, 大学院・工学研究科, 助教 (80400282)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2009: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 微小磁性体 / 熱的安定性 / 確率的カットオフ法 / 幾何学的閉じ込め磁壁 / モンテカルロ法 / 長距離相互作用系 / アルゴリズム / 統計力学 / ナノ磁性体 / 狭窄磁性体

Research Abstract

I invent an efficient method to estimate the thermal stability of nanomagnets by combining the stochastic cutoff method with the Wang-Landau method. By using the method, I clarify the size-dependence of the thermal stability of spherical nanomagnets which are made of cobalt. This method is also used to reveal the relation between the thermal stability and the thermal magnetoresistance noise of a magnetic wall which is geometrically confined in a magnetic nano-constriction.

Research Products

• [Journal Article] Domain Wall Trap in Magnetic Nanoboards with Uniaxial Anisotropy (2010)
  • Author(s): Masafumi Nakagawa, Nobuo Suzuki, Munetaka Sasaki, Fumitaka Matsubara
  • Journal Title: Journal of the Physical Society of Japan Vol.79
  • NAID: 40017366117
  • Peer Reviewed
• [Journal Article] Reformulation of the Stochastic Potential Switching Algorithm and a Generalized Fourtuin-Kasteleyn Representation (2010)
  • Author(s): Munetaka Sasaki
  • Journal Title: Physical Review E Vol.82
  • Peer Reviewed
• [Journal Article] Microwave Generation on Geometrically Constrained Magnetic Wall : Effect of Twist Angle (2010)
  • Author(s): Katsuyoshi Matsushita, Jun Sato, Hiroshi Imamura, Munetaka Sasaki
  • Journal Title: Journal of the Physical Society of Japan Vol.79
  • NAID: 210000108508
  • Peer Reviewed
• [Journal Article] 幾何学的閉じ込め磁壁の電流誘起動的相 (2010)
  • Author(s): 松下勝義、佐藤純、今村裕志、佐々木志剛
  • Journal Title: Journal of the Magnetics Society of Japan Vol.34 Pages: 323-328
  • NAID: 130000262875
  • Peer Reviewed
• [Journal Article] Thermal stability of geometrically confined domain wall structures (2010)
  • Author(s): Munetaka Sasaki
  • Journal Title: Journal of Physics : Conference Series Vol.200
  • Peer Reviewed
• [Journal Article] Current-induced instability of geometrically confined magnetic wall (2010)
  • Author(s): Katsuyoshi Matsushita, Jun Sato, Hiroshi Imamura, Munetaka Sasaki
  • Journal Title: Journal of Physics : Conference Series 200
  • Peer Reviewed
• [Journal Article] Reformulation of the Stochastic Potential Switching Algorithm and a Generalized Fourtuin-Kasteleyn Representation (2010)
  • Author(s): Munetaka Sasaki
  • Journal Title: Physical Review E Volume: 82
  • Peer Reviewed
• [Journal Article] Microwave Generation on Geometrically Constrained Magnetic Wall : Effect of Twist Angle (2010)
  • Author(s): Katsuyoshi Matsushita
  • Journal Title: Journal of the Physical Society of Japan Volume: 79
  • Peer Reviewed
• [Journal Article] Domain Wall Trap in Magnetic Nanoboards with Uniaxial Anisotropy (2010)
  • Author(s): Masafumi Nakagawa
  • Journal Title: Journal of the Physical Society of Japan Volume: 79
  • Peer Reviewed
• [Journal Article] Thermal stability of geometrically confined domain wall structures (2010)
  • Author(s): Munetaka Sasaki
  • Journal Title: Journal of Physics : Conference Series 200
  • Peer Reviewed
• [Journal Article] Current-induced instability of the geometrically confined magnetic wall (2010)
  • Author(s): Katsuyoshi Matsushita
  • Journal Title: Journal of Physics : Conference Series 200
  • Peer Reviewed
• [Journal Article] 幾何学的閉じ込め磁壁の電流誘起動的相 (2010)
  • Author(s): Katsuyoshi Matsushita
  • Journal Title: Journal of the Magnetics Society of Japan (未定, 印刷中)
  • Peer Reviewed
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性II (2010)
  • Author(s): 佐々木志剛
  • Organizer: 日本磁気学会第34回学術講演会
  • Place of Presentation: つくば
  • Year and Date: 2010-09-07
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性II (2010)
  • Author(s): 佐々木志剛
  • Organizer: 日本磁気学会 第34回学術講演会
  • Place of Presentation: つくば
  • Year and Date: 2010-09-07
• [Presentation] Stochastic Cutoff Method for Long-Range Interacting Systems (2010)
  • Author(s): Munetaka Sasaki
  • Organizer: Satellite conference of Statphys 24 "Monte Carlo Algorithm in Statistical Physics"
  • Place of Presentation: Melbourne (Australia)
  • Year and Date: 2010-07-27
• [Presentation] Stochastic Cutoff Method for Long-Range Interacting Systems (2010)
  • Author(s): Munetaka Sasaki
  • Organizer: Satellite conference of Statphys 24 "Monte Carlo Algorithm in Statistical Physics"
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2010-07-27
• [Presentation] An Efficient Monte-Carlo Method to Calculate Free-Energy in Long-Range Interacting Systems (2010)
  • Author(s): Kazuya Watanabe
  • Organizer: Statphys 24
  • Place of Presentation: Cairns (Australia)
  • Year and Date: 2010-07-19
• [Presentation] An Efficient Monte-Carlo Method to Calculate Free-Energy in Long-Range Interacting Systems (2010)
  • Author(s): Kazuya Watanabe
  • Organizer: Statphys 24
  • Place of Presentation: Cairns, Australia
  • Year and Date: 2010-07-19
• [Presentation] 電流誘起磁気構造の磁場による不安定化 (2010)
  • Author(s): 松下勝義
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山
  • Year and Date: 2010-03-20
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性II (2010)
  • Author(s): 佐々木志剛
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山
  • Year and Date: 2010-03-20
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性II (2010)
  • Author(s): 佐々木志剛
  • Organizer: 日本物理学会 第65回年次大会
  • Place of Presentation: 岡山
  • Year and Date: 2010-03-20
• [Presentation] 電流誘起磁気構造の磁場による不安定化 (2010)
  • Author(s): 松下勝義
  • Organizer: 日本物理学会 第65回年次大会
  • Place of Presentation: 岡山
  • Year and Date: 2010-03-20
• [Presentation] 幾何学的閉じ込め磁壁の運動における外部磁場の効果 (2009)
  • Author(s): 松下勝義
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本
  • Year and Date: 2009-09-27
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性 (2009)
  • Author(s): 佐々木志剛
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本
  • Year and Date: 2009-09-27
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性 (2009)
  • Author(s): 佐々木志剛
  • Organizer: 日本物理学会 2009年秋季大会
  • Place of Presentation: 熊本
  • Year and Date: 2009-09-27
• [Presentation] 幾何学的閉じ込め磁壁の運動における外部磁場の効果 (2009)
  • Author(s): 松下勝義
  • Organizer: 日本物理学会 2009年秋季大会
  • Place of Presentation: 熊本
  • Year and Date: 2009-09-27
• [Presentation] ナノサイズ磁性体における単磁区構造の熱的安定性 (2009)
  • Author(s): 渡部司也
  • Organizer: 日本磁気学会第33回学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-13
• [Presentation] ナノサイズ磁性体における単磁区構造の熱的安定性 (2009)
  • Author(s): 渡部司也
  • Organizer: 日本磁気学会 第33回学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-13
• [Presentation] 幾何学的閉じ込め磁壁の電流誘起不安定性 (2009)
  • Author(s): 松下勝義
  • Organizer: 日本磁気学会第33回学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-12
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性 (2009)
  • Author(s): 佐々木志剛
  • Organizer: 日本磁気学会第33回学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-12
• [Presentation] 幾何学的閉じ込め磁壁の熱的安定性 (2009)
  • Author(s): 佐々木志剛
  • Organizer: 日本磁気学会 第33回学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-12
• [Presentation] 幾何学的閉じ込め磁壁の電流誘起不安定性 (2009)
  • Author(s): 松下勝義
  • Organizer: 日本磁気学会 第33回学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-12