Masamichi Nishino

J-GLOBAL         Last updated: Dec 14, 2019 at 23:44
 
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Name
Masamichi Nishino
E-mail
NISHINO.Masamichinims.go.jp
Affiliation
National Institute for Materials Science
Research funding number
80391217

Research Areas

 
 

Published Papers

 
Masamichi Nishino, Cristian Enachescu, Seiji Miyashita
Physical Review B   100    Oct 2019
© 2019 American Physical Society. We investigate the phase diagram of an elastic interaction model for spin crossover (SC) materials on a triangular lattice, in which the long-range (LR) interaction of elastic origin, antiferromagnetic-like neares...
Hisato Komatsu, Yoshihiko Nonomura, Masamichi Nishino
Physical Review B   100    Sep 2019
© 2019 American Physical Society. We investigate phase transitions in the two-dimensional dipolar Heisenberg model with uniaxial anisotropy with a specific ratio between the exchange and dipolar constants, δ=1. We obtain the η-T (anisotropy vs tem...
Masamichi Nishino, Seiji Miyashita
Physical Review B   100    Jul 2019
© 2019 American Physical Society. We find unusual temperature dependence of the ferromagnetic resonance (FMR) frequency fR for the spin-reorientation (SR) transition, in which the easy axis changes depending on temperature, observed in the Nd perm...
Hisato Komatsu, Yoshihiko Nonomura, Masamichi Nishino
Physical Review E   98    Dec 2018
© 2018 American Physical Society. We study field-induced phase transitions in the two-dimensional dipolar Ising ferromagnet with a specific ratio between the exchange and dipolar constants, δ=1, which exhibits a stripe-ordered phase with the width...
Masamichi Nishino, Per Arne Rikvold, Conor Omand, Seiji Miyashita
Physical Review B   98    Oct 2018
© 2018 American Physical Society. The interplay between competing short-range (SR) and long-range (LR) interactions can cause nontrivial structures in phase diagrams. Recently, horn-shaped unusual structures were found by Monte Carlo simulations i...
Seiji Miyashita, Masamichi Nishino, Yuta Toga, Taichi Hinokihara, Takashi Miyake, Satoshi Hirosawa, Akimasa Sakuma
Scripta Materialia   154 259-265   Sep 2018
© 2017 Acta Materialia Inc. The thermal and dynamical properties Nd2Fe14B at finite temperatures are studied with an atomic model Hamiltonian. The temperature dependence of the magnetization including the reorientation transition was obtained succ...
Yuta Toga, Masamichi Nishino, Seiji Miyashita, Takashi Miyake, Akimasa Sakuma
Physical Review B   98    Aug 2018
© 2018 American Physical Society. We examine the anisotropic properties of the exchange stiffness constant A for a rare-earth permanent magnet, Nd2Fe14B, by connecting analyses with two different scales of length, i.e., Monte Carlo (MC) method wit...
Taichi Hinokihara, Masamichi Nishino, Yuta Toga, Seiji Miyashita
Physical Review B   97    Mar 2018
© 2018 American Physical Society. We developed an efficient method for Monte Carlo simulations with long-range interacting systems. The present method is based on the stochastic potential switching algorithm as in the case of the stochastic cutoff...
Masamichi Nishino, Seiji Miyashita, Per Arne Rikvold
Physical Review B   96    Oct 2017
© 2017 American Physical Society. We study the phase diagram of an elastic interaction model for spin crossover (SC) materials with antiferromagnetic-like short-range interactions. In this model, the interplay between the short-range interaction a...
Laurentiu Stoleriu, Masamichi Nishino, Seiji Miyashita, Alexandru Stancu, Andreas Hauser, Cristian Enachescu
Physical Review B   96    Aug 2017
© 2017 American Physical Society. The nucleation and growth properties of domains of molecules of the same state in open boundary three-dimensional (3D) spin-crossover systems of various shapes are discussed within the framework of the mechanoelas...
Cristian Enachescu, Laurentiu Stoleriu, Masamichi Nishino, Seiji Miyashita, Alexandru Stancu, Maciej Lorenc, Roman Bertoni, Hervé Cailleau, Eric Collet
Physical Review B   95    Jun 2017
© 2017 American Physical Society. In this paper, we use an elastic model in order to study the elastically driven cooperative switching of spin-crossover materials after femtosecond laser excitation. In this model, the molecules occupy a triangula...
Masamichi Nishino, Yuta Toga, Seiji Miyashita, Hisazumi Akai, Akimasa Sakuma, Satoshi Hirosawa
Physical Review B   95    Mar 2017
© 2017 American Physical Society. We studied the properties of domain walls (DWs) of the Neodymium magnet, Nd2Fe14B. Applying an atomistic model, in which the magnetic moments of all atoms and exchange interactions were determined by a first-princ...
Satoshi Hirosawa, Masamichi Nishino, Seiji Miyashita
Advances in Natural Sciences: Nanoscience and Nanotechnology   8    Mar 2017
© 2017 Vietnam Academy of Science & Technology. High-performance permanent magnets are indispensable in the production of high-efficiency motors and generators and ultimately for sustaining the green earth. The central issue of modern permanent ...
Masamichi Nishino, Seiji Miyashita
Physical Review B   94    Nov 2016
© 2016 American Physical Society. The effect of long-range (LR) interactions on frustrated-spin models is an interesting problem, which provides rich ordering processes. We study the effect of LR interactions on triangular Ising antiferromagnets w...
Sasmita Mohakud, Sergio Andraus, Masamichi Nishino, Akimasa Sakuma, Seiji Miyashita
Physical Review B   94    Aug 2016
© 2016 American Physical Society. In order to study the dependence of the coercive force of sintered magnets on temperature, nucleation and domain wall propagation at the grain boundary are studied as rate-determining processes of the magnetizatio...
Per Arne Rikvold, Gregory Brown, Seiji Miyashita, Conor Omand, Masamichi Nishino
Physical Review B   93    Feb 2016
© 2016 American Physical Society. Phase diagrams and hysteresis loops were obtained by Monte Carlo simulations and a mean-field method for a simplified model of a spin-crossover material with a two-step transition between the high-spin and low-spi...
Hiroshi Watanabe, Koichiro Tanaka, Nicolas Bréfuel, Hervé Cailleau, Jean François Létard, Sylvain Ravy, Pierre Fertey, Masamichi Nishino, Seiji Miyashita, Eric Collet
Physical Review B   93    Jan 2016
© 2016 American Physical Society. We study the complex spin-state switching mechanism in a bistable molecular crystal undergoing a stepwise conversion from high-spin to low-spin states at thermal equilibrium as well as during the relaxation proces...
Masamichi Nishino, Seiji Miyashita
Physical Review B - Condensed Matter and Materials Physics   92    Nov 2015
© 2015 American Physical Society. Two-dimensional systems with U(1) symmetry exhibit a peculiar phase, i.e., the Berezinskii-Kosterlitz-Thouless (BKT) phase. In particular situations, the BKT phase exists as an intermediate-temperature phase. Ther...
Masamichi Nishino, Seiji Miyashita
Physical Review B - Condensed Matter and Materials Physics   91    Apr 2015
© 2015 American Physical Society. It is crucially important to investigate the effects of temperature on magnetic properties such as critical phenomena, nucleation, pinning, domain wall motion, and coercivity. The Landau-Lifshitz-Gilbert (LLG) equ...
Cristian Enachescu, Masamichi Nishino, Seiji Miyashita, Kamel Boukheddaden, François Varret, Per Arne Rikvold
Physical Review B - Condensed Matter and Materials Physics   91    Mar 2015
© 2015 American Physical Society. In this paper we study the growth properties of domains of low-spin molecules in a high-spin background in open-boundary elliptically shaped spin-crossover systems within the framework of a mechanoelastic model. T...

Misc

 
Nishino Masamichi, Miyashita Seiji
Butsuri   57(10) 728-737   2002
Photoinduced phase transitions (PIPT) have currently attracted interest because they may offer the possibility to build optical memory devices etc. The dynamical properties of PIPT are also important from the viewpoint of the analysis of relaxatio...
大西 弘明, 西野 正理, 宮下 精二
物性研究   72(6) 791-793   Sep 1999
この論文は国立情報学研究所の電子図書館事業により電子化されました。

Conference Activities & Talks

 
小松尚登, 西野正理, 野々村禎彦
日本物理学会講演概要集(CD-ROM)   22 Mar 2019   
西野正理, RIKVOLD P. A., OMAND Conor, 宮下精二
日本物理学会講演概要集(CD-ROM)   22 Mar 2019   
小松尚登, 西野正理, 野々村禎彦
日本物理学会講演概要集(CD-ROM)   21 Sep 2018   
檜原太一, 檜原太一, 西野正理, 西野正理, 栂裕太, 栂裕太, 宮下精二, 宮下精二
日本物理学会講演概要集(CD-ROM)   21 Sep 2018   
西野正理, 宮下精二
日本磁気学会学術講演概要集   28 Aug 2018   
Komatsu Hisato, Nishino Masamichi, Nonomura Yoshihiko
Meeting Abstracts of the Physical Society of Japan   23 Mar 2018   
Hinokihara Taichi, Nishino Masamichi, Toga Yuta, Miyashita Seiji
Meeting Abstracts of the Physical Society of Japan   23 Mar 2018   
Nishino Masamichi, Miyashita Seiji
Meeting Abstracts of the Physical Society of Japan   23 Mar 2018   
Hinokihara Taichi, Nishino Masamichi, Toga Yuta, Miyashita Seiji
Meeting Abstracts of the Physical Society of Japan   2017   
<p>近年,確率的カットオフ法などの理論研究によって,長距離相互作用をモンテカルロ法で取り扱う際に,現実的な計算時間で解析することが可能になってきた.本講演ではこの手法を用いることで,双極子相互作用が磁化反転機構や反磁場効果に及ぼす影響について議論する.特に,従来考えられてきた反磁場係数は,連続磁化模型の平均場近似による結果であり,モンテカルロ計算では,連続磁化模型・局在スピン模型のどちらも教科書的な反磁場係数を再現しないことを明らかにした.</p>
Nishino Masamichi, Hinokihara Taichi, Miyashita Seiji
Meeting Abstracts of the Physical Society of Japan   25 Sep 2017   
Hinokihara Taichi, Nishino Masamichi, Toga Yuta, Miyashita Seiji
Meeting Abstracts of the Physical Society of Japan   25 Sep 2017   
Nishino Masamichi, Miyashita Seiji, Rikvold Per Arne
Meeting Abstracts of the Physical Society of Japan   2017   
<p>反強磁性短距離相互作用とHusimi-Temperley型長距離相互作用の競合により、新奇な相図が現われる事を示す。その新奇な構造は、両者の揺らぎの性質の違いによるものであるが、その出現機構の詳細について考察する。この2種類の相互作用をもつモデルは2段階スピンクロスオーバー転移の弾性相互作用モデルの近似モデルになることから、スピンクロスオーバー転移との関係についても考察する。</p>
Nishino Masamichi, Miyashita Seiji, Rikvold Per Arne
Meeting Abstracts of the Physical Society of Japan   2016   
<p>ユニット分子の大きさと電子状態が結合して双安定性を持つスピンクロスオーバー系においては、格子歪みに由来する弾性相互作用が協力現象に重要な役割を果たしていることが明らかになっている。本講演では、2-step転移を示すモデルである弾性相互作用と反強磁性的短距離相互作用による競合における揺らぎの効果について考察する。長距離力が比較的強い場合に、その揺らぎの効果により相図に非自明な構造が現われる事を示す。</p>
Andraus S., Nishino M., Miyashita S.
Meeting Abstracts of the Physical Society of Japan   2016   
Sakai O., Suzuki T., Nishino M.
Meeting Abstracts of the Physical Society of Japan   2016   
Nishino M., Miyashita S.
Meeting Abstracts of the Physical Society of Japan   2015   
Sakai O., Suzuki T., Nishino M.
Meeting Abstracts of the Physical Society of Japan   2015   
Nishino M., Miyashita S.
Meeting Abstracts of the Physical Society of Japan   2015   
Sakai O., Suzuki T., Nishino M.
Meeting Abstracts of the Physical Society of Japan   2015