Phase-field simulation of magnetic hysteresis and mechanically induced remanent magnetization rotation in Ni-Mn-Ga ferromagnetic shape memory alloy

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• 作者：Qi Peng^a ; ^b ; Junjie Huang^a ; ^{jnjhuang@whu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Mingxiang Chen^a ; Qingping Sun^a ; ^b
• 关键词：Ferromagnetic shape memory alloy ; Phase-field model ; Martensitic phase transformation ; Magnetic domain ; Coercivity
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：127
• 期：Complete
• 页码：49-53
• 全文大小：1876 K

文摘

The magnetic hysteresis/coercivity in Ni-Mn-Ga is quantified in the phase-field model by introducing a Magnetic Resistant Field (MRF) into the magnetic kinetic equation. Then microstructural processes of Mechanically-Induced Demagnetization (MID) and Magnetically/Mechanically-Induced Remanent Magnetization Rotation (MaIR/MeIR) are simulated. It is found that MID is a special case of MeIR, in which the remanent magnetization decreases significantly after its rotation. The remanent magnetization magnitude after MeIR will always be the smaller one of the initial remanent magnetization and the retentivity of ending martensitic variant. An analytical criterion determining remanent magnetization after MeIR under arbitrary demagnetization factors is proposed for potential applications.