| Evolution of magnetic domain structure of martensite in Ni–Mn–Ga films under the interplay of the temperature and magnetic field |
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| 引用本文： | 谢忍,韦俊,刘仲武,唐妍梅,唐涛,唐少龙,都有为. Evolution of magnetic domain structure of martensite in Ni–Mn–Ga films under the interplay of the temperature and magnetic field[J]. 中国物理 B, 2014, 0(6): 574-579 |
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| 作者姓名： | 谢忍 韦俊 刘仲武 唐妍梅 唐涛 唐少龙 都有为 |
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| 基金项目： | supported by the National Key Project of Fundamental Research of China(Grant No.2012CB932304);the National Natural Science Foundation of China(Grant No.50831006);the Program for New Century Excellent Talents in University(Grant No.NCET-11-0156);the Priority Academic Program Development of Jiangsu Higher Education Institutions |
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| 摘 要： | Ferromagnetic shape memory Ni-Mn-Ga films with 7M modulated structure were prepared on MgO （001） substrates by magnetron sputtering. Magnetization process with a typical two-hysteresis loop indicates the occurrence of the reversible magnetic field-induced reorientation. Magnetic domain structure and twin structure of the film were controlled by the in- terplay of the magnetic and temperature field. With cooling under an out-of-plane magnetic field, the evolution of magnetic domain structure reveals that martensitic transformation could be divided into two periods： nucleation and growth. With an in-plane magnetic field applied to a thermomagnetic-treated film, the evolution of magnetic domain structure gives evidence of a reorientation of twin variants of martensite. A microstructural model is described to define the twin structure and to produce the magnetic domain structure at the beginning of martensitic transformation; based on this model, the relationship between the twin structure and the magnetic domain structure for the treated film under an in-plane field is also described.
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| 关 键 词： | 马氏体相变 磁畴结构 磁场诱导 温度场 薄膜 相互作用 MgO(001) 微结构模型 |
Evolution of magnetic domain structure of martensite in Ni-Mn-Ga films under the interplay of the temperature and magnetic field |
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| Abstract: | Ni-Mn-Ga film, martensitic transformation, magnetically induced reorientation, magnetic domain structure |
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| Keywords: | Ni-Mn-Ga film martensitic transformation magnetically induced reorientation magnetic domain structure |
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