| Transformation behaviors,structural and magnetic characteristics of Ni-Mn-Ga films on MgO （001） |
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| 引用本文： | 谢忍,唐少龙,唐妍梅,刘枭辰,唐涛,都有为.Transformation behaviors,structural and magnetic characteristics of Ni-Mn-Ga films on MgO （001）[J].中国物理 B,2013(10):522-528. |
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| 作者姓名： | 谢忍 唐少龙 唐妍梅 刘枭辰 唐涛 都有为 |
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| 作者单位： | National Laboratory of Microstructures, Jiangsu Provincial Laboratory for Nanotechnology and Depa~ment of Physics, Nanjing University, Nanjing 210093, China |
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| 基金项目： | Project 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 Priority Academic Program Development of Jiangsu Higher Education Institutions |
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| 摘 要： | Ferromagnetic Ni-Mn-Ga films were fabricated by depositing on MgO （001） substrates at temperatures from 673 K to 923 K. Microstructure, crystal structure, martensitic transformation behavior, and magnetic properties of the films were studied. With increasing deposition temperature, the surface morphology of the films transforms from granular to continu- ous. The martensitic transformation temperature is not dependent on deposition temperature; while transformation behavior is affected substantially by deposition temperature. X-ray analysis reveals that the film deposited at 873 K has a 7M marten- site phase, and its magnetization curve provides a typical step-increase, indicating the occurrence of magnetically induced reorientation （MIR）. In situ magnetic domain structure observation on the film deposited at 873 K reflects that the marten- sitic transformation could be divided into two periods： nucleation and growth, in the form of stripe domains. The MIR occurs at the temperature at which martensitic transformation starts, and the switching field increases with the decrease of temperature due to damped thermal activation. The magnetically induced martensitic transformation is related to the difference of magnetization between martensite and austenite. A shift of martensite temperature of dT/dH = 0.43 K/T is observed, consistent with the theoretical value, 0.41 K/T.
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| 关 键 词： | MgO（001） 相变行为 微观结构 磁特性 薄膜 马氏体相变温度 沉积温度 衬底温度 |
Transformation behaviors,structural and magnetic characteristics of Ni-Mn-Ga films on MgO(001) |
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| Abstract: | Ni-Mn-Ga film, ferromagnetic-shape memory alloy, transformation behavior, magnetically in-duced reorientation, magnetically induced martensitic transformation |
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| Keywords: | Ni-Mn-Ga film ferromagnetic-shape memory alloy transformation behavior magnetically in-duced reorientation magnetically induced martensitic transformation |
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