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Evolution of magnetic domain structure of martensite in Ni-Mn-Ga films under the interplay of the temperature and magnetic field |
Xie Ren (谢忍)a, Wei Jun (韦俊)a, Liu Zhong-Wu (刘仲武)b, Tang Yan-Mei (唐妍梅)a, Tang Tao (唐涛)a, Tang Shao-Long (唐少龙)a, Du You-Wei (都有为)a |
a National Laboratory of Microstructures, Jiangsu Provincial Laboratory for Nanotechnology and Department of Physics, Nanjing University, Nanjing 210093, China;
b School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract 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 interplay 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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Received: 18 October 2013
Revised: 18 February 2013
Accepted manuscript online:
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PACS:
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81.40.-z
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(Treatment of materials and its effects on microstructure, nanostructure, And properties)
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75.70.Kw
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(Domain structure (including magnetic bubbles and vortices))
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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Fund: 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), and the Program for New Century Excellent Talents in University (Grant No. NCET-11-0156), and the Priority Academic Program Development of Jiangsu Higher Education Institutions. |
Corresponding Authors:
Tang Shao-Long
E-mail: tangsl@nju.edu.cn
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Cite this article:
Xie Ren (谢忍), Wei Jun (韦俊), Liu Zhong-Wu (刘仲武), Tang Yan-Mei (唐妍梅), Tang Tao (唐涛), Tang Shao-Long (唐少龙), Du You-Wei (都有为) Evolution of magnetic domain structure of martensite in Ni-Mn-Ga films under the interplay of the temperature and magnetic field 2014 Chin. Phys. B 23 068103
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