中国物理B ›› 2014, Vol. 23 ›› Issue (6): 68103-068103.doi: 10.1088/1674-1056/23/6/068103
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
谢忍a, 韦俊a, 刘仲武b, 唐妍梅a, 唐涛a, 唐少龙a, 都有为a
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
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 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.
中图分类号: (Treatment of materials and its effects on microstructure, nanostructure, And properties)