Observation of magnetic domain evolution in constrained epitaxial Ni–Mn–Ga thin films on MgO(0 0 1) substrate  

作　　者：Bo Yang Ivan Soldatov Fenghua Chen Yudong Zhang Zongbin Li Haile Yan Rudolf Schäfer Dunhui Wang Claude Esling Xiang Zhao Liang Zuo 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Material Science and Engineering,Northeastern University,Shenyang 110819,China [2]Institute for Metallic Materials,Leibniz Institute for Solid State and Materials Research(IFW)Dresden,Helmholtzstrasse 20,01069 Dresden,Germany [3]Institute of Natural Sciences,Ural Federal University,620002 Ekaterinburg,Russia [4]Department of Physics,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China [5]Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux(LEM3),CNRS UMR 7239,Universitéde Lorraine,57045 Metz,France [6]Institute for Materials Science,Dresden University of Technology,01062 Dresden,Germany [7]National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nanotechnology and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Journal of Materials Science & Technology》2022年第7期56-65,共10页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grants Nos. 52071071);the Liaoning Revitalization Talents Program (Grant No. XLYC1802023);the Fundamental Research Funds for the Central Universities of China (Grant Nos. N2102006);the Program of Introducing Talents of Discipline Innovation to Universities 2.0 (the 111 Project of China 2.0, No. BP0719037)。

摘　　要：Epitaxial Ni–Mn–Ga thin films have promising application potential in micro-electro-mechanical sensing and actuation systems. To date, large abrupt magnetization changes have been observed in some epitaxial Ni–Mn–Ga thin films, but their origin-either from magnetically induced martensite variant reorientation(MIR) or magnetic domain evolution-has been discussed controversially. In the present work, we investigated the evolutions of the magnetic domain and microstructure of a typical epitaxial Ni–Mn–Ga thin film through wide-field magneto-optical Kerr-microscopy. It is demonstrated that the abrupt magnetization changes in the hysteresis loops should be attributed to the magnetic domain evolution instead of the MIR.

关 键 词：Ni–Mn–Ga thin films Magnetic field-induced variant reorientation Magnetic domains Magnetization process Magneto-optical Kerr microscopy 

分 类 号：TB383.2[一般工业技术—材料科学与工程]