Transformation behaviors, structural and magnetic characteristics of Ni–Mn–Ga films on MgO (001)

doi:10.1088/1674-1056/22/10/107502

Abstract 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 continuous. 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 martensite 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 martensitic 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.

Keywords: Ni–Mn–Ga film ferromagnetic-shape memory alloy transformation behavior magnetically induced reorientation magnetically induced martensitic transformation

Received: 14 May 2013
Revised: 07 June 2013
Accepted manuscript online:

PACS:	75.70.Ak	(Magnetic properties of monolayers and thin films)
	75.70.Kw	(Domain structure (including magnetic bubbles and vortices))

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 Priority Academic Program Development of Jiangsu Higher Education Institutions.

Corresponding Authors: Tang Shao-Long
E-mail: tangsl@nju.edu.cn

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Xie Ren (谢忍), Tang Shao-Long (唐少龙), Tang Yan-Mei (唐妍梅), Liu Xiao-Chen (刘枭辰), Tang Tao (唐涛), Du You-Wei (都有为) Transformation behaviors, structural and magnetic characteristics of Ni–Mn–Ga films on MgO (001) 2013 Chin. Phys. B 22 107502

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[1]	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), 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). Chin. Phys. B, 2014, 23(6): 068103.

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Transformation behaviors, structural and magnetic characteristics of Ni–Mn–Ga films on MgO (001)

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