Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 827, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154303
Keywords
Ni-Mn-Sn; Martensitic transformation; Exchange bias; Mica substrates
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Funding
- National Natural Science Foundation of China [51771053, 51971109, 51471085]
- National Key Research and Development Program of China [2016YFA030080]
- Fundamental Research Funds for the Central University
- open research fund of Key Laboratory of MEMS of Ministry of Education, Southeast University
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y The fabrication of high-quality Heusler alloy films with clear martensitic transformation is a challenging issue in the field of magnetic shape memory alloys. Here, flexible Mn-rich Ni-Mn-Sn (Mn49.9Ni40.4Sn9.7) thin films are successfully synthesized by pulsed laser deposition on mica substrates using Ti as buffer layer. XRD analysis reveals that films exhibit austenitic phase with L2(1) structure at room temperature. The surface morphology indicates polycrystalline structure of fine grains with size of about 60 nm and smooth surface with roughness of less than 1 nm. The temperature dependent magnetization measurement clearly confirms the existence of first-order martensitic transformation. Exchange bias was observed below 70 K with maximum exchange bias field of 148 Oe at 20 K, which is attributed to the exchange coupling between the coexisting antiferromagnetic and ferromagnetic phases due to the various occupations of Mn atoms. (C) 2020 Elsevier B.V. All rights reserved.
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