Atomic Occupation and Role of Cr Atoms in Cr-Doped Ni43co7mn39sn11 Magnetic Shape Memory Alloys

作     者：Wang, Songwang Yang, Ruoou Lu, Guangduo Yi, Lizhi Liu, Min Xu, Yunli Pan, Liqing 

作者机构：Hubei Engineering Research Center of Weak Magnetic-field Detection College of Science China Three Gorges University Yichang443002 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Shanghai Synchrotron Radiation Facility Zhangjiang National Lab Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Cobalt alloys 

摘      要：The atomic occupation, magnetic properties and the relationship between them of Ni43Co7Mn39-xCrxSn11( x =0, 0.4, 0.6, 0.8, 1.0, 1.2 at.%) alloys have been systematically investigated. To elucidate the occupancy of Cr atoms, extended X-ray absorption fine structure (EXAFS) is performed and Cr K-edge EXAFS analysis determines that Cr atoms occupy Y site of the Ni43Co7Mn38Cr1Sn11 sample. Ferromagnetic resonance shows the evolution of the microscopic magnetic properties of the magnetic atoms with the increase of Cr doping content, which further confirms the Y-site occupation of Cr atoms. The experimental results show that in the Ni43Co7Mn39Sn11 system, Cr doping replaces Mn at the Y site, breaking the symmetry of the crystal field of Mn atoms at the Z site, reducing the atomic displacement potential. The doping of Cr atoms significantly enhances the driving force of its magnetic field-induced martensitic transformation. © 2022, The Authors. All rights reserved.