Routes for enhanced magnetism in Ni-Mn-In metamagnetic shape memory alloys

SCRIPTA MATERIALIA

卷:167

Article

Lopez-Garcia, J.^1,2  Sanchez-Alarcos, V.^2,3  Recarte, V.^2,3  Perez-Landazabal, J. I.^2,3  Fabelo, O.¹  Cesari, E.⁴  Rodriguez-Velamazan, J. A.¹ 

[1] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble, France

[2] Univ Publ Navarra, Dept Fis, Campus Arrosadia, Pamplona 31006, Spain

[3] Univ Publ Navarra, Inst Adv Mat INAMAT, Campus Arrosadia, Pamplona 31006, Spain

[4] Univ Illes Balears, Dept Fis, Ctra Valldemossa,Km 7-5, E-07122 Palma De Mallorca, Spain

关键词: Ferromagnetic shape memory alloys;    Neutron diffraction;    Magnetic properties;    Magnetic coupling;   

DOI  :  10.1016/j.scriptamat.2019.03.025

来源: Elsevier

【 摘 要 】

We provide in-depth physical insight into the enhancement of the magnetic properties of metamagnetic shape memory alloys produced by thermal treatment and cobalt doping. We use neutron scattering to study the atomic order and magnetic structures in the austenitic phases of Ni50Mn34In16 and Ni45Co5Mn37In13 alloys in two different states induced by thermal treatments. The increase of the magnetization in the austenite phase, particularly by cobalt doping, is explained by the enhanced ferromagnetic coupling between the magnetic moments located in octahedral sites. The spin density maps obtained from polarized neutron diffraction reveal the magnetic interaction pathways responsible for this coupling scheme. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free