Influence of W doping on the structure, magnetism and exchange bias in Ni47Mn40Sn13 -xWxHeusler alloys

M Norouzi-Inallu; P Kameli; A Ghotbi Varzaneh; I Abdolhosseini Sarsari; M Abbasi Eskandari; I Orue; B Rodríguez-Crespo; V Chernenko

doi:10.1088/1361-648X/ac5311

Influence of W doping on the structure, magnetism and exchange bias in Ni₄₇Mn₄₀Sn_{13 -x}W_xHeusler alloys

J Phys Condens Matter. 2022 Mar 31;34(22). doi: 10.1088/1361-648X/ac5311.

Authors

M Norouzi-Inallu¹, P Kameli¹, A Ghotbi Varzaneh¹, I Abdolhosseini Sarsari¹, M Abbasi Eskandari², I Orue³, B Rodríguez-Crespo⁴, V Chernenko^{4

5}

Affiliations

¹ Department of Physics, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
² Department of Physics & RQMP, Sherbrooke University, Sherbrooke, Quebec, Canada.
³ SGiker, Vicerrectorado de Inv. UPV/EHU, Leioa 48940, Spain.
⁴ BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, Leioa 48940, Spain.
⁵ Ikerbasque, Basque Foundation for Science, Bilbao 48009, Spain.

PMID: 35134793
DOI: 10.1088/1361-648X/ac5311

Abstract

The influence of the W-doping on the martensitic transformation, magnetic properties and exchange bias (EB) effect in the Ni₄₇Mn₄₀Sn_13-xW_x(x= 0, 0.5, 1, 1.25 at.%) magnetic shape memory alloys has been investigated. It is found that the W-doping causes a simultaneous reduction of both the ferromagnetic (FM) exchange coupling and enhancement of the magnetic anisotropy, leading to a decrease of the magnetic moment of the low-temperature phase and to a higher attainable EB. The magnetic memory measurements reveal the presence of a glassy magnetic ground state, which can significantly impact the reduction of magnetization and enhancement of EB in the studied bulk alloys. It is argued that the glassy magnetic ground state originates from the partial magnetic disorder resulting from the correlation between the antiferromagnetic and FM states. The results demonstrate that the doping by W instead of Sn is an efficient tool to tailor the EB effect in the Ni-Mn-Sn-based Heusler alloys, whereby they are promising for spintronic applications.

Keywords: Ni47Mn40Sn13−x W x magnetic shape memory alloys; exchange bias effect; glassy magnetic ground state; magnetic memory; martensitic transformation.