Fine tuning of the magnetic properties in Mn3-xCoxGa Heusler films near the critical regime

Lee K, Yoo W, Nguyen QAT, Bang HW, Kim H, Klaeui M, Rhim SH, Jung MH (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Alloys and Compounds Elsevier

Book Volume: 858

Article Number: 158288

DOI: 10.1016/j.jallcom.2020.158288

Abstract

Tunability of structural and magnetic properties of Mn3-xCoxGa films is presented by Co substitution, where critical behavior emerges 0.37 ≤ x ≤ 0.56 exhibiting a transition from tetragonal hard ferrimagnetic with perpendicular magnetic anisotropy (PMA) to a cubic soft ferrimagnetic phase with in-plane magnetic anisotropy (IMA). In the critical regime, coexisting state of tetragonal and cubic phases possesses significantly low coercive field (HC = 1.9 kOe) with relatively low saturation magnetization (MS = 100~150 emu/cc) while maintaining the PMA. From first-principles calculations, moments of two Mn sites do not change upon Co substitution. However, moments of substituted Co almost vanish in tetragonal while giving around 1 μB in cubic phase, which agrees with overall MS behaviors of the experimental results. These findings not only uncover the hidden magnetic state in Mn3-xCoxGa by altering the parallel and antiparallel coupling between Mn and Co, but also provide an additional degree of freedom for spintronic applications using Mn-based Heusler compounds.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Sogang University KR Korea, Republic of (KR) University of Ulsan / 울산대학교 KR Korea, Republic of (KR)

How to cite

APA:

Lee, K., Yoo, W., Nguyen, Q.A.T., Bang, H.-W., Kim, H., Klaeui, M.,... Jung, M.-H. (2021). Fine tuning of the magnetic properties in Mn3-xCoxGa Heusler films near the critical regime. Journal of Alloys and Compounds, 858. https://doi.org/10.1016/j.jallcom.2020.158288

MLA:

Lee, Kyujoon, et al. "Fine tuning of the magnetic properties in Mn3-xCoxGa Heusler films near the critical regime." Journal of Alloys and Compounds 858 (2021).

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