Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism

Autor:	Jun Okabayashi, Kazuya Z. Suzuki, Shigemi Mizukami
Rok vydání:	2022
Předmět:	Condensed Matter - Materials Science Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Condensed Matter Physics Electronic Optical and Magnetic Materials
Zdroj:	Journal of Magnetism and Magnetic Materials. 564:170163
ISSN:	0304-8853
Popis:	The magnetic atom diffusion at the interface between CoMn alloy and MnGa layer with annealing is studied using x-ray magnetic circular dichroism (XMCD) analysis. We found that the spins in bcc CoMn are coupled parallel to those in perpendicularly magnetized MnGa layer under the as-grown conditions, while the post-annealing modulates the interfacial magnetic coupling to antiferromagnetic in Co. The element-specific hysteresis curves at each absorption edge revealed the large coercive fields in Mn and Co through the exchange coupling with MnGa. After the annealing process, the changes of XMCD spectral line shapes are related to the interfacial reactions promoting the formation of Mn and Co2MnGa layers, which is deduced from the analysis of transmission electron microscopy. The interfacial diffusion of Mn atoms modulates the magnetic exchange coupling between Mn and Co sites and reverses the direction of perpendicular magnetization. Comment: 12 pages including 3 figures
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c404104ec3b501c4ce4bb814f0cc18d8 https://doi.org/10.1016/j.jmmm.2022.170163 Zobrazit plný text záznamu Full Text from ScienceDirect