Atomic relaxation effects on magnetism in CoPt nanoalloys

8th International Conference on Fine Particle Magnetism

Dupuis, V.^1 ; Tamion, A.^1

ILM, UMR 5306 CNRS, Université de Lyon, F-69622 Villeurbanne cedex, France^1

关键词: Atomic relaxation;    Element specific;    Extended X-ray absorption fine structures;    Magnetic anisotropy energy;    Magnetic behaviour;    SQUID magnetometry;    Thermal ordering;    X-ray magnetic circular dichroism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/521/1/012001/pdf
DOI  :  10.1088/1742-6596/521/1/012001

来源: IOP

【 摘 要 】

We describe the magnetism of CoPt clusters upon annealing-driven transition to chemically ordered L10-like phase. In one hand, X-ray magnetic circular dichroism (XMCD) investigations at each L2 3 edge, revealed a significant increase of both spin and orbital of Co and Pt magnetic moments after thermal ordering transition. In the other hand, reversely to the bulk alloys, a limited Magnetic Anisotropy Energy (MAE) enhancement has been obtained from SQUID magnetometry measurements on the same chemically ordered CoPt nanomagnets samples. In this paper, we relate such magnetic behaviour to element-specific dependence of the local atomic relaxations in nanoalloys, described from extended x-ray absorption fine structure (EXAFS) experiments.