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Informal Theory Seminar: Origin of the spin reorientation transitions in antiferromagnetic MnPt-based alloys
Date : Friday, July 28th, 2017 16:00 - 17:00 Place : Seminar Room 5 (A615), 6th Floor, ISSP Lecturer : Dr. Po-Hao Chang Affiliation : Department of Physics and Astronomy, University of Nebraska-Lincoln Committee Chair : OZAKI Taisuke (63285)
e-mail: t-ozaki@issp.u-tokyo.ac.jp

Antiferromagnetic MnPt exhibits a spin reorientation transition (SRT) as a function of temperature, and offstoichiometric Mn-Pt alloys also display SRTs as a function of concentration. Here we describe the origin of these SRTs using first-principles calculations based on the coherent potential approximation, treating chemical and thermally-induced spin disorder on equal footing. We find that the experimentally observed SRTs are related to specific features in the band structure, and we perform a detailed analysis of the effects of temperature and concentration on the magnetocrystalline anisotropy.

Reference:
P.-H. Chang, T. Markussen, S. Smidstrup, K. Stokbro, and B.K. Nikolic, Phys. Rev. B 92, 201406(R) (2015).

J.M. Marmolejo-Tejada, K. Dolui, P. Lazic, P.-H. Chang, S. Smidstrup, D. Stradi, K. Stokbro, B.K. Nikolic, arXiv:1701.00462.


(Published on: Friday July 14th, 2017)