First-principles calculations for high-temperature ferromagnetic semiconductor (In,Fe)Sb

POSTER

Abstract

Fe-doped semiconductors have been attracting much attention due to fascinating properties. In fact, Fe-doped InSb not only exhibits the high Curie temperature but can also be n-type doping [1]. Our previours calculations reveal that, (In,Fe)Sb has complex magnetic properties [2]. In the isoelectronic (In,Fe)Sb case, the Fe atoms show strong antiferromagnetic interactions due to the superexchange mechanism. We have demonstrated that by modulating the chemical potentials corresponding to n- or p-type doping, the magnetic property can be changed drastically from antiferromagnetism to ferromagnetism. This transition can be well understood in terms of the Alexander-Anderson-Moriya mechanism. However, we have obtained high Curie temperature in only p-type (In,Fe)Sb case. We suspect that there are the other ferromagnetic mechanisms in addition to the magnetic transition and spinodal nano-decomposition in (In,Fe)Sb. In this study, we have clarified the origin of high Curie temperature by the density functional theory calculations.

[1] N. T. Tu, et al., Appl. Phys. Lett. 108, 192401 (2016).
[2] H. Shinya, et al., J. Appl. Phys. 124, 103902 (2018).

Presenters

  • Hikari Shinya

    Research Institute of Electrical Communication, Tohoku University, Tohoku University

Authors

  • Hikari Shinya

    Research Institute of Electrical Communication, Tohoku University, Tohoku University

  • Tetsuya Fukushima

    The Institute of Solid State Physics, The University of Tokyo, Institute for Solid State Physics, University of Tokyo, The University of Tokyo

  • Akira Masago

    Graduate School of Engineering Science, Osaka University, Center for spintronics research network (CSRN), Osaka University, Osaka University

  • Kazunori Sato

    Graduate School of Engineering, Osaka University, Division of Materials and Manufacturing Science, Osaka University, Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka University

  • Hiroshi Katayama-Yoshida

    Graduate School of Engineering, The University of Tokyo, The Univesity of Tokyo, The University of Tokyo