Electric-Field-Induced Modification of the Magnon Energy, Exchange Interaction, and Curie Temperature of Transition-Metal Thin Films

M. Oba, K. Nakamura, T. Akiyama, T. Ito, M. Weinert, and A. J. Freeman
Phys. Rev. Lett. 114, 107202 – Published 13 March 2015

Abstract

The electric-field-induced modification in the Curie temperature of prototypical transition-metal thin films with the perpendicular magnetic easy axis, a freestanding Fe(001) monolayer and a Co monolayer on Pt(111), is investigated by first-principles calculations of spin-spiral structures in an external electric field (E field). An applied E field is found to modify the magnon (spin-spiral formation) energy; the change arises from the E-field-induced screening charge density in the spin-spiral states due to p-d hybridizations. The Heisenberg exchange parameters obtained from the magnon energy suggest an E-field-induced modification of the Curie temperature, which is demonstrated via Monte Carlo simulations that take the magnetocrystalline anisotropy into account.

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  • Received 20 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.107202

© 2015 American Physical Society

Authors & Affiliations

M. Oba1, K. Nakamura1,*, T. Akiyama1, T. Ito1, M. Weinert2, and A. J. Freeman3

  • 1Department of Physics Engineering, Mie University, Tsu, Mie 514-8507, Japan
  • 2Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA
  • 3Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA

  • *kohji@phen.mie-u.ac.jp

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Vol. 114, Iss. 10 — 13 March 2015

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