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Phys Rev Lett. 2015 Mar 13;114(10):107202. Epub 2015 Mar 13.

Electric-field-induced modification of the magnon energy, exchange interaction, and curie temperature of transition-metal thin films.

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


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 MonteĀ Carlo simulations that take the magnetocrystalline anisotropy into account.

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