Program

O.18 -- Oral, NCTP-42

Date: Wednesday, 2 August 2017

Time: 11h30 - 11h50

Electric-field modification of magnetism in a free-standing palladium ultra-thin film

Tran Van Quang

Department of Physics, University of Transport and Communications, Hanoi, Vietnam

Recently, several magnetic properties have been found to be tunable with an applied electric field, which enabled the electrically assisted magnetic recording. In this work, we performed first-principles calculation to demonstrate that the electric field produces a surface magnetoelectric effect on a free-standing palladium ultra-thin film. We consider a bilayer strained Pd film in vacuum within an external electric field. The magnetic moment of Pd is found to be unchanged under an applied electric field below a critical value, E_c whereas the change follows a square-root variation with the electric field above E_c. This is originating from induced spin density of d-states. Under the electric field, the Fermi energy is likely to be shifted to increase majority spin density whereas it reduces the minority one. The major change is found in the occupancies of d_(x^2-y^2)^ ,d_xy and d_xz. This feature is responsible for the magnetoelectric coupling.

Presenter: Tran Van Quang