Department of Physics and Astronomy: Publications and Other Research

 

Date of this Version

2014

Citation

IEEE Magnetics Letters 5 (2014)

Abstract

The interplay between electric field-controlled surface magnetic anisotropy and micromagnetic nu-cleation modes for L10-CoPt thin films is investigated with density-functional and micromagnetic model calculations. The electric field redistributes electron states near the Fermi level, which has a fairly strong effect on the surface anisotropy, but due to inversion symmetry, the net anisotropy of the films with odd numbers of layers remains unchanged. By contrast, the micromagnetic nucleation mode is spatially asymmetric even for symmetric thin films with odd numbers of layers. This leads to a reduction of the nucleation field (coercivity) and—for suitably chosen nanostructures—to sub-stantial changes in the hysteretic behavior. In the lowest order, the coercivity reduction is independ-ent of the total film thickness. This counterintuitive feature can potentially be exploited in magneto-electric switching devices.

Included in

Physics Commons

Share

COinS