Electric-field effects on magnetic anisotropy and damping constant in Ta/CoFeB/MgO investigated by ferromagnetic resonance

A. Okada, S. Kanai, M. Yamanouchi, S. Ikeda, F. Matsukura, H. Ohno

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Abstract

We investigate electric-field effects on the effective magnetic anisotropy energy density Keff and the Gilbert damping constant α in Ta/CoFeB/MgO structures with CoFeB thickness t ranging from 1.4 to 1.8 nm by ferromagnetic resonance. The electric field-induced modulation ratio of the areal energy density Kefft does not depend on the CoFeB thickness, indicating that the electric-field effect on the magnetic anisotropy originates from the modulation of CoFeB/MgO-interfacial magnetic anisotropy. A clear electric-field modulation of α is observed for the structure with t = 1.4 nm, and almost no modulation for the structures with t ≥1.5 nm.

Original languageEnglish
Article number052415
JournalApplied Physics Letters
Volume105
Issue number5
DOIs
Publication statusPublished - 2014 Aug 4

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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