Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4892824
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Funding
- JSPS [23360002]
- ASPIMATT program from JST
- MEXT
- Grants-in-Aid for Scientific Research [23360002] Funding Source: KAKEN
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We investigate electric-field effects on the effective magnetic anisotropy energy density K-eff and the Gilbert damping constant alpha 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 K(eff)t 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 alpha is observed for the structure with t = 1.4 nm, and almost no modulation for the structures with t >= 1.5 nm. (C) 2014 AIP Publishing LLC.
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