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Electric-field-induced changes of magnetic moments and magnetocrystalline anisotropy in ultrathin cobalt films

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arxiv 1708.08549 v2 pith:FMNKQU3Q submitted 2017-08-28 cond-mat.mtrl-sci

Electric-field-induced changes of magnetic moments and magnetocrystalline anisotropy in ultrathin cobalt films

Takeshi Kawabe , Kohei Yoshikawa , Masahito Tsujikawa , Takuya Tsukahara , Kohei Nawaoka , Yoshinori Kotani , Kentaro Toyoki , Minori Goto
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Motohiro Suzuki Tetsuya Nakamura Masafumi Shirai Yoshishige Suzuki Shinji Miwa
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classification cond-mat.mtrl-sci
keywords magneticmomentorbitalvcmaanisotropychangechangesd-ferromagnetic
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In this study, the microscopic origins of the voltage-controlled magnetic anisotropy (VCMA) in 3d-ferromagnetic metals are revealed. Using in-situ X-ray fluorescence spectroscopy that provides a high quantum efficiency, electric-field-induced changes in orbital magnetic moment and magnetic dipole Tz terms in ultrathin Co films are demonstrated. An orbital magnetic moment difference of 0.013{\mu}B. was generated in the presence of electric fields of +(-)0.2 V/nm. The VCMA of Co was properly estimated by the induced change in orbital magnetic moment, according to the perturbation theory model. The induced change in magnetic dipole Tz term only slightly contributed to the VCMA in 3d-ferromagnetic metals.

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