Electric-field effect on the easy cone angle of the easy-cone state in CoFeB/MgO investigated by ferromagnetic resonance

Atsushi Okada; Shun Kanai; Shunsuke Fukami; Hideo Sato; Hideo Ohno

doi:10.1063/1.5026418

Electric-field effect on the easy cone angle of the easy-cone state in CoFeB/MgO investigated by ferromagnetic resonance

Atsushi Okada, Shun Kanai, Shunsuke Fukami, Hideo Sato, Hideo Ohno

Tohoku University

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We investigate the effect of an electric field on the cone angle of the easy-cone state in a CoFeB/MgO stack by ferromagnetic resonance as a function of temperature. We find that the easy cone state appears in the CoFeB/MgO system below 200 K. The application of electric field E modulates the effective first-order magnetic anisotropy energy constant, whereas the second-order magnetic anisotropy energy constant is almost independent of E, resulting in the variation of the cone angle by E. The present observation reveals the importance of the modulation of the magnetic anisotropy by E in magnetic tunnel junctions exhibiting an easy-cone state under spin-transfer-torque-induced switching.

Original language	English
Article number	172402
Journal	Applied Physics Letters
Volume	112
Issue number	17
DOIs	https://doi.org/10.1063/1.5026418
Publication status	Published - 2018 Apr 23

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title = "Electric-field effect on the easy cone angle of the easy-cone state in CoFeB/MgO investigated by ferromagnetic resonance",

abstract = "We investigate the effect of an electric field on the cone angle of the easy-cone state in a CoFeB/MgO stack by ferromagnetic resonance as a function of temperature. We find that the easy cone state appears in the CoFeB/MgO system below 200 K. The application of electric field E modulates the effective first-order magnetic anisotropy energy constant, whereas the second-order magnetic anisotropy energy constant is almost independent of E, resulting in the variation of the cone angle by E. The present observation reveals the importance of the modulation of the magnetic anisotropy by E in magnetic tunnel junctions exhibiting an easy-cone state under spin-transfer-torque-induced switching.",

author = "Atsushi Okada and Shun Kanai and Shunsuke Fukami and Hideo Sato and Hideo Ohno",

note = "Funding Information: The authors thank F. Matsukura, J. Llandro, C. Igarashi, T. Hirata, K. Goto, and H. Iwanuma for their technical support and discussion. This work was supported in part by a Grant-in-Aid for JSPS Fellows, JST-OPERA, and a Grant-in-Aid for Scientific Research (No. 16J05455) from JSPS and Research and Development for Next-Generation Information Technology of MEXT. Publisher Copyright: {\textcopyright} 2018 Author(s).",

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T1 - Electric-field effect on the easy cone angle of the easy-cone state in CoFeB/MgO investigated by ferromagnetic resonance

AU - Okada, Atsushi

AU - Kanai, Shun

AU - Fukami, Shunsuke

AU - Sato, Hideo

AU - Ohno, Hideo

N1 - Funding Information: The authors thank F. Matsukura, J. Llandro, C. Igarashi, T. Hirata, K. Goto, and H. Iwanuma for their technical support and discussion. This work was supported in part by a Grant-in-Aid for JSPS Fellows, JST-OPERA, and a Grant-in-Aid for Scientific Research (No. 16J05455) from JSPS and Research and Development for Next-Generation Information Technology of MEXT. Publisher Copyright: © 2018 Author(s).

PY - 2018/4/23

Y1 - 2018/4/23

N2 - We investigate the effect of an electric field on the cone angle of the easy-cone state in a CoFeB/MgO stack by ferromagnetic resonance as a function of temperature. We find that the easy cone state appears in the CoFeB/MgO system below 200 K. The application of electric field E modulates the effective first-order magnetic anisotropy energy constant, whereas the second-order magnetic anisotropy energy constant is almost independent of E, resulting in the variation of the cone angle by E. The present observation reveals the importance of the modulation of the magnetic anisotropy by E in magnetic tunnel junctions exhibiting an easy-cone state under spin-transfer-torque-induced switching.

AB - We investigate the effect of an electric field on the cone angle of the easy-cone state in a CoFeB/MgO stack by ferromagnetic resonance as a function of temperature. We find that the easy cone state appears in the CoFeB/MgO system below 200 K. The application of electric field E modulates the effective first-order magnetic anisotropy energy constant, whereas the second-order magnetic anisotropy energy constant is almost independent of E, resulting in the variation of the cone angle by E. The present observation reveals the importance of the modulation of the magnetic anisotropy by E in magnetic tunnel junctions exhibiting an easy-cone state under spin-transfer-torque-induced switching.

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M1 - 172402

ER -

Electric-field effect on the easy cone angle of the easy-cone state in CoFeB/MgO investigated by ferromagnetic resonance

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