Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co40Fe40B20/MgO structures

Congli He; Aryan Navabi; Qiming Shao; Guoqiang Yu; Di Wu; Weihua Zhu; Cheng Zheng; Xiang Li; Qing Lin He; Seyed Armin Razavi; Kin L. Wong; Zongzhi Zhang; Pedram Khalili Amiri; Kang L. Wang

doi:10.1063/1.4967843

Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co₄₀Fe₄₀B₂₀/MgO structures

Congli He, Aryan Navabi, Qiming Shao, Guoqiang Yu, Di Wu, Weihua Zhu, Cheng Zheng, Xiang Li, Qing Lin He, Seyed Armin Razavi, Kin L. Wong, Zongzhi Zhang, Pedram Khalili Amiri, Kang L. Wang

College of Electrical Engineering and Computer Science

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

38 Citations (Scopus)

Abstract

We study the magnetic properties of W/Co₄₀Fe₄₀B₂₀ (CoFeB)/MgO films using the spin-torque ferromagnetic resonance (ST-FMR) technique. This study takes the advantage of the spin Hall magnetoresistance (SMR) for generating an oscillating resistance, which is one of the necessary requirements for obtaining mixing voltage in the ST-FMR technique. We have measured both the as-grown and the annealed samples with different CoFeB layer thicknesses, which include the in-plane and out-of-plane magnetic anisotropies. The spectra for these two types of anisotropies show distinct signatures. By analyzing the ST-FMR spectra, we extract the effective anisotropy field for both types of samples. In addition, we investigate the influence of CoFeB thickness and annealing on the Gilbert damping constant. Our experiments show that by taking advantage of SMR, the ST-FMR measurement acts as an effective tool with high sensitivity for studying the magnetic properties of ultrathin magnetic films.

Original language	English
Article number	202404
Journal	Applied Physics Letters
Volume	109
Issue number	20
DOIs	https://doi.org/10.1063/1.4967843
Publication status	Published - 2016 Nov 14

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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@article{2e16f80140c64eaeb31c608e70352825,

title = "Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co40Fe40B20/MgO structures",

abstract = "We study the magnetic properties of W/Co40Fe40B20 (CoFeB)/MgO films using the spin-torque ferromagnetic resonance (ST-FMR) technique. This study takes the advantage of the spin Hall magnetoresistance (SMR) for generating an oscillating resistance, which is one of the necessary requirements for obtaining mixing voltage in the ST-FMR technique. We have measured both the as-grown and the annealed samples with different CoFeB layer thicknesses, which include the in-plane and out-of-plane magnetic anisotropies. The spectra for these two types of anisotropies show distinct signatures. By analyzing the ST-FMR spectra, we extract the effective anisotropy field for both types of samples. In addition, we investigate the influence of CoFeB thickness and annealing on the Gilbert damping constant. Our experiments show that by taking advantage of SMR, the ST-FMR measurement acts as an effective tool with high sensitivity for studying the magnetic properties of ultrathin magnetic films.",

author = "Congli He and Aryan Navabi and Qiming Shao and Guoqiang Yu and Di Wu and Weihua Zhu and Cheng Zheng and Xiang Li and He, {Qing Lin} and Razavi, {Seyed Armin} and Wong, {Kin L.} and Zongzhi Zhang and Amiri, {Pedram Khalili} and Wang, {Kang L.}",

note = "Funding Information: This work acknowledges the support by the Spins and Heat in Nanoscale Electronic Systems (SHINES), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award No. SC0012670 Publisher Copyright: {\textcopyright} 2016 Author(s).",

year = "2016",

month = nov,

day = "14",

doi = "10.1063/1.4967843",

language = "English",

volume = "109",

journal = "Applied Physics Letters",

issn = "0003-6951",

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T1 - Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co40Fe40B20/MgO structures

AU - He, Congli

AU - Navabi, Aryan

AU - Shao, Qiming

AU - Yu, Guoqiang

AU - Wu, Di

AU - Zhu, Weihua

AU - Zheng, Cheng

AU - Li, Xiang

AU - He, Qing Lin

AU - Razavi, Seyed Armin

AU - Wong, Kin L.

AU - Zhang, Zongzhi

AU - Amiri, Pedram Khalili

AU - Wang, Kang L.

N1 - Funding Information: This work acknowledges the support by the Spins and Heat in Nanoscale Electronic Systems (SHINES), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award No. SC0012670 Publisher Copyright: © 2016 Author(s).

PY - 2016/11/14

Y1 - 2016/11/14

N2 - We study the magnetic properties of W/Co40Fe40B20 (CoFeB)/MgO films using the spin-torque ferromagnetic resonance (ST-FMR) technique. This study takes the advantage of the spin Hall magnetoresistance (SMR) for generating an oscillating resistance, which is one of the necessary requirements for obtaining mixing voltage in the ST-FMR technique. We have measured both the as-grown and the annealed samples with different CoFeB layer thicknesses, which include the in-plane and out-of-plane magnetic anisotropies. The spectra for these two types of anisotropies show distinct signatures. By analyzing the ST-FMR spectra, we extract the effective anisotropy field for both types of samples. In addition, we investigate the influence of CoFeB thickness and annealing on the Gilbert damping constant. Our experiments show that by taking advantage of SMR, the ST-FMR measurement acts as an effective tool with high sensitivity for studying the magnetic properties of ultrathin magnetic films.

AB - We study the magnetic properties of W/Co40Fe40B20 (CoFeB)/MgO films using the spin-torque ferromagnetic resonance (ST-FMR) technique. This study takes the advantage of the spin Hall magnetoresistance (SMR) for generating an oscillating resistance, which is one of the necessary requirements for obtaining mixing voltage in the ST-FMR technique. We have measured both the as-grown and the annealed samples with different CoFeB layer thicknesses, which include the in-plane and out-of-plane magnetic anisotropies. The spectra for these two types of anisotropies show distinct signatures. By analyzing the ST-FMR spectra, we extract the effective anisotropy field for both types of samples. In addition, we investigate the influence of CoFeB thickness and annealing on the Gilbert damping constant. Our experiments show that by taking advantage of SMR, the ST-FMR measurement acts as an effective tool with high sensitivity for studying the magnetic properties of ultrathin magnetic films.

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Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co₄₀Fe₄₀B₂₀/MgO structures

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