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

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

doi:10.1063/1.4967843

Title: Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co₄₀Fe₄₀B₂₀/Mg_O structures

Journal Article · Fri Nov 18 00:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4967843· OSTI ID:1473876

He, Congli ^[1];

^[1];

^[1]; Wu, Di ^[2]; Zhu, Weihua ^[3]; Zheng, Cheng ^[1];

^[1]; He, Qing Lin ^[1];

^[1]; Wong, Kin L. ^[1]; Zhang, Zongzhi ^[3]; Amiri, Pedram Khalili ^[1]; Wang, Kang L. ^[1]

Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering
Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering; Fudan Univ., Shanghai (China). Key Lab. of Micro and Nano Photonic Structures (Ministry of Education) and Dept. of Optical Science and Engineering
Fudan Univ., Shanghai (China). Key Lab. of Micro and Nano Photonic Structures (Ministry of Education) and Dept. of Optical Science and Engineering

Here, 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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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Los Angeles and Riverside, CA (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Semiconductor Research Corp. (SRC), Durham, NC (United States). STARnet; National Science Foundation (NSF); King Abdulaziz City for Science and Technology (KACST), Riyadh (Saudi Arabia). Center of Excellence for Green Nanotechnologies (CEGN)

Grant/Contract Number:: SC0012670; ECCS 1611570; EEC-1160504

OSTI ID:: 1473876

Alternate ID(s):: OSTI ID: 1332370

Journal Information:: Applied Physics Letters, Vol. 109, Issue 20; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Cited By (3)

Low Gilbert Damping Constant in Perpendicularly Magnetized W/CoFeB/MgO Films with High Thermal Stability Lattery, Dustin M.; Zhang, Delin; Zhu, Jie Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-31642-9	journal	September 2018
Spin-Torque Ferromagnetic Resonance in $W / Co − Fe − B / W / Co − Fe − B / Mg O$ Stacks He, Congli; Yu, Guoqiang; Grezes, Cecile Physical Review Applied, Vol. 10, Issue 3 https://doi.org/10.1103/physrevapplied.10.034067	journal	September 2018
Deficiency of the Bulk Spin Hall Effect Model for Spin-Orbit Torques in Magnetic Insulator/Heavy Metal Heterostructures Li, Junxue; Yu, Guoqiang; Tang, Chi arXiv https://doi.org/10.48550/arxiv.1705.08919	text	January 2017

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42 ENGINEERING
75 CONDENSED MATTER PHYSICS
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magnetic ordering
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free energy
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ferromagnetic resonance
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Title: Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co40Fe40B20/MgO structures

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Title: Spin-torque ferromagnetic resonance measurements utilizing spin Hall magnetoresistance in W/Co₄₀Fe₄₀B₂₀/Mg_O structures