We demonstrate the compositional effect on the magnetodynamic and auto-oscillation properties of Fex/Pt (x = 10–40) nanoconstriction-based spin Hall nano-oscillators. Using spin-torque ferromagnetic resonance performed on microstrips, we measure a significant reduction in both damping and spin Hall efficiency with the increasing Fe content, which lowers the spin pumping contribution. The strong compositional effect on spin Hall efficiency is primarily attributed to the increased saturation magnetization in Fe-rich devices. As a direct consequence, higher current densities are required to drive spin-wave auto-oscillations at higher microwave frequencies in Fe-rich nanoconstriction devices. Our results establish the critical role of the compositional effect in engineering the magnetodynamic and auto-oscillation properties of spin Hall devices for microwave and magnonic applications.
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4 January 2021
Research Article|
January 05 2021
Compositional effect on auto-oscillation behavior of xFex/Pt spin Hall nano-oscillators
Special Collection:
Spin-Orbit Torque (SOT): Materials, Physics, and Devices
M. Haidar
;
M. Haidar
a)
1
Department of Physics, American University of Beirut
, Riad El-Solh, P.O. Box 11-0236, Beirut 1107-2020, Lebanon
a)Author to whom correspondence should be addressed: [email protected]
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H. Mazraati
;
H. Mazraati
2
NanOsc AB
, Kista 164 40, Sweden
3
Department of Materials and Nanophysics, School of Engineering Sciences, KTH Royal Institute of Technology
, 100 44 Stockholm, Sweden
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P. Dürrenfeld
;
P. Dürrenfeld
4
Department of Physics, University of Gothenburg
, 412 96 Gothenburg, Sweden
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H. Fulara
;
H. Fulara
4
Department of Physics, University of Gothenburg
, 412 96 Gothenburg, Sweden
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M. Ranjbar;
M. Ranjbar
4
Department of Physics, University of Gothenburg
, 412 96 Gothenburg, Sweden
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J. Åkerman
J. Åkerman
4
Department of Physics, University of Gothenburg
, 412 96 Gothenburg, Sweden
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the Special Topic on Spin-Orbit Torque (SOT): Materials, Physics and Devices.
Appl. Phys. Lett. 118, 012406 (2021)
Article history
Received:
October 30 2020
Accepted:
December 11 2020
Citation
M. Haidar, H. Mazraati, P. Dürrenfeld, H. Fulara, M. Ranjbar, J. Åkerman; Compositional effect on auto-oscillation behavior of xFex/Pt spin Hall nano-oscillators. Appl. Phys. Lett. 4 January 2021; 118 (1): 012406. https://doi.org/10.1063/5.0035697
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