Investigation of spin orbit torque driven dynamics in ferromagnetic heterostructures
Abstract
We use time-resolved (TR) measurements based on the polar magneto-optical Kerr effect (MOKE) to study the magnetization dynamics excited by spin orbit torques in Py (Permalloy)/Pt and Ta/CoFeB bilayers. The analysis reveals that the field-like (FL) spin orbit torque (SOT) dominates the amplitude of the first oscillation cycle of the magnetization precession and the damping-like (DL) torque determines the final steady-state magnetization. In our bilayer samples, we have extracted the effective fields, hFL and hDL, of the two SOTs from the time-resolved magnetization oscillation spectrum. The extracted values are in good agreement with those extracted from time-integrated DCMOKE measurements, suggesting that the SOTs do not change at high frequencies. We also find that the amplitude ratio of the first oscillation to steady state is linearly proportional to the ratio hFL/hDL. Here, the first oscillation amplitude is inversely proportional to, whereas the steady state value is independent of, the applied external field along the current direction.
- Authors:
-
- Univ. of Delaware, Newark, DE (United States)
- Publication Date:
- Research Org.:
- Univ. of Delaware, Newark, DE (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1886863
- Alternate Identifier(s):
- OSTI ID: 1703554
- Grant/Contract Number:
- SC0016380; DMR -1624976; DE -SC0016380
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Magnetism and Magnetic Materials
- Additional Journal Information:
- Journal Volume: 503; Journal ID: ISSN 0304-8853
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Magneto-Kerr effect; spin orbit coupling; spin orbit torque; spin dynamics; time resolved MOKE; damping-like torque
Citation Formats
Zhou, Xinran, Chen, Hang, Ou, Yu-Sheng, Wang, Tao, Barri, Rasoul, Kannan, Harsha, Xiao, John Q., and Doty, Matthew F. Investigation of spin orbit torque driven dynamics in ferromagnetic heterostructures. United States: N. p., 2019.
Web. doi:10.1016/j.jmmm.2019.166211.
Zhou, Xinran, Chen, Hang, Ou, Yu-Sheng, Wang, Tao, Barri, Rasoul, Kannan, Harsha, Xiao, John Q., & Doty, Matthew F. Investigation of spin orbit torque driven dynamics in ferromagnetic heterostructures. United States. https://doi.org/10.1016/j.jmmm.2019.166211
Zhou, Xinran, Chen, Hang, Ou, Yu-Sheng, Wang, Tao, Barri, Rasoul, Kannan, Harsha, Xiao, John Q., and Doty, Matthew F. Wed .
"Investigation of spin orbit torque driven dynamics in ferromagnetic heterostructures". United States. https://doi.org/10.1016/j.jmmm.2019.166211. https://www.osti.gov/servlets/purl/1886863.
@article{osti_1886863,
title = {Investigation of spin orbit torque driven dynamics in ferromagnetic heterostructures},
author = {Zhou, Xinran and Chen, Hang and Ou, Yu-Sheng and Wang, Tao and Barri, Rasoul and Kannan, Harsha and Xiao, John Q. and Doty, Matthew F.},
abstractNote = {We use time-resolved (TR) measurements based on the polar magneto-optical Kerr effect (MOKE) to study the magnetization dynamics excited by spin orbit torques in Py (Permalloy)/Pt and Ta/CoFeB bilayers. The analysis reveals that the field-like (FL) spin orbit torque (SOT) dominates the amplitude of the first oscillation cycle of the magnetization precession and the damping-like (DL) torque determines the final steady-state magnetization. In our bilayer samples, we have extracted the effective fields, hFL and hDL, of the two SOTs from the time-resolved magnetization oscillation spectrum. The extracted values are in good agreement with those extracted from time-integrated DCMOKE measurements, suggesting that the SOTs do not change at high frequencies. We also find that the amplitude ratio of the first oscillation to steady state is linearly proportional to the ratio hFL/hDL. Here, the first oscillation amplitude is inversely proportional to, whereas the steady state value is independent of, the applied external field along the current direction.},
doi = {10.1016/j.jmmm.2019.166211},
journal = {Journal of Magnetism and Magnetic Materials},
number = ,
volume = 503,
place = {United States},
year = {Wed Nov 27 00:00:00 EST 2019},
month = {Wed Nov 27 00:00:00 EST 2019}
}
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