Femtosecond photocurrents at the FeRh/Pt interface
Abstract
Femtosecond laser excitations of FeRh/Pt bilayers launch an ultrafast pulse of electric photocurrents in the Pt-layer and subsequently result in the emission of electromagnetic radiation in the THz spectral range. Analysis of the THz emission as a function of the polarization of the femtosecond laser pulse, external magnetic field, sample temperature, and sample orientation shows that the photocurrent can emerge due to vertical spin pumping and photo-induced inverse spin–orbit torque at the FeRh/Pt interface. Additionally, the vertical spin pumping from FeRh into Pt does not depend on the polarization of light and originates from ultrafast laser-induced demagnetization of the ferromagnetic phase of FeRh. The photo-induced inverse spin–orbit torque at the FeRh/Pt interface can be described in terms of a helicity-dependent effect of circularly polarized light on the magnetization of the ferromagnetic FeRh and the subsequent generation of a photocurrent.
- Authors:
-
[1];
- Univ. of California San Diego, La Jolla, CA (United States). Center for Memory and Recording Research; National Inst. of Technology, Andhra Pradesh (India)
- Radboud Univ., Nijmegen (Netherlands). Inst. for Molecules and Materials
- Univ. of California San Diego, La Jolla, CA (United States). Center for Memory and Recording Research
- Radboud Univ., Nijmegen (Netherlands). Inst. for Molecules and Materials; Lancaster Univ. (United Kingdom)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); European Research Council (ERC)
- OSTI Identifier:
- 1852549
- Alternate Identifier(s):
- OSTI ID: 1671147
- Grant/Contract Number:
- SC0018237; 713481; 856538; 852050
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 117; Journal Issue: 14; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics
Citation Formats
Medapalli, R., Li, G., Patel, Sheena K. K., Mikhaylovskiy, R. V., Rasing, Th., Kimel, A. V., and Fullerton, E. E. Femtosecond photocurrents at the FeRh/Pt interface. United States: N. p., 2020.
Web. doi:10.1063/5.0026252.
Medapalli, R., Li, G., Patel, Sheena K. K., Mikhaylovskiy, R. V., Rasing, Th., Kimel, A. V., & Fullerton, E. E. Femtosecond photocurrents at the FeRh/Pt interface. United States. https://doi.org/10.1063/5.0026252
Medapalli, R., Li, G., Patel, Sheena K. K., Mikhaylovskiy, R. V., Rasing, Th., Kimel, A. V., and Fullerton, E. E. Mon .
"Femtosecond photocurrents at the FeRh/Pt interface". United States. https://doi.org/10.1063/5.0026252. https://www.osti.gov/servlets/purl/1852549.
@article{osti_1852549,
title = {Femtosecond photocurrents at the FeRh/Pt interface},
author = {Medapalli, R. and Li, G. and Patel, Sheena K. K. and Mikhaylovskiy, R. V. and Rasing, Th. and Kimel, A. V. and Fullerton, E. E.},
abstractNote = {Femtosecond laser excitations of FeRh/Pt bilayers launch an ultrafast pulse of electric photocurrents in the Pt-layer and subsequently result in the emission of electromagnetic radiation in the THz spectral range. Analysis of the THz emission as a function of the polarization of the femtosecond laser pulse, external magnetic field, sample temperature, and sample orientation shows that the photocurrent can emerge due to vertical spin pumping and photo-induced inverse spin–orbit torque at the FeRh/Pt interface. Additionally, the vertical spin pumping from FeRh into Pt does not depend on the polarization of light and originates from ultrafast laser-induced demagnetization of the ferromagnetic phase of FeRh. The photo-induced inverse spin–orbit torque at the FeRh/Pt interface can be described in terms of a helicity-dependent effect of circularly polarized light on the magnetization of the ferromagnetic FeRh and the subsequent generation of a photocurrent.},
doi = {10.1063/5.0026252},
journal = {Applied Physics Letters},
number = 14,
volume = 117,
place = {United States},
year = {Mon Oct 05 00:00:00 EDT 2020},
month = {Mon Oct 05 00:00:00 EDT 2020}
}
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