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Femtosecond photocurrents at the FeRh/Pt interface
Authors
E.E. Fullerton
A.V. Kimel
+5 more
G. Li
R. Medapalli
R. Mikhaylovskiy
S.K.K. Patel
T.H.M. Rasing
Publication date
1 January 2020
Publisher
'AIP Publishing'
Doi
Cite
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. 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. © 2020 Author(s)
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Last time updated on 29/05/2021
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oai:eprints.lancs.ac.uk:171174
Last time updated on 08/06/2022
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Last time updated on 21/04/2021