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    Rights statement: Copyright 2022 American Institute of Physics. The following article appeared in Applied Physics Letters, 117, 2020 and may be found at https://aip.scitation.org/doi/full/10.1063/5.0026252 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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Femtosecond photocurrents at the FeRh/Pt interface

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Article number142406
<mark>Journal publication date</mark>8/10/2020
<mark>Journal</mark>Applied Physics Letters
Issue number14
Volume117
Number of pages6
Publication StatusPublished
Early online date8/10/20
<mark>Original language</mark>English

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).

Bibliographic note

Copyright 2022 American Institute of Physics. The following article appeared in Applied Physics Letters, 117, 2020 and may be found at https://aip.scitation.org/doi/full/10.1063/5.0026252 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.