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.
Accepted author manuscript, 1.15 MB, PDF document
Available under license: CC BY: Creative Commons Attribution 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Femtosecond photocurrents at the FeRh/Pt interface
AU - Medapalli, R.
AU - Li, G.
AU - Patel, S.K.K.
AU - Mikhaylovskiy, R.V.
AU - Rasing, T.
AU - Kimel, A.V.
AU - Fullerton, E.E.
N1 - 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.
PY - 2020/10/8
Y1 - 2020/10/8
N2 - 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).
AB - 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).
KW - Binary alloys
KW - Femtosecond lasers
KW - Ferromagnetic materials
KW - Ferromagnetism
KW - Iron alloys
KW - Laser pulses
KW - Optical pumping
KW - Photocurrents
KW - Polarization
KW - Spin orbit coupling
KW - Terahertz waves
KW - Circularly polarized light
KW - External magnetic field
KW - Femtoseconds
KW - Ferromagnetic phase
KW - Photo-induced
KW - Sample temperature
KW - Spectral range
KW - Ultrafast pulse
KW - Rhodium alloys
U2 - 10.1063/5.0026252
DO - 10.1063/5.0026252
M3 - Journal article
VL - 117
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 14
M1 - 142406
ER -