Year: 2020
Type: article
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.
Source: Applied Physics Letters
DOI: 10.1063/5.0026252
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: SOLITON FORMATION AND TOPOLOGY MANIPULATION OF COUPLED SPINS VIA ULTRAFAST RE-MAGNETIZATION, Three-dimensional magnetization textures: Discovery and control on the nanoscale, Cold Opto-Magnetic Switching at the Edge of Time, Spintronic-Photonic Integrated Circuit platform for novel Electronics
OpenAlex ID: W3092425042