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MA: Fachverband Magnetismus

MA 63: Spin: Transport, Orbitronics and Hall Effects III

MA 63.13: Vortrag

Freitag, 20. März 2020, 12:45–13:00, HSZ 403

Spin pumping at the ferromagnetic/paramagnetic phase transition of Fe monolayers — •Evangelos Th. Papaioannou, Camillo Ballani, Christoph Hauser, and Georg Schmidt — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle, Germany

Spin pumping is a powerful method to generate pure spin currents which are a key ingredient in spintronic devices. The microscopic nature of the spin current injection close to the magnetic phase transition is of great interest for future applications of magnetic nano-devices. The effect of spin pumping close to the magnetic phase transition has been only studied so far for paramagnetic insulating- and antiferromagnetic/Pt bilayers. On the contrary here, we show the effect of spin pumping and of inverse spin Hall effect (ISHE) undergoing a ferromagnetic to paramagnetic phase transition. We use ultra-thin Fe layers in Pd /Fe(1.2-1.7 monolayers)/Pd heterostructures with controllable Curie temperature. Temperature-dependent inverse spin Hall effect voltage measurements show that the ISHE signal remains persistent over a relatively wide temperature range above the Curie temperature. We correlate our spin pumping results to the spin correlation length and to the critical exponent of the transition. We discuss how spin pumping due to local magnetic order above the Curie temperature gives new insights into the pumping mechanism and how it can be turned into a simple microwave spin battery.