SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Spintronics (other effects)

MA 20.8: Vortrag

Dienstag, 28. März 2023, 17:00–17:15, HSZ 401

Spin-caloritronics using spin-polarized scanning tunneling microscopy — •Cody Friesen and Roland Wiesendanger — Department of Physics, University of Hamburg, Hamburg, Germany

The study and control of magneto- and thermoelectric effects have long been of fundamental importance, from the perspectives of both basic condensed matter research and technological development. More recently, driven by the discovery of the spin-Seebeck effect, a growing amount of research is being done at the intersection of these transport channels; a field known as spin-caloritronics [1]. The possible applications of these effects, e.g. the efficient conversion of waste heat into spin or charge currents, or the magnetic control of heat transfer on the atomic scale, have far-reaching implications for future technology.

Using spin-polarized scanning tunneling microscope (SP-STM) we have investigated magneto-Seebeck tunneling, i.e. the spin-dependent tunneling of electrons across a magnetic tunnel junction driven by a temperature gradient [2]. By scanning a (relatively) heated magnetic probe tip in tunneling contact with a magnetic sample, at cryogenic temperatures the spin-resolved thermopower of the junction can be resolved with atomic-scale lateral resolution [3,4].

In this talk I will present the experimental requirements, challenges, and advantages of using SP-STM for studies of spin-caloritronics. Following this, the expansion of this approach to the measurement of thermal spin-transfer torque, as well as further development of SP-STM as a tool for spin-caloritronic studies, will be discussed.