Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.6: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Antiferromagnetic domain wall motion in the presence of spin-polarized current and temperature gradient — •Olena Gomonay, Kei Yamamoto, and Jairo Sinova — Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany

Antiferromagnets (AF) are promising materials for spintronic applications because they show fast magnetic dynamics and low susceptibility with respect to magnetic fields. Application of AF as information storage devices implies fast and reliable switching between different states. In this presentation we focus on the domain wall motion as a main mechanism of the switching. We consider combined effects of the temperature gradient and spin current on the AF domain wall motion. We demonstrate that spin current splits the effective temperatures of the magnon gas in different domains and thus induces the magnon current equivalent to the thermal one. This mechanism can add to or compete with the entropic mechanism, that results from the temperature gradient. We show that tailoring of the device geometry can enhance or suppress the effective force that sets the AF domain wall into motion. This effect opens a way to manipulate a domain wall position in the presence of temperature gradient.