Topological excitations in a kagome magnet

Datum

17.08.2015

Zeit

13:30 - 14:30

Sprecher

Dr. Manuel Pereiro

Zugehörigkeit

Materials Theory Department of Physics and Astronomy, Uppsala University Sweden

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Grit Rötzer

Beschreibung

Currently, the research on magnetic skyrmions (nanoscale whirling spin configurations) holds promise as information carries in ultradense memory and logic devices. In addition, extremely low spin-polarized currents are needed to move them. Using an atomistic spin dynamics method based on the Landau–Lifshitz–Gilbert equation, we show that a kagome magnet, with Heisenberg and Dzyaloshinskii–Moriya interactions, causes non-trivial topological and chiral magnetic properties. We also find that under special circumstances, skyrmions emerge as excitations, having stability even at room temperature. Chiral magnonic edge states of a kagome magnet offer, in addition, a promising way to create, control and manipulate skyrmions. This has potential for applications in spintronics, that is, for information storage or as logic devices. We also found that collisions between these particle-like excitations are elastic at very low temperature in the skyrmion-skyrmion channel, albeit without mass-conservation. Nevertheless, Skyrmion–antiskyrmion collisions were found to be more complex, where annihilation and creation of these objects have a distinct non-local nature. .

Links

• Seminars at the IFW

Letztmalig verändert: 17.08.2015, 09:35:54