Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Focus Session: Spin Current Devices

MA 32.4: Topical Talk

Donnerstag, 14. März 2013, 11:00–11:30, H10

Interaction between spin waves and magnetic domain walls in insulating ferromagnets — •Peng Yan — Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

The interplay between spin waves (SWs) and magnetic domain walls (DWs) leads to very rich physics. On one hand, the injection of SWs through a DW tends to drive the DW moving against the SW propagation direction. The mechanism is identified as a magnonic spin transfer torque which is the counterpart of its electronic version [1]. On the other hand, the DW under a static magnetic field can propagate along a dissipationless nanowire through SW emission (or pumping), since SWs carry away both energy and angular momentum [2]. The opposite effect, viz. the modulation of the magnon-mediated heat current by a domain wall is also investigated [3]. In the regime of validity of continuum micromagnetism, a DW is found to have no effect on the heat conductance. However, SWs are found to be reflected by DWs with widths of a few lattice spacings, which is associated with emergence of an additional spin wave bound state. The resulting DW heat conductance should be significant for thin films of yttrium iron garnet with sharply defined magnetic domains.

[1] P. Yan et al., PRL 107, 177207 (2011).

[2] X.S. Wang, P. Yan et al., PRL 109, 167209 (2012).

[3] P. Yan and G.E.W. Bauer, PRL 109, 087202 (2012).