Magnon Mediated Domain Wall Heat Conductance in Ferromagnetic Wires

Author

Peng Yan ; Bauer, Gerrit E. W.

Author_Institution

Kavli Inst. of Nanosci., Delft Univ. of Technol., Delft, Netherlands

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

3109

Lastpage

3112

Abstract

A theoretical study of magnon-mediated heat transport in electrically insulating 1D ferromagnetic wires containing a domain wall is presented. In the regime of validity of continuum micromagnetism a domain wall is found to have no effect on the heat conductance. However, spin waves are found to be reflected by domain walls with widths of a few lattice spacings, which is associated with emergence of an additional spin wave bound state. We also discuss the role of dipolar interactions in high dimensions to generalize the argument in our previous work. The resulting reduction of the heat conductance due to a DW should be significant for thin wires of Yttrium Iron Garnet with sharply defined magnetic domains.

Keywords

bound states; ferromagnetic materials; garnets; heat conduction; magnetic domain walls; magnetocaloric effects; magnons; micromagnetics; spin waves; yttrium compounds; YIG; continuum micromagnetism; dipolar interactions; electrically insulating 1D ferromagnetic wires; heat conductance reduction; lattice spacings; magnon mediated domain wall heat conductance; magnon-mediated heat transport; sharply defined magnetic domains; spin wave bound state; thin wires; yttrium iron garnet; Anisotropic magnetoresistance; Heating; Lattices; Magnetic domain walls; Magnetic domains; Mathematical model; Wires; Bound states; dipolar interaction; domain wall; heat conductance; spin waves;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2249577

Filename

6559056