Journal article
Nonlocal Drag of Magnons in a Ferromagnetic Bilayer
Physical review letters, Vol.116(23), pp.237202-237202
06/10/2016
DOI: 10.1103/PhysRevLett.116.237202
PMID: 27341254
Abstract
Quantized spin waves, or magnons, in a magnetic insulator are assumed to interact weakly with the surroundings, and to flow with little dissipation or drag, producing exceptionally long diffusion lengths and relaxation times. In analogy to Coulomb drag in bilayer two-dimensional electron gases, in which the contribution of the Coulomb interaction to the electric resistivity is studied by measuring the interlayer resistivity (transresistivity), we predict a nonlocal drag of magnons in a ferromagnetic bilayer structure based on semiclassical Boltzmann equations. Nonlocal magnon drag depends on magnetic dipolar interactions between the layers and manifests in the magnon current transresistivity and the magnon thermal transresistivity, whereby a magnon current in one layer induces a chemical potential gradient and/or a temperature gradient in the other layer. The largest drag effect occurs when the magnon current flows parallel to the magnetization; however, for oblique magnon currents a large transverse current of magnons emerges. We examine the effect for practical parameters, and find that the predicted induced temperature gradient is readily observable.
Details
- Title: Subtitle
- Nonlocal Drag of Magnons in a Ferromagnetic Bilayer
- Creators
- Tianyu Liu - University of IowaG Vignale - University of MissouriMichael E Flatté - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physical review letters, Vol.116(23), pp.237202-237202
- DOI
- 10.1103/PhysRevLett.116.237202
- PMID
- 27341254
- NLM abbreviation
- Phys Rev Lett
- ISSN
- 0031-9007
- eISSN
- 1079-7114
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation, award: DMR-1420451; DOI: 10.13039/100000183, name: Army Research Office
- Language
- English
- Date published
- 06/10/2016
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984199738502771
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