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Spin Superfluidity and Long-Range Transport in Thin-Film Ferromagnets
Norwegian University of Science and Technology, Norway.
Norwegian University of Science and Technology, Norway.ORCID-id: 0000-0001-5551-8980
Norwegian University of Science and Technology, Norway.
2015 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, artikel-id 237201Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In ferromagnets, magnons may condense into a single quantum state. Analogous to superconductors,this quantum state may support transport without dissipation. Recent works suggest that longitudinal spintransport through a thin-film ferromagnet is an example of spin superfluidity. Although intriguing, thistantalizing picture ignores long-range dipole interactions; here, we demonstrate that such interactionsdramatically affect spin transport. In single-film ferromagnets,“spin superfluidity”only exists at lengthscales (a few hundred nanometers in yttrium iron garnet) somewhat larger than the exchange length. Overlonger distances, dipolar interactions destroy spin superfluidity. Nevertheless, we predict the reemergenceof spin superfluidity in trilayer ferromagnet-normal metal-ferromagnet films that are∼1μm in size. Suchsystems also exhibit other types of long-range spin transport in samples that are several micrometers in size.

Ort, förlag, år, upplaga, sidor
2015. Vol. 115, artikel-id 237201
Nationell ämneskategori
Den kondenserade materiens fysik
Forskningsämne
Fysik, Kondenserade materians fysik
Identifikatorer
URN: urn:nbn:se:lnu:diva-63796DOI: 10.1103/PhysRevLett.115.237201OAI: oai:DiVA.org:lnu-63796DiVA, id: diva2:1095291
Tillgänglig från: 2017-05-12 Skapad: 2017-05-12 Senast uppdaterad: 2018-05-17Bibliografiskt granskad

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