Spin precession in anisotropic media
Raes, Bart (Institut Català de Nanociència i Nanotecnologia)
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Bonell, Frédéric (Institut Català de Nanociència i Nanotecnologia)
Costache, Marius Vasile. (Institut Català de Nanociència i Nanotecnologia)
Sierra, Juan F. (Institut Català de Nanociència i Nanotecnologia)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)

Fecha:	2017
Resumen:	We generalize the diffusive model for spin injection and detection in nonlocal spin structures to account for spin precession under an applied magnetic field in an anisotropic medium, for which the spin lifetime is not unique and depends on the spin orientation. We demonstrate that the spin precession (Hanle) line shape is strongly dependent on the degree of anisotropy and on the orientation of the magnetic field. In particular, we show that the anisotropy of the spin lifetime can be extracted from the measured spin signal, after dephasing in an oblique magnetic field, by using an analytical formula with a single fitting parameter. Alternatively, after identifying the fingerprints associated with the anisotropy, we propose a simple scaling of the Hanle line shapes at specific magnetic field orientations that results in a universal curve only in the isotropic case. The deviation from the universal curve can be used as a complementary means of quantifying the anisotropy by direct comparison with the solution of our generalized model. Finally, we applied our model to graphene devices and find that the spin relaxation for graphene on silicon oxide is isotropic within our experimental resolution.
Ayudas:	European Commission 308023 European Commission 696656 Ministerio de Economía y Competitividad MAT2013-46785-P Ministerio de Economía y Competitividad MAT2016-75952-R Ministerio de Economía y Competitividad FIS2015-67767-P Ministerio de Economía y Competitividad SEV-2013-0295
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Spin accumulation ; Spin current ; Spin diffusion ; Spin polarization ; Spin relaxation ; Spintronics
Publicado en:	Physical review B, Vol. 95, Issue 8 (February 2017) , art. 85403, ISSN 2469-9969

DOI: 10.1103/PhysRevB.95.085403

Postprint 11 p, 3.3 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
Artículos > Artículos de investigación
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