Quantification of the interfacial and bulk contributions to the longitudinal spin Seebeck effect

Jiménez-Cavero, P. ; Lucas, I. (Universidad de Zaragoza) ; Bugallo, D. ; López-Bueno, C. ; Ramos, R. ; Algarabel, P.A. ; Ibarra, M.R. (Universidad de Zaragoza) ; Rivadulla, F. ; Morellón, L. (Universidad de Zaragoza)

Resumen: We report the disentanglement of bulk and interfacial contributions to the thermally excited magnon spin current in the spin Seebeck effect under static heating. For this purpose, we have studied the dependence of the inverse spin Hall voltage and the thermal conductivity on the magnetic layer thickness. Knowledge of these quantities allows us to take into account the influence of both sources of thermal spin current in the analysis of the voltage dependence. The magnetic layer thickness modulates the relative magnitude of the involved thermal drops for a fixed total thermal difference throughout the sample. In the end, we attain the separate contributions of both sources of thermal spin current - bulk and interfacial - and obtain the value of the thermal magnon accumulation length scale in maghemite, which we find to be 29(1) nm. According to our results, bulk magnon accumulation dominates the spin Seebeck effect in our studied range of thicknesses, but the interfacial component is by no means negligible.

Idioma: Inglés

DOI: 10.1063/5.0038192

Año: 2021

Publicado en: Applied Physics Letters 118, 9 (2021), 092404 [10 pp.]
ISSN: 0003-6951

Factor impacto JCR: 3.971 (2021)

Categ. JCR: PHYSICS, APPLIED rank: 50 / 161 = 0.311 (2021) - Q2 - T1

Factor impacto CITESCORE: 6.6 - Physics and Astronomy (Q1)

Factor impacto SCIMAGO: 1.025 - Physics and Astronomy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E26
Financiación: info:eu-repo/grantAgreement/ES/MEC/FPU014-02546
Financiación: info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2019-104150RB-I00
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-51982-C2-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2016-80762-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-82970-C2-R

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)