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Title: Characteristic length scale of the magnon accumulation in Fe{sub 3}O{sub 4}/Pt bilayer structures by incoherent thermal excitation

Abstract

The dependence of Spin Seebeck effect (SSE) with the thickness of the magnetic materials is studied by means of incoherent thermal excitation. The SSE voltage signal in Fe{sub 3}O{sub 4}/Pt bilayer structure increases with the magnetic material thickness up to 100 nm, approximately, showing signs of saturation for larger thickness. This dependence is well described in terms of a spin current pumped in the platinum film by the magnon accumulation in the magnetic material. The spin current is generated by a gradient of temperature in the system and detected by the Pt top contact by means of inverse spin Hall effect. Calculations in the frame of the linear response theory adjust with a high degree of accuracy the experimental data, giving a thermal length scale of the magnon accumulation (Λ) of 17 ± 3 nm at 300 K and Λ = 40 ± 10 nm at 70 K.

Authors:
; ;  [1];  [2];  [3];  [4];  [5];  [2]; ;  [1];  [2];  [2]
  1. Instituto de Nanociencia de Aragón, Universidad de Zaragoza, E-50018 Zaragoza (Spain)
  2. (Spain)
  3. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
  4. (Japan)
  5. Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza (Spain)
Publication Date:
OSTI Identifier:
22590581
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRIC POTENTIAL; EXCITATION; FERRITES; HALL EFFECT; IRON OXIDES; LAYERS; LENGTH; SEEBECK EFFECT; SIGNALS; SPIN; THICKNESS

Citation Formats

Anadón, A., E-mail: anadonb@unizar.es, Lucas, I., Morellón, L., Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, Ramos, R., Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577, Algarabel, P. A., Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Ibarra, M. R., Aguirre, M. H., Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, and Laboratorio de Microscopías avanzadas, Universidad de Zaragoza, 50018 Zaragoza. Characteristic length scale of the magnon accumulation in Fe{sub 3}O{sub 4}/Pt bilayer structures by incoherent thermal excitation. United States: N. p., 2016. Web. doi:10.1063/1.4955031.
Anadón, A., E-mail: anadonb@unizar.es, Lucas, I., Morellón, L., Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, Ramos, R., Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577, Algarabel, P. A., Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Ibarra, M. R., Aguirre, M. H., Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, & Laboratorio de Microscopías avanzadas, Universidad de Zaragoza, 50018 Zaragoza. Characteristic length scale of the magnon accumulation in Fe{sub 3}O{sub 4}/Pt bilayer structures by incoherent thermal excitation. United States. doi:10.1063/1.4955031.
Anadón, A., E-mail: anadonb@unizar.es, Lucas, I., Morellón, L., Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, Ramos, R., Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577, Algarabel, P. A., Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas, 50009 Zaragoza, Ibarra, M. R., Aguirre, M. H., Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, and Laboratorio de Microscopías avanzadas, Universidad de Zaragoza, 50018 Zaragoza. Mon . "Characteristic length scale of the magnon accumulation in Fe{sub 3}O{sub 4}/Pt bilayer structures by incoherent thermal excitation". United States. doi:10.1063/1.4955031.
@article{osti_22590581,
title = {Characteristic length scale of the magnon accumulation in Fe{sub 3}O{sub 4}/Pt bilayer structures by incoherent thermal excitation},
author = {Anadón, A., E-mail: anadonb@unizar.es and Lucas, I. and Morellón, L. and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza and Ramos, R. and Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577 and Algarabel, P. A. and Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Científicas, 50009 Zaragoza and Ibarra, M. R. and Aguirre, M. H. and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza and Laboratorio de Microscopías avanzadas, Universidad de Zaragoza, 50018 Zaragoza},
abstractNote = {The dependence of Spin Seebeck effect (SSE) with the thickness of the magnetic materials is studied by means of incoherent thermal excitation. The SSE voltage signal in Fe{sub 3}O{sub 4}/Pt bilayer structure increases with the magnetic material thickness up to 100 nm, approximately, showing signs of saturation for larger thickness. This dependence is well described in terms of a spin current pumped in the platinum film by the magnon accumulation in the magnetic material. The spin current is generated by a gradient of temperature in the system and detected by the Pt top contact by means of inverse spin Hall effect. Calculations in the frame of the linear response theory adjust with a high degree of accuracy the experimental data, giving a thermal length scale of the magnon accumulation (Λ) of 17 ± 3 nm at 300 K and Λ = 40 ± 10 nm at 70 K.},
doi = {10.1063/1.4955031},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 1,
volume = 109,
place = {United States},
year = {2016},
month = {7}
}