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Spin heat accumulation and spin-dependent temperatures in nanopillar spin valves

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journal contribution
posted on 11.10.2018, 14:22 by Fasil Dejene, J. Flipse, G.E.W. Bauer, B.J. van Wees
Since the discovery of the giant magnetoresistance effect1,2 the intrinsic angular momentum of the electron has opened up new spin-based device concepts. Our present understanding of the coupled transport of charge, spin and heat relies on the two-channel model for spin-up and spin-down electrons having equal temperatures. Here we report the observation of different (effective) temperatures for the spin-up and spin-down electrons in a nanopillar spin valve subject to a heat current. By three-dimensional finite element modelling3 of our devices for varying thickness of the non-magnetic layer, spin heat accumulations (the difference of the spin temperatures) of 120 mK and 350 mK are extracted at room temperature and 77 K, respectively, which is of the order of 10% of the total temperature bias over the nanopillar. This technique uniquely allows the study of inelastic spin scattering at low energies and elevated temperatures, which is not possible by spectroscopic methods.

Funding

This work is part of the research programme of the Foundation for Fundamental Research on Matter (FOM) and supported by NanoLab NL, EU FP7 ICT Grant No. 251759 MACALO, JSPS Grand-in-Aid for Scientific Research A No. 25247056, Deutsche Forschungsgemeinschaft (DFG) Priority Programme SPP 1538 'Spin-Caloric Transport' and the Zernike Institute for Advanced Materials.

History

School

  • Science

Department

  • Physics

Published in

Nature Physics

Volume

9

Issue

10

Pages

636 - 639

Citation

DEJENE, F.K. ... et al, 2013. Spin heat accumulation and spin-dependent temperatures in nanopillar spin valves. Nature Physics, 9 (10), pp.636-639.

Publisher

Nature Publishing Group © Macmillan Publishers Limited.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2013

Notes

This paper was published in the journal Nature Physics and the definitive published version is available at https://doi.org/10.1038/nphys2743.

ISSN

1745-2473

eISSN

1745-2481

Language

en

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