Abstract
In recent years, new spin-dependent thermal effects have been discovered in ferromagnets, stimulating a growing interest in spin caloritronics, a field that exploits the interaction between spin and heat currents1,2. Amongst the most intriguing phenomena is the spin Seebeck effect3,4,5, in which a thermal gradient gives rise to spin currents that are detected through the inverse spin Hall effect6,7,8. Non-magnetic materials such as graphene are also relevant for spin caloritronics, thanks to efficient spin transport9,10,11, energy-dependent carrier mobility and unique density of states12,13. Here, we propose and demonstrate that a carrier thermal gradient in a graphene lateral spin valve can lead to a large increase of the spin voltage near to the graphene charge neutrality point. Such an increase results from a thermoelectric spin voltage, which is analogous to the voltage in a thermocouple and that can be enhanced by the presence of hot carriers generated by an applied current14,15,16,17. These results could prove crucial to drive graphene spintronic devices and, in particular, to sustain pure spin signals with thermal gradients and to tune the remote spin accumulation by varying the spin-injection bias.
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References
Johnson, M. & Silsbee, R. H. Thermodynamic analysis of interfacial transport and of the thermomagnetoelectric system. Phys. Rev. B 35, 4959–4972 (1987).
Bauer, G. E. W., Saitoh, E. & van Wees, B. J. Spin caloritronics. Nat. Mater. 11, 391–399 (2012).
Uchida, K. et al. Observation of the spin Seebeck effect. Nature 455, 778–781 (2008).
Uchida, K. et al. Spin Seebeck insulator. Nat. Mater. 9, 894–897 (2010).
Jaworski, C. M. et al. Observation of the spin-Seebeck effect in a ferromagnetic semiconductor. Nat. Mater. 9, 898–903 (2010).
Valenzuela, S. O. & Tinkham, M. Direct electronic measurement of the spin Hall effect. Nature 442, 176–179 (2006).
Saitoh, E., Ueda, M. & Miyajima, H. Conversion of spin current into charge current at room temperature: inverse spin-Hall effect. Appl. Phys. Lett. 88, 182509 (2006).
Sinova, J., Valenzuela, S. O., Wunderlich, J., Back, C. H. & Jungwirth, T. Spin Hall effects. Rev. Mod. Phys. 87, 1213–1259 (2015).
Tombros, N., Jozsa, C., Popinciuc, M., Jonkman, H. T. & van Wees, B. J. Electronic spin transport and spin precession in single graphene layers at room temperature. Nature 448, 571–574 (2007).
Han, W., Kawakami, R. K., Gmitra, M. & Fabian, J. Graphene spintronics. Nat. Nanotech. 9, 794–807 (2014).
Roche, S. & Valenzuela, S. O. Graphene spintronics: puzzling controversies and challenges for spin manipulation. J. Phys. D. Appl. Phys. 47, 094011 (2014).
Castro Neto, A. H., Guinea, F., Peres, N. M. R., Novoselov, K. S. & Geim, A. K. The electronic properties of graphene. Rev. Mod. Phys. 81, 109–162 (2009).
Vera-Marun, I. J., Ranjan, V. & van Wees, B. J. Nonlinear detection of spin currents in graphene with non-magnetic electrodes. Nat. Phys. 8, 313–316 (2012).
Berciaud, S. et al. Electron and optical phonon temperatures in electrically biased graphene. Phys. Rev. Lett. 104, 227401 (2010).
Betz, A. C. et al. Hot electron cooling by acoustic phonons in graphene. Phys. Rev. Lett. 109, 056805 (2012).
Betz, A. C. et al. Supercollision cooling in undoped graphene. Nat. Phys. 9, 109–112 (2012).
Sierra, J. F., Neumann, I., Costache, M. V. & Valenzuela, S. O. Hot-carrier Seebeck effect: Diffusion and remote detection of hot carriers in graphene. Nano. Lett. 15, 4000–4005 (2015).
Zuev, Y. M., Chang, W. & Kim, P. Thermoelectric and magnetothermoelectric transport measurements of graphene. Phys. Rev. Lett. 102, 096807 (2009).
Wei, P., Bao, W., Pu, Y., Lau, C. N. & Shi, J. Anomalous thermoelectric transport of Dirac particles in graphene. Phys. Rev. Lett. 102, 166808 (2009).
Johnson, M. & Silsbee, R. H. Interfacial charge–spin coupling: injection and detection of spin magnetization in metals. Phys. Rev. Lett. 55, 1790–1793 (1985).
Valenzuela, S. O. Nonlocal spin detection, spin accumulation and the spin Hall effect. Int. J. Mod. Phys. B 23, 2413–2438 (2009).
Slachter, A., Bakker, F. L., Adam, J.-P. & van Wees, B. J. Thermally driven spin injection from a ferromagnet into a non-magnetic metal. Nat. Phys. 6, 879–882 (2010).
Erekhinsky, M., Casanova, F., Schuller, I. K. & Sharoni, Q. Spin-dependent Seebeck effect in non-local spin valve devices. Appl. Phys. Lett. 100, 212401 (2012).
Song, J. C. W., Reizer, M. Y. & Levitov, L. S. Disorder-assisted electron-phonon scattering and cooling pathways in graphene. Phys. Rev. Lett. 109, 106602 (2012).
Dejene, F. K., Flipse, J., Bauer, G. E. W. & van Wees, B. J. Spin heat accumulation and spin-dependent temperatures in nanopillar spin valves. Nat. Phys. 9, 636–639 (2012).
Han, W. et al. Electron–hole asymmetry of spin injection and transport in single-layer graphene. Phys. Rev. Lett. 102, 137205 (2009).
Neumann, I. Electronic Spin Transport and Thermoelectric Effects in Graphene. PhD thesis, Univ. Autònoma de Barcelona (2014).
Gurram, M., Omar, S. & van Wees, B. J. Bias induced up to 100% spin-injection and detection polarizations in ferromagnet/bilayer-hBN/graphene/hBN heterostructure. Nat. Commun. 8, 248 (2017).
Ingla-Aynés, J., Meijerink, R. J. & van Wees, B. J. Eighty-eight percent directional guiding of spin currents with 90 μm relaxation length in bilayer graphene using carrier drift. Nano. Lett. 16, 4825–4830 (2016).
Kikkawa, J. M. & Awschalom, D. D. Lateral drag of spin coherence in gallium arsenide. Nature 397, 139–141 (1999).
Acknowledgements
We thank D. Torres for help in designing Fig. 1. This research was partially supported by the European Research Council under grant agreement no. 306652 SPINBOUND, by the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 696656 (Graphene Flagship), by the Spanish Ministry of Economy and Competitiveness, MINECO (under contracts no. MAT2013-46785-P, no. MAT2016-75952-R and Severo Ochoa no. SEV-2013-0295), and by the CERCA Programme and the Secretariat for Universities and Research, Knowledge Department of the Generalitat de Catalunya 2014 SGR 56. J.F.S. and M.V.C. acknowledge support from MINECO Juan de la Cierva and Ramón y Cajal programmes, respectively, and J.C. from Generalitat de Catalunya, Beatriu de Pinos programme.
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J.F.S., I.N. and S.O.V. planned the measurements. J.F.S. fabricated the samples and performed the experiments. J.C., B.R. and M.V.C. provided support for the device fabrication and M.V.C. for the measurements. J.F.S. and S.O.V. analysed the data and wrote the manuscript. All authors discussed the results and commented on the manuscript. S.O.V supervised the work.
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Sierra, J.F., Neumann, I., Cuppens, J. et al. Thermoelectric spin voltage in graphene. Nature Nanotech 13, 107–111 (2018). https://doi.org/10.1038/s41565-017-0015-9
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DOI: https://doi.org/10.1038/s41565-017-0015-9
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