Spin Seebeck effect and spin Hall magnetoresistance at high temperatures for a Pt/yttrium iron garnet hybrid structure.

Based on unique experimental setups, the temperature dependences of the longitudinal spin Seebeck effect (LSSE) and spin Hall magnetoresistance (SMR) of the Pt/yttrium iron garnet (Pt/YIG) hybrid structure are determined in a wide temperature range up to the Curie temperature of YIG. From a theoretical analysis of the experimental relationship between the SMR and temperature, the spin mixing conductance of the Pt/YIG interface is deduced as a function of temperature. Adopting the deduced spin mixing conductance, the temperature dependence of the LSSE is well reproduced based on the magnon spin current theory. Our research sheds new light on the controversy about the theoretical models for the LSSE.

[1]  Eiji Saitoh,et al.  Theory of spin Hall magnetoresistance , 2013, 1302.1352.

[2]  Takashi Kikkawa,et al.  Critical suppression of spin Seebeck effect by magnetic fields , 2015, 1503.05764.

[3]  M. Guillot,et al.  Specific heat in Erbium and Yttrium Iron garnet crystals , 1981 .

[4]  S. Ubizskii,et al.  Induced Absorption in Gadolinium Gallium Garnet Irradiated by High Energy235U Ions , 2010 .

[5]  W. Marsden.  I and J , 2012 .

[6]  Bihong Lin,et al.  Optimum design of a nanoscale spin-Seebeck power device. , 2015, Nanoscale.

[7]  D. Matatagui,et al.  A magnonic gas sensor based on magnetic nanoparticles. , 2015, Nanoscale.

[8]  Jiang Xiao,et al.  Magnon, phonon, and electron temperature profiles and the spin Seebeck effect in magnetic insulator/normal metal hybrid structures , 2013, 1306.4292.

[9]  H. Jaffrès,et al.  Spin pumping and inverse spin Hall effect in platinum: the essential role of spin-memory loss at metallic interfaces. , 2013, Physical review letters.

[10]  R. Gross,et al.  Spin Hall magnetoresistance induced by a nonequilibrium proximity effect. , 2012, Physical review letters.

[11]  Jiang Xiao,et al.  Theory of magnon-driven spin Seebeck effect , 2010, 1009.0318.

[12]  F. Casanova,et al.  Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt , 2014, 1407.4770.

[13]  R. J. Elliott,et al.  Theory of the Effect of Spin-Orbit Coupling on Magnetic Resonance in Some Semiconductors , 1954 .

[14]  R. Aiyar,et al.  Spin wave stiffness constants in some ferrimagnetics , 1987 .

[15]  Sergio M. Rezende,et al.  Spin pumping and anisotropic magnetoresistance voltages in magnetic bilayers: Theory and experiment , 2011 .

[16]  Joseph P. Heremans,et al.  Magnon thermal mean free path in yttrium iron garnet , 2014 .

[17]  A. Thomas,et al.  Local charge and spin currents in magnetothermal landscapes. , 2011, Physical review letters.

[18]  A. Sukhov,et al.  Longitudinal spin current induced by a temperature gradient in a ferromagnetic insulator , 2014, 1402.6899.

[19]  T. Kikkawa,et al.  Spin Hall magnetoresistance at high temperatures , 2015 .

[20]  Wenxin Wang,et al.  Joule heating-induced coexisted spin Seebeck effect and spin Hall magnetoresistance in the platinum/Y3Fe5O12 structure , 2014 .

[21]  A. Clark,et al.  Elastic Constants of Single-Crystal YIG , 1961 .

[22]  D. Lacklison,et al.  Absorption spectra of Y 3 Fe 5 O 12 (YIG) and Y 3 Ga 5 O 12 : Fe 3+ , 1974 .

[23]  Andy Thomas,et al.  Seebeck effect in magnetic tunnel junctions. , 2011, Nature materials.

[24]  Weiwei Lin,et al.  Giant spin-dependent thermoelectric effect in magnetic tunnel junctions. , 2012, Nature communications.

[25]  C. S. Guenzer,et al.  Spin-wave resonance studies on chemical vapor deposited YIG films , 1973 .

[26]  F. Pan,et al.  Antiferromagnet-controlled spin current transport in SrMnO 3 / Pt hybrids , 2014 .

[27]  Philipp Pirro,et al.  Role of bulk-magnon transport in the temporal evolution of the longitudinal spin-Seebeck effect , 2014 .

[28]  A. Hofmeister.  Thermal diffusivity of garnets at high temperature , 2006 .

[29]  Jiang Xiao,et al.  Erratum: Theory of magnon-driven spin Seebeck effect [Phys. Rev. B 81 , 214418 (2010)] , 2010 .

[30]  T. Kikkawa,et al.  Longitudinal spin Seebeck effect free from the proximity Nernst effect. , 2012, Physical review letters.

[31]  S. Maekawa,et al.  Observation of longitudinal spin-Seebeck effect in magnetic insulators , 2010 .

[32]  Sergio M. Rezende,et al.  Magnon spin-current theory for the longitudinal spin-Seebeck effect , 2014 .

[33]  Eiji Saitoh,et al.  Enhanced dc spin pumping into a fluctuating ferromagnet near T C , 2014, 1404.0768.

[34]  Jiang Xiao,et al.  Experimental test of the spin mixing interface conductivity concept. , 2013, Physical review letters.

[35]  R. Gross,et al.  Temperature dependent spin transport properties of platinum inferred from spin Hall magnetoresistance measurements , 2014, 1401.7787.

[36]  A. Serga,et al.  Direct measurement of magnon temperature: new insight into magnon-phonon coupling in magnetic insulators. , 2013, Physical review letters.

[37]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[38]  Mannan Ali,et al.  Temperature dependence of spin Hall magnetoresistance in thin YIG/Pt films , 2014 .