Robust longitudinal spin-Seebeck effect in Bi-YIG thin films

In recent years, the coupling of magnetic insulators (bismuth-doped yttrium iron garnet, Bi-YIG) with platinum has garnered significant interest in spintronics research due to applicability as spin-current-driven thermoelectric coatings. These coatings bridge the gap between spintronics technologies and thermoelectric materials, providing a novel means of transforming waste heat into electricity. However, there remain questions regarding the origins of the spin-Seebeck effect (SSE) as well as claims that observed effects are a manifestation of magnetic proximity effects, which would induce magnetic behavior in platinum. Herewith we provide support that the voltages observed in the Bi-YIG/Pt films are purely SSE voltages. We reaffirm claims that magnon transport theory provides an ample basis for explaining SSE behavior. Finally, we illustrate the advantages of pulsed-laser deposition, as these Bi-YIG films possess large SSE voltages (even in absence of an external magnetic field), as much as twice those of films fabricated via solution-based methods.

[1]  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.

[2]  L. Bell.  Cooling, Heating, Generating Power, and Recovering Waste Heat with Thermoelectric Systems , 2008, Science.

[3]  Ravi Mahajan,et al.  On-chip cooling by superlattice-based thin-film thermoelectrics. , 2009, Nature nanotechnology.

[4]  S. Maekawa,et al.  Observation of the spin Seebeck effect , 2008, Nature.

[5]  J. B. Youssef,et al.  Comparative measurements of inverse spin Hall effects and magnetoresistance in YIG/Pt and YIG/Ta , 2013, 1302.4416.

[6]  S. V. Dubinko,et al.  Features of the coercivity of strained epitaxial garnet ferrite films , 2005 .

[7]  B. Hillebrands,et al.  Acoustic spin pumping as the origin of the long-range spin Seebeck effect , 2011, 1103.6120.

[8]  D. Rowe.  Thermoelectrics Handbook , 2005 .

[9]  Yasunobu Nakamura,et al.  Spin-current-driven thermoelectric coating. , 2012, Nature materials.

[10]  Y. P. Chen,et al.  Transport magnetic proximity effects in platinum. , 2012, Physical review letters.

[11]  Haitao Xu,et al.  Magnetic properties of YIG doped with cerium and gadolinium ions , 2008 .

[12]  George S. Nolas,et al.  Thermoelectrics: Basic Principles and New Materials Developments , 2001 .

[13]  H Adachi,et al.  Spin Seebeck insulator. , 2010, Nature Materials.

[14]  Sadamichi Maekawa,et al.  Linear-response theory of spin Seebeck effect in ferromagnetic insulators , 2010, 1010.2325.

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

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

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

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

[19]  D D Awschalom,et al.  Spin-seebeck effect: a phonon driven spin distribution. , 2011, Physical review letters.

[20]  H. Goldsmid,et al.  Introduction to Thermoelectricity , 2016 .

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

[22]  Ken-ichi Uchida,et al.  Gigantic enhancement of spin Seebeck effect by phonon drag , 2010, 1010.4600.

[23]  B. Hillebrands,et al.  Long-range spin Seebeck effect and acoustic spin pumping. , 2011, Nature materials.

[24]  B. V. van Wees,et al.  Spin caloritronics. , 2011, Nature materials.

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

[26]  D. D. Awschalom,et al.  Observation of the spin-Seebeck effect in a ferromagnetic semiconductor. , 2010, Nature materials.

[27]  F. Disalvo,et al.  Thermoelectric cooling and power generation , 1999, Science.

[28]  S. Hawkins,et al.  Theory of the Longitudinally Isothermal Ettingshausen Cooler , 1963 .

[29]  Carl Eklund,et al.  National Institute for Standards and Technology , 2009, Encyclopedia of Biometrics.