Time resolved spin Seebeck effect experiments

In this Letter, we present the results of transient thermopower experiments, performed at room temperature on yttrium iron garnet/platinum bilayers. Upon application of a time-varying thermal gradient, we observe a characteristic low-pass frequency response of the ensuing thermopower voltage with cutoff frequencies of up to 37 MHz. We interpret our results in terms of the spin Seebeck effect, and argue that small wavevector magnons are of minor importance for the spin Seebeck effect in our thin film hybrid structures.

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

[2]  C. Bhandari,et al.  Scattering of Magnons and Phonons in the Thermal Conductivity of Yttrium Iron Garnet , 1966 .

[3]  I. Kolokolov,et al.  The saga of YIG: Spectra, thermodynamics, interaction and relaxation of magnons in a complex magnet , 1993 .

[4]  Jairo Sinova,et al.  Spectral non-uniform temperature and non-local heat transfer in the spin Seebeck effect , 2013, Nature Communications.

[5]  Y. Tserkovnyak,et al.  Landau-Lifshitz theory of the longitudinal spin Seebeck effect , 2013, 1304.7295.

[6]  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.

[7]  A. Brataas,et al.  Spin pumping and magnetization dynamics in metallic multilayers , 2002, cond-mat/0208091.

[8]  D. Grundler,et al.  Space- and time-resolved Seebeck and Nernst voltages in laser-heated permalloy/gold microstructures , 2013 .

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

[10]  Stephan Altmannshofer,et al.  Investigation of induced Pt magnetic polarization in Pt/Y3Fe5O12 bilayers , 2012, 1211.0916.

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

[12]  J. Berakdar,et al.  Fokker-Planck approach to the theory of the magnon-driven spin Seebeck effect , 2013, 1311.3117.

[13]  Ken-ichi Uchida,et al.  Theory of the spin Seebeck effect , 2012, Reports on progress in physics. Physical Society.

[14]  C. Kittel,et al.  Relaxation Process in Ferromagnetism , 1953 .

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

[16]  Jun Hu,et al.  Intrinsic spin Seebeck effect in Au/YIG. , 2013, Physical review letters.

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

[18]  A. Serga,et al.  Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping , 2006, Nature.

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