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Thermally driven spin injection from a ferromagnet into a non-magnetic metal

Thermally driven spin injection from a ferromagnet into a non-magnetic metal. A. slachter , F. L. Bakker, J-P. Adam and B. J. van Wees Nature Physics 6, 879(2010) Physics of Nanodevices , Zernike Institute for Advanced Materials,

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Thermally driven spin injection from a ferromagnet into a non-magnetic metal

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  1. Thermally driven spin injection from a ferromagnet into a non-magnetic metal A. slachter, F. L. Bakker, J-P. Adam and B. J. van Wees Nature Physics 6, 879(2010) Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, 9747AG, Groningen, The Netherlands. Journal Club 2011

  2. Seebeck Effect • Temperature gradient -> Electric field(Voltage difference) • The Seebeck coefficient S is determined by: • the scattering rate • the density of the conduction electrons • In magnetic material, the Seebeck effect should be spin dependent Journal Club 2011

  3. Basic Idea This heat current causes a spin current into the Cu This voltage depends on the relative direction of M1 and M2 Journal Club 2011

  4. Theory Spin dependent current in bulk FM and NM Generalized spin diffusion equation When charge current is absent And in bulk FM Assume to the first order: Spin depended chemical potential and current are continuous at the interface Spin dependent currents are zero at outer interfaces Journal Club 2011

  5. Experiments Ohmic potential drops and Peltier effects of FM2-NM thermocouple Conventional spin-valve signal Joule heating of the FM2-NM thermocouple Thermal spin injection Journal Club 2011

  6. Results 1. K. Uchida et al. Nature 455 778(2008 Journal Club 2011

  7. More Results Maximum temperature gradient: corresponding to current density of: Compare to our sample Journal Club 2011

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