Imperial College London > Talks@ee.imperial > IEEE Magnetics Society Distinguished Lecturer Visits > Spin caloritronics – more than spin-dependent thermoelectrics
Log inImperial users Other users No account?Information onFinding a talk Adding a talk Syndicating talks Who we are Everything else |
Spin caloritronics – more than spin-dependent thermoelectricsAdd to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact Karl G Sandeman. The spin degree of freedom of the electron affects not only charge, but also heat and thermoelectric transport, leading to new effects in small structures that are studied in the field of spin caloritronics (from calor, the Latin word for heat). This lecture addresses the basic physics of spin caloritronics. Starting with an introduction into thermoelectrics and Onsager’s reciprocity relations, the generalization to include the spin dependence in the presence of metallic ferromagnets will be addressed. Using this foundation I will describe several recently discovered spin-dependent effects in metallic nanostructures and tunneling junctions in terms of a two spin-current model of non-interacting electrons. Next, I will argue that a different class of spin caloritronic effects exists that can be explained only by the collective spin dynamics in ferromagnets. The thermal spin transfer torque that allows excitation and switching of the magnetization in spin valves as well as the operation of nanoscale heat engines is complemented by thermal spin pumping. The latter generates the so-called spin Seebeck effect, which is generated by a heat current-induced non-equilibrium of magnons at a contact between an insulating or conducting ferromagnet and a normal metal. Under these conditions a net spin current is injected or extracted from the normal metal that can be detected by the inverse spin Hall effect. Both classes of effects can be understood in the adiabatic approximation for the magnetization dynamics and computed in terms of material-dependent electronic structures. Further issues to be addressed are the relation between electric, thermal and acoustic actuation of the magnetic order parameter, as well as the application potential of spin caloritronics. More details can be found in Ref. [1]. [1] G.E.W. Bauer, E. Saitoh, and B.J. van Wees, Spin Caloritronics, Nature Materials 11, 391 (2012). Download pdf with Full Details This talk is part of the IEEE Magnetics Society Distinguished Lecturer Visits series. This talk is included in these lists:
Note that ex-directory lists are not shown. |
Other listsCOMMSP & CP list Featured lists CAS TalksOther talksSpace for Everyone Sparse Signal Processing Diversity-Based Multi-Band Spectrum Sensing Policies for Cognitive and Co-exiting Radio Networks Games, Privacy and Distributed Algorithms for the Smart Grid Control of CPS using Passivity and Symmetry Algorithms and computer architectures for efficient real-time optimization and linear algebra solvers |