Revealing the Origin of the Spin Seebeck Effect: Polarised Neutron Inelastic Scattering Studies of Dy3Fe5O12 on IN20
During our previous experiment on IN20 we obtained beautiful magnon data with full polarisation analysis on the Spin Seebeck Effect (SSE) material Tb3Fe5O12. The high energy (3-10meV) optical magnons agree quantitatively well with our theoretical model of the origin of the Spin Seebeck Effect. However, the lower energy acoustic modes (0-3meV) do not appear to agree with our theoretical model of the SSE. Here we propose to extend these measurements to Dy3Fe5O12 SSE material on IN20. In particular, the Dy3Fe5O12 compound shows an interesting magnetic field dependence of the SSE not observed in Tb3Fe5O12 (fig 1c). This field effect occurs at low temperatures (<120K) where the SSE becomes quenched. By investigating the magnon behavior in magnetic fields of 0-4T available in the horizontal magnet on IN20 will provide more information on the magnon mechanism involved at low temperatures. These results will enable us to further refine our model on the origin of the SSE in the compensated rare-earth iron garnet systems. The SSE The unique energy resolution of neutron methods and bulk single crystals provide an idea tool for investigating origin of the technologically important SSE.
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MANNIX Daniel; DIETLEIN Maxim; ENDERLE Mechthild; Geprägs; THIES Thomas and Tobias WEBER. (2019). Revealing the Origin of the Spin Seebeck Effect: Polarised Neutron Inelastic Scattering Studies of Dy3Fe5O12 on IN20. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1610
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