Revealing the Magnon Contribution to the Spin Seebeck Effect in TbIG:Polarised Neutron Inelastic Scattering Studies on Thales/IN12
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. The measurement of the acoustic mode were limited by the energy resolution on IN20. Here we propose to use higher energy cold neutron inelastic scattering on Thales or IN12, with polarisation analysis to obtain higher quality data on the acoustic magnons to better understand the differences between our theoretical calculations and magnon data and also to further refine our model on the origin of the SSE in the compensated rare-earth iron garnet systems. The SSE reflects the bulk magnon characteristics so that the unique energy resolution of neutron methods and bulk single crystals provide an idea tool for investigating the magnonic mechanisms involved in the technologically important SSE, applied to nanoscale magnetic insulator - metal (MI/M) composites.
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MANNIX Daniel; BOEHM Martin; DIETLEIN Maxim; ENDERLE Mechthild; Geprägs; SCHMALZL Karin and SCHMIDT Wolfgang F. (2019). Revealing the Magnon Contribution to the Spin Seebeck Effect in TbIG:Polarised Neutron Inelastic Scattering Studies on Thales/IN12. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1609
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