Revealing the Magnon Contribution to the Spin Seebeck Effect in the Prototype Compound Gd3Fe5O12 by Inelastic Neutron Scattering
The Spin Seebeck Effect (SSE) has attracted significant scent interest due to its potential in spintronics applications. In ferrimagnetic insulators, the SSE has been proposed to be a consequence of magnonic spin currents, the prototypical example being Gd3Fe5O12 (GdIG) We propose to measure the low energy magnon spectrum from GdIG using Inelastic neutron scattering (INS) and compare these results to our theory. This model suggest that an observed reversal in the SSE signal at low temperature is a consequence of low energy magnon band dynamics. We will use a proven method [7] to measure the INS from high neutron absorbing Gd, by using a large area (3x3cm) thin (1-micron) film of epitaxial GdIG on a Y3Al5O12 substrate (proof of feasibility!) We will use IN8 or IN20 to investigate the INS close to the gamma-point at (004) corresponding to a momentum transfer of 2.5 Inverse Angstroms and perform energy scans out to 16meV as a function of temperature. We expect to observe the low energy modes to merge as the temperature is raised from 20 to 100K. Confirmation of the magnon contribution to the SSE will provide a substantial step in understanding this technological class of materials.
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MANNIX Daniel; ENDERLE Mechthild; Geprägs; PIOVANO Andrea; Tobias WEBER; WILDES Andrew and ZIMAN Timothy. (2018). Revealing the Magnon Contribution to the Spin Seebeck Effect in the Prototype Compound Gd3Fe5O12 by Inelastic Neutron Scattering. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1560
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