Investigation of the unidirectional spin heat conveyer effect in a 200 nm thin Yttrium Iron Garnet film

• DOI: 10.1038/srep28233
• Publication Date: 2016-06-17T09:20:57Z
• Authors: Olga Wid; Jan Bauer; Alexander Müller; Otwin Breitenstein; Stuart S. P. Parkin; Georg Schmidt
• Keywords: Yttrium Iron Garnet; Magnon; Spin wave; Laser linewidth

Abstract We have investigated the unidirectional spin wave heat conveyer effect in sub-micron thick yttrium iron garnet (YIG) films using lock-in thermography (LIT). Although is small thin layers this technique allows us to observe asymmetric transport by magnons which leads temperature profiles differing several mK on both sides of exciting antenna, respectively. Comparison Damon-Eshbach and backward volume modes shows that flow indeed due non-reciprocal spin-waves. Because finite linewidth, asymmetries can still be observed when only uniform mode ferromagnetic resonance excited. The latter extreme importance for example measuring inverse spin-Hall because differences result thermovoltages at contacts. non-reciprocity these reverse their sign with a reversal magnetic field typically deemed signature voltage.