講演情報
[23p-12D-11]Two-fluid behavior of magnon transport in extended YIG films
〇Ryuhei Kohno1, Kyongmo An1, Eric Clot1, Vladimir Naletov1, Nicolas Thiery1, Laurent Vila1, Richard Schlitz2, Nathan Beaulieu3, Jamal Ben Youssef3, Abdelmadjid Anane4, Vincent Cros4, Hugo Merbouche4, Thomas Hauet5, Vlad Demidov6, Sergej Demokritov6, Gregoire de Leubens4, Olivier Klein1 (1.Univ. Grenoble Alpes, 2.ETH Zurich, 3.Univ. Bretagne Occidentale, 4.Univ. Paris Saclay, 5.Univ. Lorraine, 6.Univ. of Muenster)
キーワード：
magnonics、spin wave、YIG
Our talk presents a comprehensive study of the spatial dispersion of propagating magnons electrically emitted by the spin Hall effects across a YIG|Pt interface in extended yttrium-iron garnet (YIG) films. Our target is to provide a generic framework to describe the magnon transport. We experimentally elucidate the relevant spectral contributions of the electrically emitted magnons by studying the lateral decay of the magnon signal. The propagating magnons can be split into two fluids: (i) high-energy magnons carrying energy of about kBT, where kBT is the lattice temperature, with a characteristic decay length in the submicrometer range, and (ii) low-energy magnons, which carrying energy of about FMR frequency in GHz, with a characteristic decay length in the micrometer range. Taking advantage of their different physical properties, the low-energy magnons becomes the dominant fluid (i) at large current injection for the spin Hall effect, (ii) at large distance from the emitter.