講演情報
[22a-P01-33]Amplified transport of low-energy magnons in Bi-doped YIG by local heating
〇Ryuhei Kohno1, Kyongmo An2,1, Vladimir Naletov1, Jamal Ben Youssef3, Diane Gouere4, Vincent Cros4, Abdelmadjid Anane4, Gregoire de Leubens4, Laurent Vila1, Olivier Klein1 (1.Univ. Grenoble Alpes, 2.KRISS, 3.Univ. Bretagne Occidentale, 4.Univ. Paris Saclay)
キーワード：
magnonics、spin wave、YIG
Magnonics aims at proposing novel circuits operated by spin waves, or their quanta magnons, especially on insulators with reduced energy losses. Using a prototypical device which consists of two Pt electrodes, such magnons can be incoherently generated through spin orbit torques at the emitter, and can be sensed electrically through the inverse spin Hall effect at the collector. We use a Bi-doped YIG thin film with perpendicular uniaxial anisotropy and fabricated a transport device with an additional electrode to control the transport. We fabricated a modulator electrode deposited on top of the collector in thermal contact but electrically isolated by an intercalation layer of Si3N4 of 20 nm thickness. We observed reversible amplification of the conduction of low-energy magnons by a factor of 3 by heating locally the region beneath the collector. Micromagnetic simulations suggest that the local gradient magnetization acts as a magnon mirror that increases the oscillation amplitude.