講演情報
[23a-12D-9]Electric field controlled dynamic modulation of spin wave in rare earth iron functional oxide thin films
〇(D)EMK IKBALL AHAMED1, Md Shamim Sarker1, Hiroyasu Yamahara1, Munetoshi Seki1, Hitoshi Tabata1 (1.University of Tokyo)
キーワード：
spin wave、spin-orbit coupling、magnetic anisotropy
Both spin and dipole coexistence are expected in Rare-earth Iron Garnet (RIG) thin films by breaking the spatial inversion symmetry in tilted strained structure (generated from strain gradient) at the nanoscale. Symmetry broken structure can be achieved by controlling the epitaxial strain in thin films. This study aims to facilitate electric field-controlled spin wave (SW) propagation in symmetry-broken RIG thin films. Using comb-shaped interdigital metal electrodes, we applied an in-plane electric field and investigated the electric field-controlled spin-wave propagation. Initially, we fabricated thickness variant Lu3Fe5O12 (LuIG) thin films on partial lattice mismatched single crystal Ga3Gd5O12 (GGG) and Gd2.6Ca0.4Ga4.1Mg0.25Zr0.65O12 (SGGG) substrates by pulsed laser deposition (PLD) technique. After that, a pair of Au co-planner waveguides (CPWs) and Pt interdigital electrodes (IDE) were fabricated by photolithography and sputtering techniques on 100-120nm partial lattice mismatched (∼-0.88%) LuIG/GGG heterostructures. SW transmission characteristics were measured by microwave technique using vector network analyzer (VNA). The spin-wave transmission spectra indicated a significant right shift with the application of an electric field and a complete turnback observed after removing the field. This phenomenon may be attributed to the spin–orbit coupling as well as the modulation of local magnetic anisotropy of LuIG/Pt bilayer due to the application of an electric field in IDE.