講演情報
[7a-N302-7]Electric field control of spin wave propagation in strained iron oxide garnet thin films with unquenched orbital moments
〇(D)EMK IKBALL AHAMED1, Md Shamim Sarker1, Hiroyasu Yamahara1, Munetoshi Seki1, Hitoshi Tabata1 (1.University of Tokyo)
キーワード：
centrosymmetry breaking、spin wave modulation、magnetization dynamics
This study explores electric-field control of spin wave propagation in rare-earth iron garnet (RIG) thin films by reducing their inherent cubic symmetry through epitaxial strain. Using PLD, YIG and LuIG films were grown on lattice-matched (GGG) and mismatched (SGGG) substrates. XAS and XMCD analyses showed unquenched orbital moments in strained films, indicating symmetry breaking from cubic to tetragonal. Strain lifts orbital degeneracy in Fe–O octahedra, allowing partial recovery of orbital angular momentum. A voltage-controlled spin wave device using interdigital electrodes (IDE) demonstrated electric-field-induced resonance shifts in strained films, driven by changes in magnetization due to orbital polarization. This dynamic control enables low-power spin wave logic, advancing magnonic technologies.