講演情報
[7a-N302-8]Investigating the atomic origin of room temperature spin glass behavior in non-substituted yttrium iron garnet thin films towards brain mimetic computing
〇(PC)shamim sarker1, E M K Ikball Ahamed1, Zhiqiang Liao1, Ritsui Sonetaka1, Ryoken Nako1, Yang Dongxun1, Haining Li1, Hiroyasu Yamahara1, Munetoshi Seki1, Hitoshi Tabata1 (1.Tokyo Univ)
キーワード：
Spin glass、Short term memory、Reservoir computing、Magnetization Dynamics
Systems with disordered magnetic configurations can enter a frozen spin state at low temperatures, driven by the coexistence of frustration and randomness in their exchange interactions. Such states inherently exhibit non-equilibrium behaviors like memory retention and history dependence, making them attractive for brain-inspired computational models. This work investigates the dynamics of low-power spin excitations within such disordered regimes to enable neuromorphic reservoir computing. However, the need for cryogenic temperatures restricts their applicability. To address this, we explore the emergence of glassy spin states near ambient conditions by tailoring oxygen non-stoichiometry in garnet-based ferrimagnets. Yttrium iron garnet (Y3Fe5O12) serves as our initial platform due to its minimal intrinsic damping and robust magnetic order.