講演情報
[14a-K303-2]Short-term memory property in non-substituted lattice mismatched iron garnet-based room temperature spin-glass
〇(PC)shamim sarker1, E M K Ikball Ahamed1, Haining Li1, Zhiqiang Liao1, Yang Dongxun1, Siyi Tang1, Hiroyasu Yamahara1, Munetoshi Seki1, Hitoshi Tabata1 (1.Tokyo Univ)
キーワード：
Spin glass、Short term memory、Reservoir computing、Magnetization Dynamics
A spin glass (SG) is defined by a frozen spin state at low temperatures, arising from the interplay of randomness and frustration in magnetic interactions. This state also exhibits an aging memory effect, creating a history-dependent property. This distinctive feature offers an opportunity to emulate the functions of the human brain, leveraging a similar Hamiltonian framework. Our objective is to investigate the spin dynamics of ultra-low power data carriers (magnons) in the spin glass system at a frozen state to develop a reservoir computing system that mimics the ultra-low power operation of the human brain. However, the spin frozen state in spin glasses (SG) only appears at extremely low temperatures, limiting their practical and low-power applications. Therefore, we aim to explore the potential for developing optimal room-temperature spin glass materials by manipulating the disorder within garnet-based ferrimagnetic materials. For further study of magnetization dynamics, we began with yttrium iron garnet (YIG:Y3Fe5O12) due to its exceptionally low Gilbert damping constant.