第85回「非線形・統計力学とその周辺」セミナーのご案内
日時:平成19年6月15日(金)15時から
場所:京都大学工学部総合校舎102講義室(吉田キャンパス)
講演者:Per Arne Rikvold (Department of Physics, Florida State University)
講演題目:
Dynamic Phase Transition in Kinetic Ising Models Driven by an Osillating Field:
New Experiments and Results on the Conjugate Field and
a Nonequilibrium Fluctuation-Dissipation Relation
講演要旨:
Kinetic Ising models driven by a temporally oscillating applied field undergo a nonequilibrium phase transition in the Ising universality class at a critical value of the ratio of the period of the applied field to the intrinsic time scale for magnetization switching in the Ising system. Following a short introduction to the phenomenon I discuss a recent experimental observation in [Co/Pt]_3 multilayers, as well as kinetic Monte Carlo simulations that establish the field conjugate to the dynamic order parameter and demonstrate the existence of a nonequilibrium fluctuation-Dissipation relation in the critical region.