Excitation Dynamics of Random Magnetic Systems

本项目研究由两类随机磁系统组成的随机磁系统的动力学：自旋玻璃和随机场伊辛磁体。这些系统在理论上还不完全被理解，人们希望这些实验将阐明它们动力学行为背后的基本物理。在自旋玻璃上的实验将解决具有高度简并的多重自由能极小值的系统的驰豫性质。以一种新的方式引入了温度循环，这样就可以对系统在相空间中的运动有新的见解。在相变温度以下的随机场伊辛磁体上进行实验，以实验验证预测的磁畴在时间上的对数增长。这些结果对于理解这些系统的动力学是很重要的。

This project is concerned with the dynamics of random magnetic systems consisting of two classes: spin-glasses and random-field Ising magnets. These systems are incompletely understood theoretically and it is hoped the experiments will shed light on the fundamental physics underlying their dynamical behavior. The experiments on spin-glasses wil address the relaxation properties of systems with highly degenerate multiple free energy minima. Temperature cycling is introduced in a new way so that new insights into the movement of the system through phase space can be followed. Experiments on random-field Ising magnets below the transition temperature to experimentally check the predicted the logarithmic growth in time of domains. These results are important in understanding the dynamics of these systems.