外周期驱动场作用下介观铁磁畴的共振运动

从铁磁畴的能量方程出发，利用正则量子化方法和么正变换技术，解析地求得了磁畴量子化运动的波函数。结果表明，即令磁畴的本征频率与外加周期驱动场频率不一致，磁畴的运动仍能表现出精确共振行为。另外，磁畴量子化运动的涨落只受阻尼力的影响，而完全与外加周期驱动场无关。

EXACT RESONANCE IN A MESOSCOPIC MOVING DOMAIN WALL APPLIED BY AN EXTERNAL TIME-DEPENDENT MAGNETIC FIELD

Starting from the classical motion equation of a domain wall in the ferro .magnetic system, the ana-lytic wavefunction was obtained by using canonical quantization method and unitary transformation. It isfound that the motion of the wavepacket center representing the domain wall motion can exhibit the exactresonance behavior when the natural oscillatory frequency does not exactly coincide with the externalmagnetic field frequency. In addition, the quantum fluctuations of displacement and momentum of thedomain wall are evaluated and are only influenced by the damped force but not by the external periodicalmagnetic field at all.