报导了磁流体薄片中聚焦激光束在探测50Hz交流磁场时产生与磁场相位无关响应的效应.聚焦于并通过磁流体薄片的633nm激光束的偏转角仅与交流磁场的幅度相关.为了探寻其机理,还研究了磁流体中聚焦激光束对开/关磁场或激光的瞬态响应.提出了基于磁熵守恒的磁流体中磁性粒子密度再分布正反馈模型来解释这一效应.这一模型也可以预见磁流体中一种磁-热失稳现象.
The effect of phase-independent response of a laser beam focused on a ferrofluid slab in sensing the 50 Hz magnetic field was reported.The refraction angles of a laser beam of 633nm wave-length focused on a slab of ferrofluid only respond to the magnitude of the magnetic field. Transient responses of the ferrofluid to switching magnetic field or light on/off were also measured to search the mechanism of the effect. A model of magnetic entropy conservation-based positive feedback in density redistributions of the magnetic particles in the ferrofluid is proposed for explaining this effect. This model also predicts a magneto-thermal instability in the ferrofluid.
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