偏置铁磁--探测弱磁场的新方法
Biasing the ferronematic - a new way to detect weak magnetic field
摘要：
铁磁体的磁性，即，研究了低体积浓度磁性纳米粒子掺杂的液晶材料的交流磁化率。一个弱的直流偏置磁场（单位为Oe）施加到铁磁材料在其各向同性相大大增加了交流磁化率。各向同性到双折射相变的通过不可逆地重置了这种增强（除非在各向同性相中再次施加直流偏置场）。这些实验发现为应用可能性铺平了道路，例如低磁场传感器或信息存储的基本逻辑元件。
英文摘要：
Magnetic properties of a ferronematic, i.e., nematic liquid crystal doped with magnetic nanoparticles in low volume concentration are studied, with the focus on the ac magnetic susceptibility. A weak dc bias magnetic field (units of Oe) applied to the ferronematic in its isotropic phase increases the ac magnetic susceptibility considerably. Passage of the isotropic-to-nematic phase transition resets this enhancement irreversibly (unless the dc bias field is applied again in the isotropic phase). These experimental findings pave a way to application possibilities, such as low magnetic field sensors, or basic logical elements for information storage.
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