一种测量微量有机材料磁化率各向异性的光学方法

Optical method measuring magnetic anisotropy of a title organic material

提出了一种测量有机材料的磁化率各向异性的方法。原理是利用掺杂对丝状液晶磁场扭曲费雷德里克兹转变影响的现象,将待测有机材料作为掺杂物,采用光学相位延迟法测量掺杂丝状液晶磁场扭曲费雷德里克兹转变阈值和过程,从而获得待测有机材料的磁化率各向异性。通过实验测量,从原理和方法上验证了测量方法的可行性。测得有机材料磁化率各向异性的同时也为有机材料的表征提供了一种方法。测量方法适用于无固有磁矩的有机材料。

An optical method measuring magnetic anisotropy of organic material is put forward. The principle of the method measuring magnetic anisotropy of organic material is the phenomenon that the adulteration influences magnetic field twist Freedericksz transition of planar nematic liquid crystal, in which organic material to be measured is regarded as adulterant. The threshold of magnetic field twist Freedericksz transition of the adulteration planar nematic liquid crystal is measured with the optical phase retardation method, so that magnetic anisotropy of organic material is obtained. With the experiments, the feasibility of the principle and the way measuring magnetic anisotropy of organic material is proved. With the method, magnetic anisotropy of organic material can be gotten as well as a means of organic material token is found. The method applies to organic material without inherent magnetic square.