Abstract
In this paper, we first theoretically report the magnetic andmagneto-optical properties in paramagnetic media under high externalmagnetic field. Considering the action of the external magnetic field He and indirect exchange interaction Hv, the characteristic of themagnetic saturation and the property of the Faraday rotation to be nonlinearwith external magnetic field are presented in paramagnetic NdF3. Interms of our theory, the indirect exchange interaction plays an importantrole in the magnetization M and the Faraday rotation θ inNdF3 under high external magnetic field. The theory is in goodagreement with experimental results. On the other hand, a reasonableexplanation for the temperature dependence of the ratio of the Verdetconstant to the magnetic susceptibility V/χ is obtained.
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