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Chin. Phys. B, 2008, Vol. 17(8): 3093-3096    DOI: 10.1088/1674-1056/17/8/054
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effects of exchange interaction and spin-fluctuation on the magnetic and magneto-optic properties of NdF3

Zhang Guo-Ying(张国营)a), Xia Tian(夏天)b), Zhang Xue-Long(张学龙)b), and Xue Liu-Ping(薛刘萍)a)
a Department of Physics, College of Science, China University of Mining and Technology, Xuzhou 221008, China; b College of Medical Mechanism, Shanghai University of Science and Technology, Shanghai 200093, China
Abstract  The exchange interaction between the electrons in the different magnetic ions and the spin-fluctuation of the magnetic ions exist in the paramagnetic media NdF$_{3}$. The exchange interaction between the electrons in the different magnetic ions may be equivalent to an effective field $H_{in}$ that is in direct proportion to the magnetization M. The spin-fluctuation of the magnetic ions leads the coefficient of the effective field to vary with temperature. The effective field is given as H$_{\rm in} = - (0.75 + 0.22{\rm T})$ $\times 10^{^{ - 5}}$M in NdF$_{3}$. When the secondary crystal field effect is taken into account, the magnetic susceptibility and Verdet constant are calculated for NdF$_{3}$ by means of the effective field H$_{\rm in} $ and the applied field H$_e$. The calculated results are in agreement with the measured ones.
Keywords:  exchange interaction      spin-fluctuation      magnetic and MO properties      NdF$_{3}$ crystal  
Received:  04 February 2008      Revised:  18 March 2008      Accepted manuscript online: 
PACS:  75.30.Et (Exchange and superexchange interactions)  
  75.30.Cr (Saturation moments and magnetic susceptibilities)  
  75.30.Ds (Spin waves)  
  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  78.20.Ls (Magneto-optical effects)  
Fund: Project supported by the Science and Technology Foundation of China University of Mining and Technology (Grant No OK061066).

Cite this article: 

Zhang Guo-Ying(张国营), Xia Tian(夏天), Zhang Xue-Long(张学龙), and Xue Liu-Ping(薛刘萍) Effects of exchange interaction and spin-fluctuation on the magnetic and magneto-optic properties of NdF3 2008 Chin. Phys. B 17 3093

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