中国物理B ›› 2008, Vol. 17 ›› Issue (8): 3093-3096.doi: 10.1088/1674-1056/17/8/054

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

夏 天1, 张学龙1, 张国营2, 薛刘萍2   

  1. (1)College of Medical Mechanism, Shanghai University of Science and Technology, Shanghai 200093, China; (2)Department of Physics, College of Science, China University of Mining and Technology, Xuzhou 221008, China
  • 收稿日期:2008-02-04 修回日期:2008-03-18 出版日期:2008-08-20 发布日期:2008-08-20
  • 基金资助:
    Project supported by the Science and Technology Foundation of China University of Mining and Technology (Grant No OK061066).

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)   

  1. 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
  • Received:2008-02-04 Revised:2008-03-18 Online:2008-08-20 Published:2008-08-20
  • Supported by:
    Project supported by the Science and Technology Foundation of China University of Mining and Technology (Grant No OK061066).

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摘要： 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 $\bm M$. The spin-fluctuation of the magnetic ions leads the coefficient of the effective field to vary with temperature. The effective field is given as $\bm H_{\rm in} = - (0.75 + 0.22{\rm T})\times 10^{^{ - 5}}\bm M$ 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 $\bm H_{\rm in} $ and the applied field $\bm H_e$. The calculated results are in agreement with the measured ones.

关键词: exchange interaction, spin-fluctuation, magnetic and MO properties, NdF$_{3}$ crystal

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.

Key words: exchange interaction, spin-fluctuation, magnetic and MO properties, NdF$_{3}$ crystal

中图分类号:  (Exchange and superexchange interactions)

  • 75.30.Et
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)