中国物理B ›› 1993, Vol. 2 ›› Issue (3): 198-205.doi: 10.1088/1004-423X/2/3/005

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A STUDY ON THE ULTRASONIC VELOCITY AND ATTENU-ATION IN NdFeB MAGNET WITHIN THE TEMPERATURE RANGE OF 80 - 300K (Ⅱ)

罗阳, 侯玉敏   

  1. Beijing Quenchmag Incoporation, Beijing 100084,China
  • 收稿日期:1991-12-09 出版日期:1993-03-20 发布日期:1993-03-20
  • 基金资助:
    Project supported in part by the State Key Laboratory of Magnetism, Institute of Physics, Academia Sinica.

A STUDY ON THE ULTRASONIC VELOCITY AND ATTENU-ATION IN NdFeB MAGNET WITHIN THE TEMPERATURE RANGE OF 80 - 300K (Ⅱ)

LUO YANG (罗阳), HOU YU-MIN (侯玉敏)   

  1. Beijing Quenchmag Incoporation, Beijing 100084,China
  • Received:1991-12-09 Online:1993-03-20 Published:1993-03-20
  • Supported by:
    Project supported in part by the State Key Laboratory of Magnetism, Institute of Physics, Academia Sinica.

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摘要： Based on the ultrasonic measurements of an isotropic NdFeB magnet in the temperature range of 77 - 300 K, it was found that the elastic parameters, such as Young's modulus E, and Poisson ratio v, change abruptly near the spin reorientation temperature Tsr. This indicates that soft mode emerges in the process of spin reorientation. Thermal hysteresis was observed during heating-up and cooling-down processes. Both Debye temperature and heat capacity were calculated, which suggests that the magnetic entropy of the Nd-sublattice is larger in easy-cone state than in easy-axis state.

Abstract: Based on the ultrasonic measurements of an isotropic NdFeB magnet in the temperature range of 77 - 300 K, it was found that the elastic parameters, such as Young's modulus E, and Poisson ratio v, change abruptly near the spin reorientation temperature Tsr. This indicates that soft mode emerges in the process of spin reorientation. Thermal hysteresis was observed during heating-up and cooling-down processes. Both Debye temperature and heat capacity were calculated, which suggests that the magnetic entropy of the Nd-sublattice is larger in easy-cone state than in easy-axis state.

中图分类号: 

  • 4335