Analysis of Hysteretic Giant Magnetoimpedance Using Stoner-Wohlfarth Model

  • Jang, K.J. (Department of Physics and Advanced Materials Science, Sun Moon University, Research Center for Advanced Magnetic Materials, Chungnam National University) ;
  • Kim, C.G. (Department of Physics and Advanced Materials Science, Sun Moon University) ;
  • Kim, D.Y. (Telecom Systems SBU, Hyundai Electronics Co., Ltd.) ;
  • Kim, C.O. (Research Center for Advanced Magnetic Materials, Chungnam National University)
  • 발행 : 2000.09.01

초록

The hysteretic characteristics of giant magnetoimpedance (GMI) profiles have been measured in Co-based amorphous ribbon with various anisotropy angles $\theta_k$, and they have been analyzed by using the Stoner-Wohl-farth model. Two-peaks behavior with a dip near zero field is revealed in the measured GMI profile at 10 MHz irrespective of $\theta_k$. The negligible hysteresis of the field fur the dip is close to the calculation assuming the magnetization jump from a metastable to stable state. However, the hysteretic asymmetry far the angle range of $20^\circ\leq\theta_k < 60^\circ$ is well described by the divergence in the calculation without the magnetization jump. The asymmetry for $\theta_k\geq60^\circ$ may be due to the divergence, but the shapes of measured profiles are quite different from the calculations with single peak near zero field, indicating that Stoner-Wohlfarth model can be well used to describe GMI characteristics for the anisotropy angle range of $20^\circ\leq\theta_k < 60^\circ$at the frequency of 10 MHz in Co-based amorphous ribbons.

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참고문헌

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