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Ferromagnetic resonance phenomenon of magnetic thin film under a perpendicular field

Gu Wen-Juan Pan Jing Hu Jing-Guo

Ferromagnetic resonance phenomenon of magnetic thin film under a perpendicular field

Gu Wen-Juan, Pan Jing, Hu Jing-Guo
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  • Received Date:  26 October 2011
  • Accepted Date:  13 February 2012
  • Published Online:  05 August 2012

Ferromagnetic resonance phenomenon of magnetic thin film under a perpendicular field

  • 1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 10974170) and the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11104239).

Abstract: Regarding ferromagnetic resonance frequency as a function of the perpendicular external magnetic field, the ferromagnetic resonance phenomenon is investigated. The results show that for the case where the external magnetic field is parallel to the its plane and the magnetic thin film has a perpendicular uniaxial magnetiocrystalline anisotropy, magnetic resonance frequency is divided into two categories, i.e., low frequency branch and high frequency branch, their specific relation depends on the magnetic anisotropy of the magnetic film; when external magnetic field is perpendicular to the systemic plane, the magnetic resonance frequency displays only a branch with the change of external magnetic field. In general, the magnetic resonance frequency decreases with the increase of the external magnetic field nonlinearly and monotonically. However, when the ratio between the cubic magnetocrystalline anisotropic field Hk1 and uniaxial magnetocrystalline anisotropic field Ha is about 2/3 Hk1/Ha < 1, the magnetic resonance frequency increases with the increase of external magnetic field, which is in good agreement with the experimental results. The results show that through magnetic resonance spectrum, the vertical magnetic anisotropy in magnetic thin film can be distinguished.

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