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Determination of magnetic properties of ultrathin iron films using microwave stripline technique

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3 Author(s)
Su, Jun ; Department of Electrical and Computer Engineering and Institute for Surface and Interface Science, University of California, Irvine, California 92697 ; Tsai, C.S. ; Lee, C.C.

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Microwave microstrip line technique is utilized to determine the magnetic properties of ultrathin iron (Fe) films. Wideband tunable microwave filters are fabricated, either in integrated or flip-chip type, on ultrathin Fe films grown on GaAs substrates using molecular beam epitaxy. Taking advantage of the ferromagnetic resonance effects of the Fe films, four-fold variation of the resonance frequency is found to relate directly to the tetragonal symmetry of in-plane anisotropy. As a result, effective magnetization 4πMeff, four-fold in-plane anisotropy K1, second order term of perpendicular uniaxial anisotropy Ku⊥, and the Gilbert damping factor of the ultrathin films are derived from Landau–Lifshitz equation and transmission characteristics of the microwave filters involved. © 2000 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:87 ,  Issue: 9 )