Determining wave vector and material property from the phase-shift of spin-wave propagationMingqiang Bao1, Kin Wong1, Alexander Khitun1, Jooyoung Lee1, Zhibiao Hao1, Kang L. Wang1, Dok Won Lee2 and Shan X. Wang2
1 Department of Electrical Engineering, University of California at Los Angeles - Los Angeles, CA 90095, USA
2 Geballe Laboratory for Advanced Materials, Department of Materials Science and Engineering, Stanford University - Stanford, CA 94305-4045, USA
received 2 June 2008; accepted in final form 9 September 2008; published October 2008
published online 13 October 2008
Different to conventional ferromagnetic resonance methods, we use the phase-shift of spin-wave propagation to investigate spin-wave in conducting ferromagnetic thin films. Spin-wave wave vector (or wave number) k, a key parameter in the study of spin-wave dispersion and propagation, is extracted from the ratio of the phase-shift to the propagation distance and the ratio of the intercepts to the slopes of the plot of frequency square (f2) vs. the bias field (H). The wave vectors calculated by both methods are in good agreement. The in-plane anisotropy field Hk and saturation magnetization MS can also be extracted from the phase-shift map.
75.30.Ds - Spin waves.
85.70.Ay - Magnetic device characterization, design, and modeling.
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