Impedance of nanometer thickness ferromagnetic Co 40Fe 40B 20 films

Shien Uang Jen, Tzu Yang Chou, Chi Kuen Lo

研究成果: 雜誌貢獻文章

3 引文 斯高帕斯(Scopus)

摘要

Nanocrystalline Co 40Fe 40B 20 films, with film thickness t f = 100 nm, were deposited on glass substrates by the magnetron sputtering method at room temperature. During the film deposition period, a dc magnetic field, h = 40 Oe, was applied to introduce an easy axis for each film sample: one with h-L and the other with h-w, where L and w are the length and width of the film. Ferromagnetic resonance (FMR), ultrahigh frequency impedance (IM), dc electrical resistivity (ρ), and magnetic hysteresis loops (MHL) of these films were studied. From the MHL and r measurements, we obtain saturation magnetization 4πM s = 15.5 kG, anisotropy field H k = 0.031 kG, and r = 168 mW.cm. From FMR, we can determine the Kittel mode ferromagnetic resonance (FMR-K) frequency fFMRK = 1,963 MHz. In the h-L case, IM spectra show the quasi-Kittel-mode ferromagnetic resonance (QFMR-K) at f 0 and the Walker-mode ferromagnetic resonance (FMR-W) at f n, where n = 1, 2, 3, and 4. In the h-w case, IM spectra show QFMR-K at F 0 and FMR-W at F n. We find that f 0 and F 0 are shifted from f FMRK, respectively, and f n = F n. The in-plane spin-wave resonances are responsible for those relative shifts.

原文英語
文章編號468
頁(從 - 到)1-5
頁數5
期刊Nanoscale Research Letters
6
DOIs
出版狀態已發佈 - 2011 十二月 1

    指紋

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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