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Impedance of nanometer thickness ferromagnetic Co40Fe40B20 films.

Jen SU, Chou TY, Lo CK - Nanoscale Res Lett (2011)

Bottom Line: In the h//w case, IM spectra show QFMR-K at F0 and FMR-W at Fn.We find that f0 and F0 are shifted from fFMRK, respectively, and fn = Fn.The in-plane spin-wave resonances are responsible for those relative shifts.PACS No. 76.50.+q; 84.37.+q; 75.70.-i.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Physics, Academia Sinica, Taipei, Taiwan, 11529, Republic of China. physjen@gate.sinica.edu.tw.

ABSTRACT
Nanocrystalline Co40Fe40B20 films, with film thickness tf = 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 4πMs = 15.5 kG, anisotropy field Hk = 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 f0 and the Walker-mode ferromagnetic resonance (FMR-W) at fn, where n = 1, 2, 3, and 4. In the h//w case, IM spectra show QFMR-K at F0 and FMR-W at Fn. We find that f0 and F0 are shifted from fFMRK, respectively, and fn = Fn. The in-plane spin-wave resonances are responsible for those relative shifts.PACS No. 76.50.+q; 84.37.+q; 75.70.-i.

No MeSH data available.


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Ferromagnetic resonance of the Co40Fe40B20 film with the microwave frequency f = 9.6 GHz. HR is the resonance field.
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Figure 2: Ferromagnetic resonance of the Co40Fe40B20 film with the microwave frequency f = 9.6 GHz. HR is the resonance field.

Mentions: A circular film sample was taken for the FMR experiment. The cavity used was a Bruker ER41025ST X-band resonator (Bruker Optics Taiwan Ltd., San Chung, Taiwan, Republic of China) which was tuned at f = 9.6 GHz, and the film sample was oriented such that //and ⊥ , where was an in-plane field which varied from 0 to 5 kG, and was the microwave field. The result is shown in Figure 2, where we can spot an FMR (or FMR-K) event at H = HR = 0.68 kG, and define the half-peak width ΔH = 53 Oe.


Impedance of nanometer thickness ferromagnetic Co40Fe40B20 films.

Jen SU, Chou TY, Lo CK - Nanoscale Res Lett (2011)

Ferromagnetic resonance of the Co40Fe40B20 film with the microwave frequency f = 9.6 GHz. HR is the resonance field.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211980&req=5

Figure 2: Ferromagnetic resonance of the Co40Fe40B20 film with the microwave frequency f = 9.6 GHz. HR is the resonance field.
Mentions: A circular film sample was taken for the FMR experiment. The cavity used was a Bruker ER41025ST X-band resonator (Bruker Optics Taiwan Ltd., San Chung, Taiwan, Republic of China) which was tuned at f = 9.6 GHz, and the film sample was oriented such that //and ⊥ , where was an in-plane field which varied from 0 to 5 kG, and was the microwave field. The result is shown in Figure 2, where we can spot an FMR (or FMR-K) event at H = HR = 0.68 kG, and define the half-peak width ΔH = 53 Oe.

Bottom Line: In the h//w case, IM spectra show QFMR-K at F0 and FMR-W at Fn.We find that f0 and F0 are shifted from fFMRK, respectively, and fn = Fn.The in-plane spin-wave resonances are responsible for those relative shifts.PACS No. 76.50.+q; 84.37.+q; 75.70.-i.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Physics, Academia Sinica, Taipei, Taiwan, 11529, Republic of China. physjen@gate.sinica.edu.tw.

ABSTRACT
Nanocrystalline Co40Fe40B20 films, with film thickness tf = 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 4πMs = 15.5 kG, anisotropy field Hk = 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 f0 and the Walker-mode ferromagnetic resonance (FMR-W) at fn, where n = 1, 2, 3, and 4. In the h//w case, IM spectra show QFMR-K at F0 and FMR-W at Fn. We find that f0 and F0 are shifted from fFMRK, respectively, and fn = Fn. The in-plane spin-wave resonances are responsible for those relative shifts.PACS No. 76.50.+q; 84.37.+q; 75.70.-i.

No MeSH data available.


Related in: MedlinePlus