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

Shien Uang Jen, Tzu Yang Chou, Chi-Kuen Lo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number468
Pages (from-to)1-5
Number of pages5
JournalNanoscale Research Letters
Volume6
DOIs
Publication statusPublished - 2011 Dec 1

Fingerprint

Ferromagnetic resonance
ferromagnetic resonance
impedance
Magnetic hysteresis
Hysteresis loops
hysteresis
Spin waves
Acoustic impedance
ultrahigh frequencies
Saturation magnetization
Magnetron sputtering
magnons
Film thickness
magnetron sputtering
Anisotropy
film thickness
Magnetic fields
saturation
Glass
magnetization

Keywords

  • Impedance
  • Magnetic films
  • Spin-wave resonance

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Impedance of nanometer thickness ferromagnetic Co 40Fe 40B 20 films. / Jen, Shien Uang; Chou, Tzu Yang; Lo, Chi-Kuen.

In: Nanoscale Research Letters, Vol. 6, 468, 01.12.2011, p. 1-5.

Research output: Contribution to journalArticle

@article{6900e636a64c4ed48ef9872428e6409c,
title = "Impedance of nanometer thickness ferromagnetic Co 40Fe 40B 20 films",
abstract = "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.",
keywords = "Impedance, Magnetic films, Spin-wave resonance",
author = "Jen, {Shien Uang} and Chou, {Tzu Yang} and Chi-Kuen Lo",
year = "2011",
month = "12",
day = "1",
doi = "10.1186/1556-276X-6-468",
language = "English",
volume = "6",
pages = "1--5",
journal = "Nanoscale Research Letters",
issn = "1931-7573",
publisher = "Springer New York",

}

TY - JOUR

T1 - Impedance of nanometer thickness ferromagnetic Co 40Fe 40B 20 films

AU - Jen, Shien Uang

AU - Chou, Tzu Yang

AU - Lo, Chi-Kuen

PY - 2011/12/1

Y1 - 2011/12/1

N2 - 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.

AB - 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.

KW - Impedance

KW - Magnetic films

KW - Spin-wave resonance

UR - http://www.scopus.com/inward/record.url?scp=84856070551&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84856070551&partnerID=8YFLogxK

U2 - 10.1186/1556-276X-6-468

DO - 10.1186/1556-276X-6-468

M3 - Article

VL - 6

SP - 1

EP - 5

JO - Nanoscale Research Letters

JF - Nanoscale Research Letters

SN - 1931-7573

M1 - 468

ER -