### Abstract

Two series of Fe_{81-x}Ni_{x}Ga _{19}/Si(1 0 0) and Fe_{81-y}Ni_{y}Ga _{19}/glass films, where x or y = 0-26, were made by the magnetron sputtering method. The film thickness (t_{f}) was fixed at 100 nm. We have performed three kinds of experiments on these films: (i) the saturation magnetostriction (λ_{S}) measurement; (ii) the easy-axis and hard-axis magnetic hysteresis loop measurements; and (iii) the ferromagnetic resonance (FMR) experiment to find the resonance field (H_{R}) with an X-band cavity tuned at f_{R} = 9.6 GHz. The natural resonance frequency, f_{FMR}, of the Kittel mode at zero external field (H = 0) is defined as f_{FMR} ≒ ν[H_{K}4πM_{S}]^{1/2}, where γ = 2πν is the gyromagnetic ratio, H_{K} and 4πM_{S} are the uniaxial anisotropy field and saturation magnetization, and H_{K} << 4πM_{S}. The Gilbert damping constant, α, is calculated from the formula, α = [ν(ΔH)_{S}]/(2f_{R}), where (ΔH)_{exp} = (ΔH)_{S} + (ΔH)_{A}, (ΔH)_{exp} is the half-width of the absorption peak around the resonance field H_{R}, (ΔH)_{S} is the symmetric part of (ΔH)_{exp}, and (ΔH)_{A} is the asymmetric part. The degree of asymmetry, (ΔH)_{A}/(ΔH)_{exp}, is associated with the structural and/or magnetic inhomogeneities in the film. The main findings of this study are as follows: (A) f_{FMR} tends to decrease, as x or y increases; (B) α decreases from 0.052 to 0.020 and then increases from 0.020 to 0.050, as x increases, and α decreases from 0.060 to 0.013 in general, as y increases; and (C) λ_{S} reaches a local maximum when x = 22. We conclude that the Fe_{59}Ni_{22}Ga _{19}/glass film should be the most suitable for application in magneto-electric microwave devices.

Original language | English |
---|---|

Pages (from-to) | 111-115 |

Number of pages | 5 |

Journal | Journal of Alloys and Compounds |

Volume | 562 |

DOIs | |

Publication status | Published - 2013 Jun 15 |

### Fingerprint

### Keywords

- FeNiGa films
- Ferromagnetic resonance
- Magnetostriction

### ASJC Scopus subject areas

- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry

### Cite this

_{81-x}Ni

_{x}Ga

_{19}/Si(1 0 0) and Fe

_{81-y}Ni

_{y}Ga

_{19}/glass films.

*Journal of Alloys and Compounds*,

*562*, 111-115. https://doi.org/10.1016/j.jallcom.2013.01.169

**Ferromagnetic resonance properties of Fe _{81-x}Ni _{x}Ga_{19}/Si(1 0 0) and Fe_{81-y}Ni _{y}Ga_{19}/glass films.** / Liu, Chi Ching; Jen, Shien Uang; Juang, Jenh Yih; Lo, Chi-Kuen.

Research output: Contribution to journal › Article

_{81-x}Ni

_{x}Ga

_{19}/Si(1 0 0) and Fe

_{81-y}Ni

_{y}Ga

_{19}/glass films',

*Journal of Alloys and Compounds*, vol. 562, pp. 111-115. https://doi.org/10.1016/j.jallcom.2013.01.169

_{81-x}Ni

_{x}Ga

_{19}/Si(1 0 0) and Fe

_{81-y}Ni

_{y}Ga

_{19}/glass films. Journal of Alloys and Compounds. 2013 Jun 15;562:111-115. https://doi.org/10.1016/j.jallcom.2013.01.169

}

TY - JOUR

T1 - Ferromagnetic resonance properties of Fe81-xNi xGa19/Si(1 0 0) and Fe81-yNi yGa19/glass films

AU - Liu, Chi Ching

AU - Jen, Shien Uang

AU - Juang, Jenh Yih

AU - Lo, Chi-Kuen

PY - 2013/6/15

Y1 - 2013/6/15

N2 - Two series of Fe81-xNixGa 19/Si(1 0 0) and Fe81-yNiyGa 19/glass films, where x or y = 0-26, were made by the magnetron sputtering method. The film thickness (tf) was fixed at 100 nm. We have performed three kinds of experiments on these films: (i) the saturation magnetostriction (λS) measurement; (ii) the easy-axis and hard-axis magnetic hysteresis loop measurements; and (iii) the ferromagnetic resonance (FMR) experiment to find the resonance field (HR) with an X-band cavity tuned at fR = 9.6 GHz. The natural resonance frequency, fFMR, of the Kittel mode at zero external field (H = 0) is defined as fFMR ≒ ν[HK4πMS]1/2, where γ = 2πν is the gyromagnetic ratio, HK and 4πMS are the uniaxial anisotropy field and saturation magnetization, and HK << 4πMS. The Gilbert damping constant, α, is calculated from the formula, α = [ν(ΔH)S]/(2fR), where (ΔH)exp = (ΔH)S + (ΔH)A, (ΔH)exp is the half-width of the absorption peak around the resonance field HR, (ΔH)S is the symmetric part of (ΔH)exp, and (ΔH)A is the asymmetric part. The degree of asymmetry, (ΔH)A/(ΔH)exp, is associated with the structural and/or magnetic inhomogeneities in the film. The main findings of this study are as follows: (A) fFMR tends to decrease, as x or y increases; (B) α decreases from 0.052 to 0.020 and then increases from 0.020 to 0.050, as x increases, and α decreases from 0.060 to 0.013 in general, as y increases; and (C) λS reaches a local maximum when x = 22. We conclude that the Fe59Ni22Ga 19/glass film should be the most suitable for application in magneto-electric microwave devices.

AB - Two series of Fe81-xNixGa 19/Si(1 0 0) and Fe81-yNiyGa 19/glass films, where x or y = 0-26, were made by the magnetron sputtering method. The film thickness (tf) was fixed at 100 nm. We have performed three kinds of experiments on these films: (i) the saturation magnetostriction (λS) measurement; (ii) the easy-axis and hard-axis magnetic hysteresis loop measurements; and (iii) the ferromagnetic resonance (FMR) experiment to find the resonance field (HR) with an X-band cavity tuned at fR = 9.6 GHz. The natural resonance frequency, fFMR, of the Kittel mode at zero external field (H = 0) is defined as fFMR ≒ ν[HK4πMS]1/2, where γ = 2πν is the gyromagnetic ratio, HK and 4πMS are the uniaxial anisotropy field and saturation magnetization, and HK << 4πMS. The Gilbert damping constant, α, is calculated from the formula, α = [ν(ΔH)S]/(2fR), where (ΔH)exp = (ΔH)S + (ΔH)A, (ΔH)exp is the half-width of the absorption peak around the resonance field HR, (ΔH)S is the symmetric part of (ΔH)exp, and (ΔH)A is the asymmetric part. The degree of asymmetry, (ΔH)A/(ΔH)exp, is associated with the structural and/or magnetic inhomogeneities in the film. The main findings of this study are as follows: (A) fFMR tends to decrease, as x or y increases; (B) α decreases from 0.052 to 0.020 and then increases from 0.020 to 0.050, as x increases, and α decreases from 0.060 to 0.013 in general, as y increases; and (C) λS reaches a local maximum when x = 22. We conclude that the Fe59Ni22Ga 19/glass film should be the most suitable for application in magneto-electric microwave devices.

KW - FeNiGa films

KW - Ferromagnetic resonance

KW - Magnetostriction

UR - http://www.scopus.com/inward/record.url?scp=84874940954&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874940954&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2013.01.169

DO - 10.1016/j.jallcom.2013.01.169

M3 - Article

VL - 562

SP - 111

EP - 115

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -