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

N1 - Funding Information:
This work is supported by a Grant No. NSC 100-2112-M-001-017-MY3 , from the National Science Council .
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

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

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U2 - 10.1016/j.jallcom.2013.01.169

DO - 10.1016/j.jallcom.2013.01.169

M3 - Article

AN - SCOPUS:84874940954

VL - 562

SP - 111

EP - 115

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -