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Uniaxial anisotropy of two-magnon scattering in an ultrathin epitaxial Fe layer on GaAs
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Image of FIG. 1.
FIG. 1.

(a) SEM image of the Fe microbar with the schematic of measurement circuit used for this study and the definition of orientations used in this paper. (b) Typical FMR traces on detected dc voltages across the Fe bar for different frequencies ( ). Measured voltages are represented by dots and the fit curves are produced by Eq. (1) .

Image of FIG. 2.
FIG. 2.

Resonance field as a function of (a) in-plane magnetic field direction measured at 18 GHz and (b) frequency f with fitting curves using Eq. (2) . The dots and lines are measured values and fit curves, respectively.

Image of FIG. 3.
FIG. 3.

(a) Schematic of a two-magnon process in spin-wave dispersion curves. The initial magnon with a state of f 0 and k = 0 scatters into a different momentum state. (b) FMR linewidth as a function of in-plane magnetic field direction represented by dots, along with a curve produced by the model. The excitation field is at 18 GHz. (c) Equilibrium magnetic moment direction ϕ for measured (represented as dots) and a fit curve. (d) 1/Φ and (e) calculated from ϕ and other FMR fit parameters.

Image of FIG. 4.
FIG. 4.

(a) The resonance field , (b) , and inset(b) the equilibrium angle θ as a function of out-of-plane angle . The dots are the experimental data measured at 12 GHz. θ is calculated from the experimental data and magnetic anisotropies. All the curves shown are the results of numerical fits. (c) Frequency dependence of for easy and hard axes represented by dots. The curves are produced by the model and best fit parameters. (d) Two-magnon linewidth component (dots) extracted by differentiating measured by the linewidth from the other components in the model. The curve is calculated by the last term in Eq. (4) .


Generic image for table
Table I.

Magnetic anisotropy and relaxation parameters of the Fe microbars


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Uniaxial anisotropy of two-magnon scattering in an ultrathin epitaxial Fe layer on GaAs