Determination of the magnetic cubic anisotropy field in (111) oriented films by FMR

Zyuzin, A. M.; Radaĭkin, V. V.; Bazhanov, A. G.

doi:10.1134/1.1258618

Cited by 2 publications

(2 citation statements)

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“…7 yields 4πM 1.644 kG  , which is comparable to the bulk value 1.76 kG. [23] The corresponding conventional magnetic anisotropy constants (fields) are   is about an order of magnitude higher than the bulk value of  3.71 Oe [25]. Judged from the two constants K 1 and K 2 , we see that the easy axis for YIG film is in the (111) direction.…”

Section: Resultsmentioning

confidence: 80%

“…In this paper, we present a new method to obtain the anisotropy constants of a YIG film with better accuracy by using a broadband FMR spectrometer in which resonant fields are measured not only as a function of the field orientation, as specified by both the polar angle,  , but also over frequencies that range from 0.7 GHz to 8 GHz. Our method has three advantages over those of angle-resolved FMR at fixed frequency [22,23]: 1) the magnetization value can be directly extracted from the frequency-dependent FMR data without resorting to independent magnetometry measurements; 2) the azimuthal angle of the field orientation with respect to the crystal axis is determined as a part of the fitting process, thereby eliminating any error associated with aligning sample; 3) the resonant field change resulting from a shift in the anisotropy constant turns out to be strongly amplified at low frequencies (  2 GHz), by more than 10 times compared to that at 8 GHz. Furthermore, in this region we observe multiple resonances that can further enhance the accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Ferromagnetic resonance of a YIG film in the low frequency regime

Lee

Grudichak

Sklenar

et al. 2016

Journal of Applied Physics

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An improved method for characterizing the magnetic anisotropy of films with cubic symmetry is described and is applied to an yttrium iron garnet (111) film. Analysis of the FMR spectra performed both in-plane and out-of-plane from 0.7 to 8 GHz yielded the magnetic anisotropy constants as well as the saturation magnetization. The field at which FMR is observed turns out to be quite sensitive to anisotropy constants (by more than a factor ten) in the low frequency (< 2 GHz) regime and when the orientation of the magnetic field is nearly normal to the sample plane; the restoring force on the magnetization arising from the magnetocrystalline anisotropy fields is then comparable to that from the external field, thereby allowing the anisotropy constants to be determined with greater accuracy. In this region, unusual dynamical behaviors are observed such as multiple resonances and a switching of FMR resonance with only a 1 degree change in field orientation at 0.7 GHz.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%