Static and Dynamic Magnetic Properties of Sputtered Fe–Ga Thin Films

Gopman, Daniel B.; Sampath, Vimal; Ahmad, Hasnain; Bandyopadhyay, Supriyo; Atulasimha, Jayasimha

doi:10.1109/tmag.2017.2700404

Cited by 35 publications

(17 citation statements)

References 32 publications

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“…For the PP case we obtain g = 2.0564 ± 0.0007 and 4πM e f f = 13.821 ± 0.004 kOe, and for the IP case g = 2.14 ± 0.01 and 4πM e f f = 11.7 ± 0.2 kOe. The PP value of 4πM e f f = 13.821 kOe is higher than previous bulk measurements 7 but is similar to values obtained in thin films 8 . The inset shows a close-up of the IP data at low frequencies, from whence it is clear that a discrepancy exists between the IP data and the fit to Eq.…”

supporting

confidence: 86%

Two-magnon frequency-pulling effect in ferromagnetic resonance

Peria,

Yu,

Lee

et al. 2020

Preprint

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We report the experimental observation in thin films of the hybridization of the uniform ferromagnetic resonance mode with nonuniform magnons as a result of the two-magnon scattering mechanism, leading to a frequency-pulling effect on the ferromagnetic resonance. This effect, when not properly accounted for, leads to a discrepancy in the dependence of the ferromagnetic resonance field on frequency for different field orientations. The frequency-pulling effect is the complement of the broadening of the ferromagnetic resonance lineshape by two-magnon scattering and can be calculated using the same parameters. By accounting for the two-magnon frequency shifts through these means, consistency is achieved in fitting data from in-plane and perpendicular-to-plane resonance conditions.

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supporting

confidence: 86%

Two-magnon frequency-pulling effect in ferromagnetic resonance

Peria,

Yu,

Lee

et al. 2020

Preprint

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“…Taking into account the experimental value inferred for the perpendicular magnetic anisotropy, K FM = 3·10 6 erg/cm 3 , and M FM = 1100 emu cm −3 26 , it is inferred a Q of 0.3 in our samples and therefore, stripes are expected above a critical thickness. Considering A ex = 1.7·10 −6 erg cm −1 from the literature 22 , 23 , 40 , and using Eq. ( 5 ), it is obtained an experimental t cr of 44 nm.…”

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confidence: 99%

Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Hontecillas

Maícas

Andrés

et al. 2021

Sci Rep

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Here it is investigated the effect of the antiferromagnet Cr2O3 on the magnetic properties of ferromagnetic Fe72Ga28 thin films. Sputtered Fe72Ga28 layers have their magnetization in the sample plane with a magnetic fluctuation that gives rise to magnetic ripple. In order to turn its magnetization into the out of plane (OOP) direction, it has been magnetically coupled with Cr2O3 that has magnetic moments along the c-axis, that is the perpendicular direction when properly aligned. Cr2O3 has been obtained from Cr oxidation, whereas Fe72Ga28 has been deposited on top of it by sputtering in the ballistic regime. Although a uniaxial in-plane magnetic anisotropy is expected for Fe72Ga28 thickness above 100 nm, the interfacial coupling with Cr2O3 prevents this anisotropy. The formation of stripe domains in Fe72Ga28 above a critical thickness reveals the enhancement of the out of plane component of the Fe72Ga28 magnetization with respect to uncoupled layers. Due to the interface coupling, the Fe72Ga28 magnetization turns into the out-of-plane direction as its thickness is gradually reduced, and a perpendicular magnetic anisotropy of 3·106 erg·cm−3 is inferred from experimental results. Eventually, the coupling between Cr2O3 and Fe72Ga28 promotes an exchange-bias effect that has been well fitted by means of the random field model.

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“…1(c) by lines [29]. This allows us to attribute unambiguously the bands in the measured spectra in this (Fe,Ga) film to magnon modes [30]. It is interesting that the FFT obtained in a temporal window which starts 600 ps after the pump pulse [red line in Fig.…”

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confidence: 99%

Optical Excitation of Single- and Multimode Magnetization Precession in Fe - Ga Nanolayers

et al. 2019

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We demonstrate a variety of precessional responses of the magnetization to ultrafast optical excitation in nanolayers of Galfenol (Fe,Ga), which is a ferromagnetic material with large saturation magnetization and enhanced magnetostriction. The particular properties of Galfenol, including cubic magnetic anisotropy and weak damping, allow us to detect up to 6 magnon modes in a 120nm layer, and a single mode with effective damping α ef f = 0.005 and frequency up to 100 GHz in a 4nm layer. This is the highest frequency observed to date in time-resolved experiments with metallic ferromagnets. We predict that detection of magnetisation precession approaching THz frequencies should be possible with Galfenol nanolayers.

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Static and Dynamic Magnetic Properties of Sputtered Fe–Ga Thin Films

Cited by 35 publications

References 32 publications

Two-magnon frequency-pulling effect in ferromagnetic resonance

Two-magnon frequency-pulling effect in ferromagnetic resonance

Interfacial coupling effect of Cr2O3 on the magnetic properties of Fe72Ga28 thin films

Optical Excitation of Single- and Multimode Magnetization Precession in Fe - Ga Nanolayers

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