Magnetoelastic Gilbert damping in magnetostrictive 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ga</mml:mi><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
 thin films

Peria, W. K.; Wang, X.; Yu, Heshan; Lee, Seunghun; Takeuchi, Ichiro; Crowell, P. A.

doi:10.1103/physrevb.103.l220403

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…This assumption is physically reasonable, considering that Gilbert damping is theoretically expected to be isotropic in Fe films near room temperature 40 . While a recent study has reported anisotropic Gilbert damping that scales quadratically with magnetostriction 46 , this effect is likely negligible in elemental Fe whose magnetostriction is several times smaller 47,48 than that of the Fe 0.7 Ga 0.3 alloy in Ref. 46 .…”

Section: Extrinsic Magnetic Relaxation Probed By In-plane Fmrmentioning

confidence: 94%

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Room-Temperature Intrinsic and Extrinsic Damping in Polycrystalline Fe Thin Films

Wu,

Smith,

Nakarmi

et al. 2021

Preprint

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We examine magnetic relaxation in polycrystalline Fe films with strong and weak crystallographic texture. Out-of-plane ferromagnetic resonance (FMR) measurements reveal Gilbert damping parameters of ≈ 0.0024 for Fe films with thicknesses of 4-25 nm, regardless of their microstructural properties. The remarkable invariance with film microstructure strongly suggests that intrinsic Gilbert damping in polycrystalline Fe is a local property of nanoscale crystal grains, with limited impact from grain boundaries and film roughness. By contrast, the in-plane FMR linewidths of the Fe films exhibit distinct nonlinear frequency dependences, indicating the presence of strong extrinsic damping. To fit our experimental data, we have used a grain-to-grain two-magnon scattering model with two types of correlation functions aimed at describing the spatial distribution of inhomogeneities in the film. However, neither of the two correlation functions is able to reproduce the experimental data quantitatively with physically reasonable parameters. Our finding points to the need to further examine the fundamental impact of film microstructure on extrinsic damping.

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Section: Extrinsic Magnetic Relaxation Probed By In-plane Fmrmentioning

confidence: 94%

“…While a recent study has reported anisotropic Gilbert damping that scales quadratically with magnetostriction 46 , this effect is likely negligible in elemental Fe whose magnetostriction is several times smaller 47,48 than that of the Fe 0.7 Ga 0.3 alloy in Ref. 46 .…”

Section: Extrinsic Magnetic Relaxation Probed By In-plane Fmrmentioning

confidence: 94%

Room-Temperature Intrinsic and Extrinsic Damping in Polycrystalline Fe Thin Films

Wu,

Smith,

Nakarmi

et al. 2021

Preprint

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In situ electric-field control of ferromagnetic resonance in the low-loss organic-based ferrimagnet V[TCNE]x∼2

Kurfman,

Franson,

Shah

et al. 2024

APL Materials

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We demonstrate indirect electric-field control of ferromagnetic resonance (FMR) in devices that integrate the low-loss, molecule-based, room-temperature ferrimagnet vanadium tetracyanoethylene (V[TCNE]x∼2) mechanically coupled to PMN-PT piezoelectric transducers. Upon straining the V[TCNE]x films, the FMR frequency is tuned by more than 6 times the resonant linewidth with no change in Gilbert damping for samples with α = 6.5 × 10−5. We show this tuning effect is due to a strain-dependent magnetic anisotropy in the films and find the magnetoelastic coefficient |λs| ∼ (1–4.4) ppm, backed by theoretical predictions from density-functional theory calculations and magnetoelastic theory. Noting the rapidly expanding application space for strain-tuned FMR, we define a new metric for magnetostrictive materials, magnetostrictive agility, given by the ratio of the magnetoelastic coefficient to the FMR linewidth. This agility allows for a direct comparison between magnetostrictive materials in terms of their comparative efficacy for magnetoelectric applications requiring ultra-low loss magnetic resonance modulated by strain. With this metric, we show V[TCNE]x is competitive with other magnetostrictive materials, including YIG and Terfenol-D. This combination of ultra-narrow linewidth and magnetostriction, in a system that can be directly integrated into functional devices without requiring heterogeneous integration in a thin film geometry, promises unprecedented functionality for electric-field tuned microwave devices ranging from low-power, compact filters and circulators to emerging applications in quantum information science and technology.

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Temperature dependent intrinsic Gilbert damping in magnetostrictive FeCoSiB thin film

Zhang

Jin

et al. 2023

AIP Advances

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A low Gilbert damping factor is crucial for emerging magneto-acoustic devices. In current work, angle-dependent and temperature-dependent Gilbert damping of magnetostrictive FeCoSiB thin films have been investigated using electron spin resonance (ESR) and vector network analyzer ferromagnetic resonance (VNA-FMR) techniques, respectively. A very low Gilbert damping factor ∼0.0038 was measured with in-plane magnetic fields at room temperature. Temperature-dependent VNA-FMR results between 10 K and 300 K exhibit a conductivity-like damping feature, which can be attributed to the spin-orbital coupling dominantly controlled by the intraband scattering. Our results clearly indicate that highly magnetostrictive or piezomagnetic film does not necessarily have a high intrinsic damping factor.

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Magnetoelastic Gilbert damping in magnetostrictive Fe0.7Ga0.3 thin films

Cited by 8 publications

References 31 publications

Room-Temperature Intrinsic and Extrinsic Damping in Polycrystalline Fe Thin Films

Room-Temperature Intrinsic and Extrinsic Damping in Polycrystalline Fe Thin Films

In situ electric-field control of ferromagnetic resonance in the low-loss organic-based ferrimagnet V[TCNE]x∼2

Temperature dependent intrinsic Gilbert damping in magnetostrictive FeCoSiB thin film

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