Grain-size dependence of magnetic microstructure and high-frequency susceptibility of nanocrystalline thin films: A micromagnetic simulation study

Izotov, A. V.; Belyaev, B. A.; Solovev, P.N.; Boev, Nikita M.

doi:10.1016/j.jmmm.2021.167856

Cited by 10 publications

(6 citation statements)

References 63 publications

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“…The prediction of the LTR was supported qualitatively by our observations, illustrated in Figure 6, and quantitatively by numerical micromagnetic simulations [34]. The grainsize effects on the dispersion angle, as well as dependencies of the dispersion angle on the film thickness t F , exchange constant A, and local anisotropy, were in a reasonable agreement between computer simulations [34][35][36] and the LTR at a small dispersion angle, (<2 • ) and the deviation increased at larger <φ 2 > 1/2 . The limitation of the LTR by a small dispersion angle was originally recognized by Hoffmann [33], so deviation at <φ 2 > 1/2 > 2 • can be assigned to nonlinear effects.…”

Section: Microstructure and Micromagnetic Ripplesupporting

confidence: 78%

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FMR Damping in Thin Films with Exchange Bias

et al. 2021

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Ferromagnetic resonance (FMR) linewidth (LW) is a tool for studying the high frequency properties of magnetic materials for their application in high-speed devices. Here, we investigate different mechanisms which determine FMR damping in bilayer ferromagnetic/antiferromagnetic (F/AF and AF/F) exchange bias systems. Variations of FMR LW with the thickness and deposition order of the F and AF layers were studied, as well as their correlation with the exchange bias field and roughness of the sample surface. We observed much larger LW in AF/F structures compared with F/AF samples. It was found that neither the exchange bias nor surface/interface roughness in the samples could explain the difference in LW for F/AF and AF/F samples. Instead, the different underlayer microstructure influenced the grainsize, leading to different angular dispersion of magnetization and different internal stray field in F-layers, promoting a different intensity of magnon scattering and FMR damping in F/AF and AF/F samples.

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Section: Microstructure and Micromagnetic Ripplesupporting

confidence: 78%

“…Hoffman showed that the oscillation of EA and wiggling of the magnetization creates a so-called internal demagnetizing or stray field [33,35]…”

Section: Stray Field Effect On Fmr Line Position and Widthmentioning

confidence: 99%

FMR Damping in Thin Films with Exchange Bias

et al. 2021

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“…In addition to lattice mismatch, grain size can be controlled experimentally by the annealing temperature or the sintering temperature, which also has impacts on the magnetism. 125,126 In 2016, Goktas et al 127 studied the effects of grain size on the structural, magnetic and magnetoresistance properties of Nd 0.67 Ca 0.33 MnO 3 thin films and found the metal-insulator transition temperature, the paramagnetic-ferromagnetic transition temperature, and magnetoresistance increased with grain size. However, the effects of lattice mismatch and grain size on the magnon-phonon coupling are still unclear, and deserve further comprehensive investigation.…”

Section: Discussionmentioning

confidence: 99%

Magnon–phonon coupling: from fundamental physics to applications

Wang¹,

Ren²,

Hou³

et al. 2023

Phys. Chem. Chem. Phys.

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“…However, at lower frequencies, the experimental data for ∆H(f ) deviates from the linear dependence and tends to a value of about 5.5 Oe at f ≈ 0. It has been suggested that this behavior is caused by magnetic inhomogeneities in the film [38], and particularly by magnetization ripple observed in nanocrystalline samples [39][40][41][42]. By using experimental dependencies ∆H(f), f FMR (H 0 ), and equation ( 10), we can obtain the dependence of the (effective) damping parameter α on the applied field H 0 (figure 4(b)).…”

Section: Magnetic Characteristics Of the Samplementioning

confidence: 99%

Second harmonic generation in thin permalloy film

Solovev¹,

Afonin²,

Belyaev³

et al. 2021

J. Phys. D: Appl. Phys.

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Second harmonic generation versus strength and direction of the applied static magnetic field was measured for a thin permalloy (Ni80Fe20) film in a microstrip line at a driving frequency of 1 GHz and maximum input power of ∼110 mW. The measurements revealed two peaks in the double frequency signal—in the low static field (∼10 Oe) and the high one (∼45 Oe). To explain these findings, a macrospin model of a thin magnetic film with in-plane uniaxial magnetic anisotropy was considered. A perturbation expansion of the Landau–Lifshitz–Gilbert equation provided an explanation of the experimental data. The analysis of the model revealed that the low-field peak was caused by the longitudinal second-order magnetization component and the high-field peak by the transversal one. It was also shown that the uniaxial magnetic anisotropy of the film and the dependence of the magnetic damping parameter on the applied field play an important role in the process of the second harmonic generation. The results obtained give insights into some peculiarities of the nonlinear magnetization dynamics that are important in the development of magnetic film-based devices in the field of microwave signal processing and manipulation.

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Grain-size dependence of magnetic microstructure and high-frequency susceptibility of nanocrystalline thin films: A micromagnetic simulation study

Cited by 10 publications

References 63 publications

FMR Damping in Thin Films with Exchange Bias

FMR Damping in Thin Films with Exchange Bias

Magnon–phonon coupling: from fundamental physics to applications

Second harmonic generation in thin permalloy film

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