Effect of Slow Ion Relaxation at Ferromagnetic Resonance in a CoFeB-LiNbO Metal-Insulator Nanocomposite

Дровосеков, А. Б.; Крейнес, Н. М.; Barkalova, Anastasia; Николаев, С. Н.; Sitnikov, A. V.; Rylkov, V. V.

doi:10.1134/s0021364020140088

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…The peak-behavior at low T is characteristic of damping effects due to slowly relaxing impurities and we observe good agreement of our experimental data with a fit given by the product of Eqs. ( 4) and ( 5) to our data for T ≤ 50 K. We obtain the fitting parameters E slow = (0.50 ± 0.04) meV and C • T = (66 ± 4) GHz•K, which are comparable to previous results for slowly relaxing impurities in literature [24,46]. A potential mechanism to explain the increase in CF (T ) for T > 150 K is discussed in Section IV.…”

Section: B Dynamic Magnetic Propertiessupporting

confidence: 86%

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Reduced effective magnetization and damping by slowly-relaxing impurities in strained $γ$-$\mathrm{Fe_2O_3}$ thin films

Müller¹,

Scheufele²,

Gückelhorn³

et al. 2022

Preprint

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Section: B Dynamic Magnetic Propertiessupporting

confidence: 86%

“…We obtain E A = (3.3 ± 0.6) meV and τ 0 = (19.9 ± 0.1) ps, which correspond well to results in Refs. [46,49]. In the Appendix A, these results are compared to those of the 45 nm thick maghemite film.…”

Section: B Dynamic Magnetic Propertiesmentioning

confidence: 99%

Reduced effective magnetization and damping by slowly-relaxing impurities in strained $γ$-$\mathrm{Fe_2O_3}$ thin films

Müller¹,

Scheufele²,

Gückelhorn³

et al. 2022

Preprint

View full text Add to dashboard Cite

Reduced effective magnetization and damping by slowly relaxing impurities in strained γ-Fe2O3 thin films

Müller

Scheufele

Gückelhorn

et al. 2022

Journal of Applied Physics

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Magnetically ordered insulators are of key interest for spintronics applications, but most of them have not yet been explored in depth regarding their magnetic properties, in particular with respect to their dynamic response. We study the static and dynamic magnetic properties of epitaxially strained [Formula: see text]-Fe2O3 (maghemite) thin films grown via pulsed-laser deposition on MgO substrates by SQUID magnetometry and cryogenic broadband ferromagnetic resonance experiments. SQUID magnetometry measurements reveal hysteretic magnetization curves for magnetic fields applied both in- and out of the sample plane. From the magnetization dynamics of our thin films, we find a small negative effective magnetization in agreement with a strain induced perpendicular magnetic anisotropy. Moreover, we observe a non-linear evolution of the ferromagnetic resonance-linewidth as a function of the microwave frequency and explain this finding with the so-called slow relaxor model. We investigate the magnetization dynamics and non-linear damping mechanisms present in our samples as a function of frequency and temperature and in particular, observe a sign change in the effective magnetization from the transition of the magnetic anisotropy from a perpendicular easy axis to an easy in-plane anisotropy for reduced temperatures. Its nonlinear damping properties and strain-induced perpendicular anisotropy render [Formula: see text]-Fe2O3 an interesting material platform for spintronics devices.

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Magnetic Resonance in Metal–Insulator Nanogranular Composites with Paramagnetic Ions in an Insulating Matrix

Дровосеков

Крейнес

Kovalev

et al. 2022

J. Exp. Theor. Phys.

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Effect of Slow Ion Relaxation at Ferromagnetic Resonance in a CoFeB-LiNbO Metal-Insulator Nanocomposite

Cited by 5 publications

References 14 publications

Reduced effective magnetization and damping by slowly-relaxing impurities in strained $γ$-$\mathrm{Fe_2O_3}$ thin films

Reduced effective magnetization and damping by slowly-relaxing impurities in strained $γ$-$\mathrm{Fe_2O_3}$ thin films

Reduced effective magnetization and damping by slowly relaxing impurities in strained γ-Fe2O3 thin films

Magnetic Resonance in Metal–Insulator Nanogranular Composites with Paramagnetic Ions in an Insulating Matrix

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