Growth-induced anisotropy in bismuth: Rare-earth iron garnets

Fratello, V. J.; Slusky, S. E. G.; Brandle, C. D.; Norelli, M. P.

doi:10.1063/1.337163

Cited by 41 publications

(6 citation statements)

References 44 publications

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“…This ensures better and better coherence of the magnetization precession, limiting the magnetic losses, and thus reducing the magnetic damping to its intrinsic value. Indeed, the obtained values of α fmr at high H ext are in good agreement with the ones reported in the literature for GdIG [59], Bi-substituted GdIG [60], and (Yb,Bi)-substituted GdIG [61].…”

Section: Resultssupporting

confidence: 90%

Magnetic damping of ferromagnetic and exchange resonance modes in a ferrimagnetic insulator

2022

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Understanding the damping is an important fundamental problem with widespread implications in magnetic technology. Ferrimagnetic materials offer a rich platform to explore not only the damping of the ferromagnetic mode, but also the damping of the high-frequency exchange mode very promising for ultrafast devices. Here we use time-resolved magneto-optical Kerr effect to investigate the ferromagnetic and exchange resonance modes and their damping in the bismuth-doped gadolinium iron garnet over a broad range of magnetic fields (0-10 T) and temperatures (50-300 K) including the magnetization and angular compensation points. These two resonance modes are excited via the inverse Faraday effect and unambiguously identified by their distinct frequency dependence on temperature and magnetic field. The temperature-dependent measurements in the external magnetic field H ext = 2 T revealed that the intrinsic damping of the ferromagnetic mode is always smaller than the one of the exchange modes and both have a maximum near the angular compensation point. These results are fully consistent with recent predictions of atomistic simulations and a theory based on two-sublattice Landau-Lifshitz-Bloch equation. We also demonstrate that the damping of these modes varies differently as a function of H ext . We explain the observed behaviors by considering the different features of the effective fields defining the precession frequencies of the ferromagnetic and exchange modes.

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Section: Resultssupporting

confidence: 90%

Magnetic damping of ferromagnetic and exchange resonance modes in a ferrimagnetic insulator

2022

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“…It is noted that the effective anisotropy of our garnets are at least an order of magnitude smaller than those typically reported for other rare‐earth iron garnets. [ 42–44 ] The out‐of‐plane hysteresis loops show that the films are magnetically hard, which produces a remnant moment and non‐negligible coercivity when magnetized perpendicular to the film surface. Nevertheless, the effective anisotropy from both calculation and measurement show a preference to in‐plane magnetization that is consistent with the positive magnetostriction coefficient and lower in‐plane saturation field (from hysteresis loops in Figure S4, Supporting Information) for our garnets.…”

Section: Resultsmentioning

confidence: 99%

Interfacial and Bulk Magnetic Properties of Stoichiometric Cerium Doped Terbium Iron Garnet Polycrystalline Thin Films

Srinivasan

Radu

Bilardello

et al. 2020

Adv Funct Materials

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One of the best magneto-optical claddings for optical isolators in photonic integrated circuits is sputter deposited cerium-doped terbium iron garnet (Ce:TbIG) which has a large Faraday rotation (≈−3500° cm −1 at 1550 nm). Near-ideal stoichiometryCe Tb Fe 0.57 + + = =       of Ce 0.5 Tb 2.5 Fe 4.75 O 12 is found to have a 44 nm magnetic dead layer that can impede the interaction of propagating modes with garnet claddings. The effective anisotropy of Ce:TbIG on Si is also important, but calculations using bulk thermal mismatch overestimate the effective anisotropy. X-ray diffraction measurements yield highly accurate measurements of strain that show anisotropy favors an in-plane magnetization in agreement with the positive magnetostriction of Ce:TbIG. Upon doping TbIG with Ce, a slight decrease in compensation temperature occurs which points to preferential rare-earth occupation in dodecahedral sites and an absence of cation redistribution between different lattice sites. The high Faraday rotation, large remanent ratio, large coercivity, and preferential in-plane magnetization enable Ce:TbIG to be an in-plane latched garnet, immune to stray fields with magnetization collinear to direction of light propagation.

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“…The study of micron-thick YIG films grown by liquid phase epitaxy (LPE) was among the hottest topics in magnetism few decades ago. At this time, it has been already noticed that unlike rare earths (Thulium, Terbium, Dysprosium …) substitutions, Bi substitution does not overwhelmingly increase the magnetic losses 10,11 even though it induces high uniaxial magnetic anisotropy [12][13][14] . Very recently, ultra-thin MI films showing PMA have been the subject of an increasing interest 15,16 : Tm3Fe5O12 or BaFe12O19 (respectively a garnet and an hexaferrite) have been used to demonstrate spin-orbit-torque magnetization reversal using a Pt over-layer as a source of spin current 4,17,18 .…”

Section: Introductionmentioning

confidence: 99%

Ultra-low damping insulating magnetic thin films get perpendicular

Soumah¹,

Beaulieu²,

Qassym³

et al. 2018

Nat Commun

177

108

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A magnetic material combining low losses and large perpendicular magnetic anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields. We report here on the growth of ultrathin Bismuth doped Y3Fe5O12 (BiYIG) films on Gd3Ga5O12 (GGG) and substituted GGG (sGGG) (111) oriented substrates. A fine tuning of the PMA is obtained using both epitaxial strain and growth-induced anisotropies. Both spontaneously in-plane and out-of-plane magnetized thin films can be elaborated. Ferromagnetic Resonance (FMR) measurements demonstrate the high-dynamic quality of these BiYIG ultrathin films; PMA films with Gilbert damping values as low as 3 × 10−4 and FMR linewidth of 0.3 mT at 8 GHz are achieved even for films that do not exceed 30 nm in thickness. Moreover, we measure inverse spin hall effect (ISHE) on Pt/BiYIG stacks showing that the magnetic insulator’s surface is transparent to spin current, making it appealing for spintronic applications.

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Growth-induced anisotropy in bismuth: Rare-earth iron garnets

Cited by 41 publications

References 44 publications

Magnetic damping of ferromagnetic and exchange resonance modes in a ferrimagnetic insulator

Magnetic damping of ferromagnetic and exchange resonance modes in a ferrimagnetic insulator

Interfacial and Bulk Magnetic Properties of Stoichiometric Cerium Doped Terbium Iron Garnet Polycrystalline Thin Films

Ultra-low damping insulating magnetic thin films get perpendicular

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