Canted Spin Phase in Gadolinium Iron Garnet

Bernasconi, J.; Kuse, D.

doi:10.1103/physrevb.3.811

Cited by 36 publications

(21 citation statements)

References 12 publications

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“…A common approach to model the three magnetic sublattices in REIGs is to apply a mean field model with a Brillouin function describing each sublattice magnetization 108,111,[113][114][115] . This approach was first suggested by Bernasconi et al for gadolinium iron garnet (GdIG) 113 . In Fig.…”

Section: B Rare-earth Iron Garnetsmentioning

confidence: 99%

“…5 we show the numerical results obtained for such a model for (a) YIG and (b) GdIG doped with indium and yttrium ((In,Y)GdIG) using the parameters from Ref. 113 . The doping of GdIG lowers T comp from close to 300 K to below 100 K, which allows in the experiment to more easily gain access to the regimes above and below T comp .…”

Section: B Rare-earth Iron Garnetsmentioning

confidence: 99%

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Pure spin currents in magnetically ordered insulator/normal metal heterostructures

Althammer¹

2018

J. Phys. D: Appl. Phys.

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Pure spin currents, i.e. the transport of angular momentum without an accompanying charge current, represent a new, promising avenue in modern spintronics from both a fundamental and an application point of view. Such pure spin currents can not only flow in electrical conductors via mobile charge carriers, but also in magnetically ordered electrical insulators as a flow of spin excitation quanta. Over the course of the last years remarkable results have been obtained in heterostructures consisting of magnetically ordered insulators interfaced with a normal metal, where a pure spin current flows across the interface.This topical review article deals with the fundamental principles, experimental findings and recent developments in the field of pure spin currents in magnetically ordered insulators. We here put our focus onto four different manifestations of pure spin currents in such heterostructures: The spin pumping effect, the longitudinal spin Seebeck effect, the spin Hall magnetoresistance and the all-electrical detection of magnon transport in non-local device concepts. In this article, we utilize a common theoretical framework to explain all four effects and explain important material systems (especially rare-earth iron garnets) used in the experiments. For each effect we introduce basic measurement techniques and detection schemes and discuss their application in the experiment. We account for the remarkable progress achieved in each field by reporting the recent progress in each field and by discussing research highlights obtained in our group. Finally, we conclude the review article with an outlook on future challenges and obstacles in the field of pure spin currents in magnetically ordered insulator / normal metal heterostructures.This topical review aims to be a useful resource for introducing readers from the outside or just starting in this field, but also for providing perspective to those that already have an established understanding of the underlying physics. arXiv:1802.08479v1 [cond-mat.mes-hall]

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Section: B Rare-earth Iron Garnetsmentioning

confidence: 99%

Section: B Rare-earth Iron Garnetsmentioning

confidence: 99%

Pure spin currents in magnetically ordered insulator/normal metal heterostructures

Althammer¹

2018

J. Phys. D: Appl. Phys.

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“…Faraday rotation spectra were taken continuously as a function of wavelength on a spectrometer system similar to that described by Bernasconi and Kuse [24]. Here, the lowest temperature attainable was only 20 K. However, since the Faraday spectra did not change noticeably between 77 and 20 K, our 20 K data seem also to be representative for liquid helium temperature.…”

Section: Faraday Rotationmentioning

confidence: 98%

Optical absorption and Faraday rotation in yttrium iron garnet

Wettling

Andlauer

Koidl

et al. 1973

Physica Status Solidi (b)

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Optical absorption and Faraday rotation of yttrium iron garnet have been investigated in the spectral range of 1 to 0.35 pm, a t 300, 20, and 6 K. At wavelengths shorter than 0.7 pm the spectra were taken on thin films epitaxially grown on gadolinium-gallium garnet substrate.Optische Absorption and Faradaydrehung in Yttrium-Eisen-Granat wurden im Spektralbereich von 1 bis 0.35 pm analysiert, bei Temperaturen von 300, 20 und 6 K. Fur Wellenlangen kiirzer als 0,7 pm wurden die Spektren an YIG-Dunnfilmen aufgenommen, die epitaktisch auf Gadolinium-Gallium-Granat-Substrat gewachsen waren.

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“…28,29 One can be explained by the inversion of the sublattice magnetizations at T comp , where the net magnetization vanishes and the other can be attributed to the contributions of Ferrimagnetic resonance mode (α-mode) and a gapped optical magnon mode (β-mode). [28][29][30] The SMR experiments shows that GdIG has a canted configuration 31 and a sign change of SMR signal 32 at around T comp . Unlike in SSE, 28,29 the sign change of SMR is decided by the orientation of the sublattice magnetic moments associated with exchange interaction.…”

Section: Introductionmentioning

confidence: 97%

First-principles study of magnon-phonon interactions in gadolinium iron garnet

Wang

Xie

et al. 2020

Phys. Rev. B

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We obtained the spin-wave spectrum based on a first-principles method of exchange constants, calculated the phonon spectrum by the first-principles phonon calculation method, and extracted the broadening of the magnon spectrum, ∆ω, induced by magnon-phonon interactions in gadolinium iron garnet (GdIG). Using the obtained exchange constants, we reproduce the experimental Curie temperature and the compensation temperature from spin models using Metropolis Monte Carlo (MC) simulations. In the lower-frequency regime, the fitted positions of the magnon-phonon dispersion crossing points are consistent with the inelastic neutron scattering experiment. We found that the ∆ω and magnon wave vector k have a similar relationship in YIG. The broadening of the acoustic spin-wave branch is proportional to k 2 , while that of the YIG-like acoustic branch and the optical branch are a constant. At a specific k, the magnon-phonon thermalization time of τmp are approximately 10 −9 s, 10 −13 s, and 10 −14 s for acoustic branch, YIG-like acoustic branch, and optical branch, respectively. This research provides specific and effective information for developing a clear understanding of the spin-wave mediated spin Seebeck effect and complements the lack of lattice dynamics calculations of GdIG. arXiv:1912.10432v1 [cond-mat.mtrl-sci] 22 Dec 2019 Gd Fe T O J dc J ac J aa J dd J ad J aa J dd J ad J ac J dc J

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Canted Spin Phase in Gadolinium Iron Garnet

Cited by 36 publications

References 12 publications

Pure spin currents in magnetically ordered insulator/normal metal heterostructures

Pure spin currents in magnetically ordered insulator/normal metal heterostructures

Optical absorption and Faraday rotation in yttrium iron garnet

First-principles study of magnon-phonon interactions in gadolinium iron garnet

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