Ferromagnetic relaxation in yttrium-iron garnet and the relation to applications

Spencer, E. G.; LeCraw, R. C.

doi:10.1049/pi-b-2.1962.0013

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…However, the FMR results indicate the high quality of the material and the resulting low damping of LPE grown YIG films [33]. Additionally, Spencer and LeCraw [34] have shown that the magnetic damping constant α of a YIG single crystal depends approximately linearly on the temperature where our LSSE experiments are carried out (with slight variations due to the inherent microstructure defects). While the applicability of this temperature dependence for all thin films grown by different methods is not obvious, such a linear temperature dependence of the Gilbert damping in combination with its inverse proportionality leads to the observed ξ ∼ T −1 dependence, which agrees well with our experiments [ Fig.…”

Section: Resultsmentioning

confidence: 83%

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

et al. 2016

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The temperature-dependent longitudinal spin Seebeck effect (LSSE) in heavy metal ðHMÞ=Y 3 Fe 5 O 12 (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection materials. The LSSE signal shows a large enhancement with reductions in temperature, leading to a pronounced peak at low temperatures. We find that the LSSE peak temperature strongly depends on the film thickness as well as on the magnetic field. Our result can be well explained in the framework of magnon-driven LSSE by taking into account the temperature-dependent effective propagation length of thermally excited magnons in the bulk of the material. We further demonstrate that the LSSE peak is significantly shifted by changing the interface coupling to an adjacent detection layer, revealing a more complex behavior beyond the currently discussed bulk effect. By direct microscopic imaging of the interface, we correlate the observed temperature dependence with the interface structure between the YIG and the adjacent metal layer. Our results highlight the role of interface effects on the temperature-dependent LSSE in HM/YIG system, suggesting that the temperature-dependent spin current transparency strikingly relies on the interface conditions.

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Section: Resultsmentioning

confidence: 83%

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

et al. 2016

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“…Such a temperature difference may originate, e.g., from diffusive [12] or stochastic [16] transport or by considering "subthermal" magnons [11,14,33]. While data at elevated temperatures are sparse, low-temperature measurements [33] and the relatively long lifetime of the small-wave-number k magnons [34] even at room temperature suggest that the thermalization process between magnons and phonons is the limiting factor for highfrequency spin Seebeck excitations. The interaction with the other thermal reservoir, the electrons in the normal metal, can be assumed instantaneous in the experimentally accessed frequency range as spin current emission has been demonstrated for much higher frequencies, e.g., in spin pumping [7] or spin Hall magnetoresistance [35] experiments.…”

Section: Discussionmentioning

confidence: 99%

Spin Seebeck effect at microwave frequencies

et al. 2016

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We experimentally study the transient voltage response of yttrium iron garnet/platinum bilayer samples subject to periodic heating up to gigahertz frequencies. We observe an intrinsic cutoff frequency of the induced thermopower voltage, which characteristically depends on the thickness of the yttrium iron garnet film. The cutoff frequency reaches values of up to 350 MHz in a 50 nm thick yttrium iron garnet film, but drops to below 1 MHz for several-micrometer-thick films. These data corroborate the notion that the magnon spectrum responsible for the spin current emission in the spin Seebeck effect can be shaped by tuning the thickness of the ferromagnetic layer.

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“…While it is relatively large for microwave magnons 46,47 it decreases significantly for short wavelength, thermal magnons. 28 Assuming that the majority of the magnetic damping in the YIG is due to the interaction with phonons, one can estimate τ mp by (cf.…”

Section: -4mentioning

confidence: 95%

Magnon, phonon, and electron temperature profiles and the spin Seebeck effect in magnetic insulator/normal metal hybrid structures

et al. 2013

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We calculate the phonon, electron, and magnon temperature profiles in yttrium iron garnet/platinum bilayers by diffusive theory with appropriate boundary conditions, in particular taking into account interfacial thermal resistances. Our calculations show that in thin film hybrids, the interface magnetic heat conductance qualitatively affects the magnon temperature. Based on published material parameters we assess the degree of nonequilibrium at the yttrium iron garnet/platinum interface. The magnitude of the spin Seebeck effect derived from this approach compares well with experimental results for the longitudinal spin Seebeck effect. Additionally, we address the temperature profiles in the transverse spin Seebeck effect.

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Ferromagnetic relaxation in yttrium-iron garnet and the relation to applications

Cited by 7 publications

References 10 publications

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

Spin Seebeck effect at microwave frequencies

Magnon, phonon, and electron temperature profiles and the spin Seebeck effect in magnetic insulator/normal metal hybrid structures

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