Spin Seebeck effect and ballistic transport of quasi-acoustic magnons in room-temperature yttrium iron garnet films

Noack, Timo B.; Musiienko-Shmarova, Halyna Yu.; Langner, Thomas; Heussner, Frank; Lauer, V.; Heinz, Björn; Bozhko, Dmytro A.; Vasyuchka, Vitaliy I.; Pomyalov, Anna; L’vov, Victor S.; Hillebrands, B.; Serga, Alexander A.

doi:10.1088/1361-6463/aac0f1

Cited by 14 publications

(8 citation statements)

References 38 publications

(72 reference statements)

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“…This results in a strong thermal gradient through the YIG/Pt interface. In work we demonstrate a complex behavior of the thermal gradients in the YIG layer as a function of time and distance to the YIG/Pt interface under heating by similar microwave technique. This gradient generates a spin current due to the longitudinal spin Seebeck effect (LSSE) .…”

Section: Resultsmentioning

confidence: 93%

“…In work we demonstrate a complex behavior of the thermal gradients in the YIG layer as a function of time and distance to the YIG/Pt interface under heating by similar microwave technique. This gradient generates a spin current due to the longitudinal spin Seebeck effect (LSSE) . As opposed to the spin pumping from parametric magnons, the thermally induced spin current flows from Pt to YIG that results in the opposite polarity of the generated voltage.…”

Section: Resultsmentioning

confidence: 93%

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Enhancement of the Spin Pumping Effect by Magnon Confluence Process in YIG/Pt Bilayers

Noack

Vasyuchka

Bozhko

et al. 2019

Physica Status Solidi (b)

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The experimental investigation of the spin pumping process by dipolar‐exchange magnons parametrically excited in in‐plane magnetized yttrium iron garnet/platinum bilayers is presented. The electric voltage generated in the platinum layer via the inverse spin Hall effect (ISHE) results from contributions of two opposite spin currents formed by the longitudinal spin Seebeck effect and by the spin pumping from parametric magnons. In the field‐dependent measurements of the spin pumping‐induced component of the ISHE‐voltage, a clearly visible sharp peak is detected at high pumping powers. It is found that the peak position is determined by the process of confluence of two parametrically excited magnons into one magnon possessing twice the frequency and the sum of the wavevectors of the initial magnons. It is demonstrated that under the action of a rather strong parametric pumping field this confluence process results in the increase of the total number of magnons in the magnetic sample, and thus leads to the enhancement of the spin pumping effect.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 93%

Enhancement of the Spin Pumping Effect by Magnon Confluence Process in YIG/Pt Bilayers

Noack

Vasyuchka

Bozhko

et al. 2019

Physica Status Solidi (b)

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“…The ballistic flight of the magnons with energies above 20 K is a result of their almost linear dispersion law similar to that of acoustic phonons. By fitting the timedependent LSSE signal for different film thicknesses varying by almost an order of magnitude, it was found that the effective magnon propagation length of 435 nm is practically independent of the YIG film thickness [176]. This fact was considered as a strong support of a ballistic transport scenario of quasiacoustic magnons in YIG at room temperature.…”

Section: Magnon Caloritronicsmentioning

confidence: 81%

“…The improved method was applied recently to the transient behavior of the spin current generated by the LSSE in a set of platinum-coated YIG films of different thicknesses [176]. It was confirmed that that the time evolution of the LSSE is determined by the evolution of the thermal gradient triggering the flux of thermal magnons in a vicinity of the YIG/Pt interface.…”

Section: Magnon Caloritronicsmentioning

confidence: 91%

Recent Trends in Microwave Magnetism and Superconductivity

et al. 2019

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We review the development trends in microwave magnetism and superconductivity over the last five decades. The review contains the key results of recent studies related to the promising areas of modern magnetism and applied physics – spintronics, magnonics, magnon caloritronics, physics of magnonic crystals, spin-wave logic, and the development of novel micro- and nano-scale magnetic devices. The main achievements in these fields of physics are summarized and generalized.

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“…More recent works using different approaches to investigate this dependence circumvent the change of ∆T FM . For example, Noack et al studied the LSSE time evolution in YIG thin films heating with microwave pulses, finding Λ m ∼ 425 nm 43 ; and Venkat et al, using the heat flux method, reported Λ m = 19(2) nm for Fe 3 O 4 thin films 19 . Still, only the bulk effect is considered to explain the results.…”

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confidence: 99%

Quantification of the interfacial and bulk contributions to the longitudinal spin Seebeck effect

Jiménez-Cavero

Lucas

Bugallo

et al. 2021

Applied Physics Letters

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We report the disentanglement of bulk and interfacial contributions to the thermally excited magnon spin current in the spin Seebeck effect under static heating. For this purpose, we have studied the dependence of the inverse Spin Hall voltage and the thermal conductivity on the magnetic layer thickness. Knowledge of these quantities allows us to take into account the influence of both sources of thermal spin current in the analysis of the voltage dependence. The magnetic layer thickness modulates the relative magnitude of the involved thermal drops for a fixed total thermal difference throughout the sample. In the end, we attain the separate contributions of both sources of thermal spin current -bulk and interfacial-and obtain the value of the thermal magnon accumulation length scale in maghemite, which we find to be 29(1) nm. According to our results, bulk magnon accumulation dominates the spin Seebeck effect in our studied range of thicknesses, but the interfacial component is by no means negligible.

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Spin Seebeck effect and ballistic transport of quasi-acoustic magnons in room-temperature yttrium iron garnet films

Cited by 14 publications

References 38 publications

Enhancement of the Spin Pumping Effect by Magnon Confluence Process in YIG/Pt Bilayers

Enhancement of the Spin Pumping Effect by Magnon Confluence Process in YIG/Pt Bilayers

Recent Trends in Microwave Magnetism and Superconductivity

Quantification of the interfacial and bulk contributions to the longitudinal spin Seebeck effect

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