Amplification of Spin Waves by Thermal Spin-Transfer Torque

Padrón-Hernández, E.; Azevedo, A.; Rezende, S. M.

doi:10.1103/physrevlett.107.197203

Cited by 92 publications

(61 citation statements)

References 34 publications

(47 reference statements)

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“…Padrón-Hernández et al [93] found that magnon wavepackets propagating along a YIG film are amplified when a temperature gradient is applied perpendicular to the YIG film. This experiment implies that the magnon damping term is canceled by the action of the temperature gradient, which leads to an amplification of the magnon wavepacket.…”

Section: Effects Of Heat Current On Magnon Dynamicsmentioning

confidence: 99%

Theory of the spin Seebeck effect

et al. 2013

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Abstract. The spin Seebeck effect refers to the generation of a spin voltage caused by a temperature gradient in a ferromagnet, which enables the thermal injection of spin currents from the ferromagnet into an attached nonmagnetic metal over a macroscopic scale of several millimeters. The inverse spin Hall effect converts the injected spin current into a transverse charge voltage, thereby producing electromotive force as in the conventional charge Seebeck device. Recent theoretical and experimental efforts have shown that the magnon and phonon degrees of freedom play crucial roles in the spin Seebeck effect. In this article, we present the theoretical basis for understanding the spin Seebeck effect and briefly discuss other thermal spin effects.

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Section: Effects Of Heat Current On Magnon Dynamicsmentioning

confidence: 99%

Theory of the spin Seebeck effect

et al. 2013

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“…The thickness of the YIG is only 200 nm, which is very low compared to other studies. 6,11,12,20,21 The YIG layer has a roughness of 0.4 nm. X-ray diffraction was used in order to estimate the quality of the thin layer of YIG.…”

Section: A Sample Descriptionmentioning

confidence: 99%

Frequency and power dependence of spin-current emission by spin pumping in a thin-film YIG/Pt system

Castel

Vlietstra²,

Wees³

et al. 2012

Phys. Rev. B

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Frequency and power dependence of spin-current emission by spin pumping in a thin-film YIG/Pt system Castel, V.; Vlietstra, N.; van Wees, B. J.; Ben Youssef, J. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. This paper presents the frequency dependence of the spin-current emission by spin pumping in a hybrid ferrimagnetic insulator/normal metal system. The system is based on a ferrimagnetic insulating thin film of yttrium iron garnet (YIG, 200 nm) grown by liquid-phase epitaxy coupled with a normal metal with a strong spin-orbit coupling (Pt, 15 nm). The YIG layer presents an isotropic behavior of the magnetization in the plane, a small linewidth, and a roughness lower than 0.4 nm. Here we discuss how the voltage signal from the spin-current detector depends on the frequency (0.6-7 GHz), the microwave power, P in (1-70 mW), and the in-plane static magnetic field. A strong enhancement of the spin-current emission is observed at low frequencies, showing the appearance of nonlinear phenomena.

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“…In addition, this heating probably leads to substantial changes in the magnetic properties, for instance in the exchange bias field of the reference layers. Finally, the temperature gradients are unusually strong, and may lead to additional sources of spin torques [25] that can play a role in the magnetization dynamics. Our findings imply that taking into account the current-induced heating at the nanoscale is essential for the understanding of magnetization dynamics in nanocontact systems.…”

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Understanding Nanoscale Temperature Gradients in Magnetic Nanocontacts

et al. 2012

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We determine the temperature profile in magnetic nanocontacts submitted to the very large current densities that are commonly used for spin-torque oscillator behavior. Experimentally, the quadratic current-induced increase of the resistance through Joule heating is independent of the applied temperature from 6 K to 300 K. The modeling of the experimental rate of the current-induced nucleation of a vortex under the nanocontact, assuming a thermally-activated process, is consistent with a local temperature increase between 150 K and 220 K. Simulations of heat generation and diffusion for the actual tridimensional geometry were conducted. They indicate a temperatureindependent efficiency of the heat sinking from the electrodes, combined with a localized heating source arising from a nanocontact resistance that is also essentially temperature-independent. For practical currents, we conclude that the local increase of temperature is typically 160 K and it extends 450 nm about the nanocontact. Our findings imply that taking into account the currentinduced heating at the nanoscale is essential for the understanding of magnetization dynamics in nanocontact systems.

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Amplification of Spin Waves by Thermal Spin-Transfer Torque

Cited by 92 publications

References 34 publications

Theory of the spin Seebeck effect

Theory of the spin Seebeck effect

Frequency and power dependence of spin-current emission by spin pumping in a thin-film YIG/Pt system

Understanding Nanoscale Temperature Gradients in Magnetic Nanocontacts

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