Spin caloritronic nano-oscillator

Safranski, Christopher; Barsukov, I.; Lee, Han Kyu; Schneider, Tobias; Jara, Alejandro; Smith, Andrew J.; Chang, Houchen; Lenz, K.; Lindner, J.; Tserkovnyak, Yaroslav; Wu, Mingzhong; Krivorotov, I. N.

doi:10.1038/s41467-017-00184-5

Cited by 114 publications

(81 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The low magnetic losses of BiYIG films could open new perspectives for magnetization dynamics control using spin-orbit torques 20,30,31 . For such phenomenon interface transparency to spin current is then the critical parameter which is defined using the effective spin-mixing conductance ( G ↑↓ ).…”

Section: Resultsmentioning

confidence: 99%

Ultra-low damping insulating magnetic thin films get perpendicular

Soumah¹,

Beaulieu²,

Qassym³

et al. 2018

Nat Commun

163

108

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Ultra-low damping insulating magnetic thin films get perpendicular

Soumah¹,

Beaulieu²,

Qassym³

et al. 2018

Nat Commun

163

108

View full text Add to dashboard Cite

show abstract

“…This is implemented by requiring ∂n(t)/∂t ≡ ∂ ∂t q n(q, t) = 0 and ∂ (t)/∂t ≡ ∂ ∂t q q n(q, t) = 0, that turn out in the pair of Eqs. (22) and (23).…”

Section: Appendix C: Self-consistent Relations: Chemical Potentials Amentioning

confidence: 96%

Many-body theory of spin-current driven instabilities in magnetic insulators

2019

View full text Add to dashboard Cite

We consider a magnetic insulator in contact with a normal metal. We derive a self-consistent Keldysh effective action for the magnon gas that contains the effects of magnon-magnon interactions and contact with the metal to lowest order. Self-consistent expressions for the dispersion relation, temperature and chemical potential for magnons are derived. Based on this effective action, we study instabilities of the magnon gas that arise due to spin-current flowing across the interface between the normal metal and the magnetic insulator. We find that the stability phase diagram is modified by an interference between magnon-magnon interactions and interfacial magnon-electron coupling. These effects persist at low temperatures and for thin magnetic insulators.

show abstract

“…Among them one can note classical magnon dynamics effects like parametrically stimulated recovery of a microwave signal, magnon wave‐front reversal, magnetic solitons and two‐dimensional spin‐wave bullets, strain‐induced magnon effects, nonreciprocity and transformation of spin waves in ferromagnetic‐semiconductor and ferromagnetic‐multiferroic structures, and many others. Simultaneously, novel quantum macroscopic collective phenomena, such as Bose–Einstein condensation (BEC) of magnons, magnon vortices and supercurrents, as well as a space‐time crystal in the magnon BEC open new directions for the utilization of the magnon system. The large variety of the effects in magnon systems is observed due to the manifold of multi‐magnon scattering processes in combination with the inherent nonlinearity in a magnetic medium.…”

Section: Introductionmentioning

confidence: 99%

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

Noack

Vasyuchka

Bozhko

et al. 2019

Physica Status Solidi (b)

View full text Add to dashboard Cite

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.

show abstract

Spin caloritronic nano-oscillator

Cited by 114 publications

References 60 publications

Ultra-low damping insulating magnetic thin films get perpendicular

Ultra-low damping insulating magnetic thin films get perpendicular

Many-body theory of spin-current driven instabilities in magnetic insulators

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

Contact Info

Product

Resources

About