6533b872fe1ef96bd12d40a5

RESEARCH PRODUCT

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

D. V. SlobodianiukGennadii A. MelkovOleksandr ProkopenkoDmytro A. BozhkoBjörn HeinzBjörn HeinzTimo B. NoackBurkhard HillebrandsPascal FreyVitaliy I. VasyuchkaAlexander A. SergaPeter Kopietz

subject

010302 applied physicsSpin pumpingMaterials scienceCondensed matter physicsField (physics)MagnonYttrium iron garnet02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsCondensed Matter::Materials Sciencechemistry.chemical_compoundchemistryExcited state0103 physical sciencesThermoelectric effectSpin Hall effectCondensed Matter::Strongly Correlated Electrons0210 nano-technologySpin-½

description

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.

yearjournalcountryeditionlanguage
2019-04-29physica status solidi (b)
https://doi.org/10.1002/pssb.201900121