Acoustic excitation and electrical detection of spin waves and spin currents in hypersonic bulk waves resonator with YIG/Pt system

Abstract

We report on the self-consisted semi-analytical theory of magnetoelastic excitation and electrical detection of spin waves and spin currents in hypersonic bulk acoustic waves resonator with ZnO-GGG-YIG/Pt layered structure. Electrical detection of acoustically driven spin waves occurs due to spin pumping from YIG to Pt and inverse spin Hall (ISHE) effect in Pt as well as due to electrical response of ZnO piezotransducer. The frequency-field dependences of the resonator frequencies and ISHE voltage UISHE are correlated with experimental ones observed previously.Their fitting allows to determine some magnetic and magnetoelastic parameters of YIG. The analysis of the YIG film thickness influence on UISHE gives the possibility to find the optimal thickness for maximal UISHE value.

Coherent long-range transfer of angular momentum between magnon Kittel modes by phonons

“…When the latter acts as a phonon sink, the "phonon pumping" increases the magnetic damping [34]. The substrate of choice for YIG is single crystal gadolinium gallium garnet (GGG) which in itself has very long phonon mean-free path [35,36] and small impedance mismatch with YIG [37], raising the hope of a phonon-mediated dynamic exchange of coherence through a non-magnetic insulating layer [34].…”

Confined magnetoelastic waves in thin waveguides

“…To date, studies have addressed the effect of confinement on spin waves [46][47][48][49][50][51] as well as elastic waves [52][53][54][55][56][57][58][59][60]. Yet, besides recent investigations of the magnetoelastic coupling in nanoscale resonators [61][62][63][64][65], a detailed study of propagating magnetoelastic waves in nanoscale waveguides is still lacking. It is clear that a detailed understanding of confined propagating magnetoelastic waves is crucial for emerging magnonic device applications, especially where spin waves are excited by magnetoelectric means and used for information transfer and processing [41,42,66,67].…”

Магнон-Фононное Взаимодействие В Переходном Слое Эпитаксиальной Пленки ЖИГ

“…К их числу относятся пленочные структуры железоиттриевого граната (ЖИГ), выращенные на подложках гадолиний-галлиевого граната (ГГГ). Структуры ЖИГ−ГГГ имеют ряд существенных преимуществ: ЖИГ обладает наименьшими магнитными потерями [5,6]; монокристаллы ЖИГ и ГГГ являются превосходными звукопроводами [7][8][9]; акустические импедансы в ЖИГ и ГГГ практически совпадают [10].…”