Alekseev S., Pyataikin I., Polzikova N., Kotelyanskii I., Luzanov V., Raevskiy A., Galchenkov L. Elastically driven magnetic excitations for acoustic spin pumping in ZnO–GGG–YIG–Pt - bulk acoustic wave resonator. In: International Conference “Micro- and Nanoelectronics – 2016” (ICMNE - 2016), 3 - 7 октября 2016 г., Звенигород , МАКС Пресс , р. 63.
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Аннотация
Non-magnetic ways of exciting magnetic oscillations, in particular due to strain mediated coupling between the electric field in a piezoelectric film and magnetization in a magnetostrictive ferromagnetic layer, are quite topical today because of possible applications in strain-tunable spintronic devices, magnetoelectric spin wave logic circuits, and sensors. Acoustic spin pumping (ASP), the generation of spin currents from a magnetization precession excited by a microwave phonons, has attracted much attention recently. The possibility for pure spin current generation based on acoustic driving magnetic dynamics both under magnetoelastic resonance (MER) [1] and the off-resonance conditions [2] has been demonstrated. In [3, 4] we showed theoretically and observed experimentally that excitation of non-uniform ferromagnetic resonance (FMR) occurs in a Al-ZnO-Al-GGG-YIG high overtone bulk acoustic wave resonator (HBAR) at frequencies close to the ones of MER. Magnetic oscillations in YIG arise because of spatially inhomogeneous strain and manifest themselves as HBAR resonance frequency shift Δf_n(H) at magnetic fields H corresponding to MER, when HBAR resonance frequency f_n(H) is close to FMR frequency. The generation of pure spin current in such HBAR has been demonstrated recently in [5]. Magnetic dynamics excited acoustically in the YIG film induces spin current from it into a thin layer of platinum deposited on the YIG. This spin-polarized current is transformed to electrical current by means of the inverse spin Hall effect (ISHE). Here, we report some important features of generation of pure spin current in such a system caused by crystal and magnetoelastic anisotropy. Namely, the effect of the mutual orientation of the transverse acoustic wave polarization (established by the projection of ZnO texture axis on a plane (111) of epitaxial YIG films), the bias magnetic field and the platinum strip on the maximal value of HBAR frequency shift (Δf_n) and ISHE voltage (U_ISHE) has been studied in detail. We found that, in contrast to the standard sinusoidal dependence of U_ISHE versus angle ϕ between the magnetizing field and Pt strip observed at electromagnetic excitation by cavities or striplines, the angular dependence of U_ISHE(ϕ) at ASP in HBAR is subject to more complex law. This is because only transverse acoustic waves with the components of particle displacement parallel to the bias field are able to excite magnetic oscillations. A model is proposed to explain the observed behavior of U_ISHE(ϕ) and Δf_n (ϕ). Fitting the experimental curves with the obtained theoretical dependences allowed us to determine the location of projection of ZnO texture axis in the plane (111) of YIG. The locations extracted from U_ISHE(ϕ) and Δf_n(ϕ) measurements are in good agreement with each other. It is concluded that in order to obtain the maximal value of U_ISHE, the piezoelectric texture axis of ZnO should be oriented towards the direction that is perpendicular to the axis of the platinum strip and parallel to the crystallographic axis <-1 1 0 > of YIG film.
| Тип объекта: | Доклад на конференции или семинаре (Доклад) |
|---|---|
| Авторы на русском. ОБЯЗАТЕЛЬНО ДЛЯ АНГЛОЯЗЫЧНЫХ ПУБЛИКАЦИЙ!: | Алексеев С. Г., Пятайкин И. И., Ползикова Н. И., Котелянский И. М., Лузанов В. А., Раевский А. О., Галчёнков Л. А. |
| Подразделения (можно выбрать несколько, удерживая Ctrl): | 171 лаб. полупроводниковых приборов 216 лаб. технологических процессов твердотельной электроники |
| URI: | http://cplire.ru:8080/id/eprint/4467 |
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