Spin-current nano-oscillator based on nonlocal spin injection

TLDR

Nonlocal spin injection efficiently generates pure spin currents without charge transfer. The study demonstrates that nonlocal spin injection can induce coherent magnetization dynamics for use as novel microwave nano‑sources in spintronic and magnonic applications. A simple quasilinear dynamical model is proposed to reproduce the oscillation characteristics. The nano‑oscillators exhibit a narrow linewidth, wide tunability via static magnetic field, a large oscillation area, and high thermal stability.

Abstract

Abstract Nonlocal spin injection has been recognized as an efficient mechanism for creation of pure spin currents not tied to the electrical charge transfer. Here we demonstrate experimentally that it can induce coherent magnetization dynamics, which can be utilized for the implementation of novel microwave nano-sources for spintronic and magnonic applications. We show that such sources exhibit a small oscillation linewidth and are tunable over a wide frequency range by the static magnetic field. Spatially resolved measurements of the dynamical magnetization indicate a relatively large oscillation area, resulting in a high stability of the oscillation with respect to thermal fluctuations. We propose a simple quasilinear dynamical model that reproduces well the oscillation characteristics.