Spin Hall oscillators (SHOs) based on ferromagnet (FM)/heavy metal (HM) bilayers are electrically tunable nanoscale microwave signal generators. High output power requires large-amplitude magnetization dynamics driven by a direct spin Hall current. This research presents an SHO with easy-plane magnetic anisotropy oriented normal to the bilayer plane, enabling large-amplitude dynamics driven by the spin Hall current. Experiments and micromagnetic simulations show that tuning magnetic shape anisotropy and perpendicular magnetic anisotropy in a nanowire SHO enhances microwave power. The easy-plane SHO is a candidate for a spintronic spiking neuron, with applications in wireless communications, neuromorphic computing, and microwave-assisted magnetic recording.

Eric Arturo Montoya, Amanatullah Khan, Christopher Safranski, Andrew Smith, Ilya N. Krivorotov