{
  "id": "2301.09228",
  "version": "v1",
  "published": "2023-01-22T23:34:50.000Z",
  "updated": "2023-01-22T23:34:50.000Z",
  "title": "Easy-plane spin Hall oscillator",
  "authors": [
    "Eric Arturo Montoya",
    "Amanatullah Khan",
    "Christopher Safranski",
    "Andrew Smith",
    "Ilya N. Krivorotov"
  ],
  "comment": "Main: 12 pages, 6 figures. Supplementary Material: 5 pages, 6 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Spin Hall oscillators (SHOs) based on bilayers of a ferromagnet (FM) and a non-magnetic heavy metal (HM) are electrically tunable nanoscale microwave signal generators. Achieving high output power in SHOs requires driving large-amplitude magnetization dynamics by a direct spin Hall current. The maximum possible amplitude of such oscillations with the precession cone angle nearing $90^\\circ$ is predicted for FM layers with easy-plane magnetic anisotropy and spin Hall current polarization perpendicular to the easy plane. While many FMs exhibit natural easy-plane anisotropy in the FM film plane, the spin Hall current in a HM|FM bilayer is polarized in this plane and thus cannot drive large-amplitude magneto-dynamics. Here we present a new type of SHO engineered to have the easy-plane anisotropy oriented normal to the film plane, enabling large-amplitude easy-plane dynamics driven by spin Hall current. Our experiments and micromagnetic simulations demonstrate that the desired easy-plane anisotropy can be achieved by tuning the magnetic shape anisotropy and perpendicular magnetic anisotropy in a nanowire SHO, leading to a significant enhancement of the generated microwave power. The easy-plane SHO experimentally demonstrated here is an ideal candidate for realization of a spintronic spiking neuron. Our results provide a new approach to design of high-power SHOs for wireless communications, neuromorphic computing, and microwave assisted magnetic recording.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-01-22T23:34:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "easy-plane spin hall oscillator",
      "spin hall current",
      "hall current polarization perpendicular",
      "large-amplitude easy-plane dynamics driven",
      "nanoscale microwave signal generators"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}