{
  "id": "2403.11666",
  "version": "v2",
  "published": "2024-03-18T11:14:56.000Z",
  "updated": "2024-03-20T09:26:59.000Z",
  "title": "Skyrmion on Magnetic Tunnel Junction: Interweaving Quantum Transport with Micro-magnetism",
  "authors": [
    "Aashish Chahal",
    "Abhishek Sharma"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Over the last two decades, non-trivial magnetic textures, especially the magnetic skyrmion family, have been extensively explored out of fundamental interest, and diverse possible applications. Given the possible technological and scientific ramifications of skyrmion-texture on magnetic tunnel junction (ST-MTJ), in this work, we present non-equilibrium Green's function (NEGF) based description of ST-MTJs both for N\\'eel and Bloch textures, to capture the spin/charge current across different voltages, temperatures, and sizes. We predict the emergence of a textured spin current from the uniform layer of the ST-MTJs, along with a radially varying, asymmetrical voltage dependence of spin torque. We delineate the voltage-induced rotation of the spin current texture, coupled with the appearance of helicity in spin current, particularly in the case of N\\'eel skyrmions on MTJs. We describe the TMR roll-off in ST-MTJ with lower cross-sectional area and higher temperature based on transmission spectra analysis. We also introduce a computationally efficient coupled spatio-eigen framework of NEGF to address the 3D-NEGF requirement of the ST-MTJs. With analytical underpinning, we establish the generic nature of the spatio-eigen framework of NEGF, alleviating the sine-qua-non of the 3D-NEGF for systems that lack transnational invariance and simultaneous eigen-basis in the transverse directions.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2024-03-20T09:26:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magnetic tunnel junction",
      "interweaving quantum transport",
      "micro-magnetism",
      "spin current texture",
      "non-trivial magnetic textures"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}