{
  "annotation_id": "1dfe0feb-d7c9-4ce8-9510-3a4de0015703",
  "date_created": "2026-02-17T05:53:03.732000Z",
  "date_modified": "2026-02-17T05:53:03.732000Z",
  "file_hash": "05820895f303651056243ecf54dad5faccb2f4c05d9431784009f2460243b305",
  "private": false,
  "record": {
    "abstract": "Here, we report spin-selective transport and exceptionally large positive junction magnetoresistance (JMR) in sputter-deposited Mn$_2$CoAl/native-SiO$_2$/p-Si heterostructures. Highly ordered inverse-Heusler Mn$_2$CoAl thin films with near-ideal XA chemical ordering ($S \\approx 0.97$) and a Curie temperature of $\\sim \\SI{590}{\\kelvin}$ are realized using a magnetron sputtering process. The spin-gapless semiconducting nature of Mn$_2$CoAl is experimentally supported by a weakly temperature-dependent resistivity with a very small negative temperature coefficient of resistance (TCR $\\approx -4.2 \\times 10^{-9}$~$\\si{\\ohm\\meter\\per\\kelvin}$) and a nonsaturating linear magnetoresistance over a wide range of magnetic fields and temperatures.\n  A giant positive JMR of $\\sim \\SI{825}{\\percent}$ at \\SI{10}{\\kelvin} and $\\sim \\SI{134}{\\percent}$ at room temperature is observed despite the presence of only a single ferromagnetic electrode. Systematic variation of the SiO$_2$ tunnel barrier thickness reveals a reproducible oscillatory sign reversal of the JMR accompanied by a monotonic decay in magnitude. This behavior reflects thickness-dependent modulation of spin-selective tunneling mediated by phase-coherent interfacial carriers and can be described phenomenologically by an RKKY-like functional form without invoking conventional metallic exchange interactions. These results identify Mn$_2$CoAl/native-SiO$_2$/p-Si heterostructures as robust and scalable platforms for room-temperature spin-selective transport, with potential applications in semiconductor-compatible spin filters, magnetic field sensors, and reconfigurable spintronic logic elements.",
    "arxiv_id": "2601.05303",
    "authors": [
      "Nilay Maji",
      "Subham Mohanty",
      "Pujarani Dehuri"
    ],
    "categories": [
      "cond-mat.mes-hall"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "Giant and Oscillatory Junction Magnetoresistance via RKKY-like Spin Coupling in Spin-Gapless Mn$_2$CoAl/SiO$_2$/p-Si Heterostructures",
    "url": "https://arxiv.org/abs/2601.05303",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9f9ee6ae-2bb6-4083-88a7-c864ac17fef3",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}