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Ferromagnetic resonance of Co thin films grown by atomic layer deposition on the Sb2Te3 topological insulator

Emanuele Longo; Claudia Wiemer; Matteo Belli; Raimondo Cecchini; Massimo Longo; Matteo Cantoni; Christian Rinaldi; Michael D. Overbeek; Charles H. Winter; Gianluca Gubbiotti; Graziella Tallarida; Marco Fanciulli; Roberto Mantovan


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{
  "DOI": "10.1016/j.jmmm.2020.166885", 
  "language": "eng", 
  "title": "Ferromagnetic resonance of Co thin films grown by atomic layer deposition on the Sb2Te3 topological insulator", 
  "issued": {
    "date-parts": [
      [
        2020, 
        4, 
        10
      ]
    ]
  }, 
  "abstract": "<p>Interfacing ferromagnetic materials with topological insulators is an intriguing strategy in order to enhance spin-to-charge conversion mechanisms, paving the way toward highly efficient spin-based electronic devices. In particular, the use of large-scale deposition techniques is demanding for a sustainable and cost-effective industrial technology transfer. In this work, we study the magnetic properties of the Co/Sb<sub>2</sub>Te<sub>3</sub> heterostructure, where the ferromagnetic Co layer is deposited by atomic layer deposition on top of the Sb<sub>2</sub>Te<sub>3</sub> topological insulator, which is grown by metal organic chemical vapor deposition. In particular, broadband ferromagnetic resonance is employed to characterize the Co/Sb<sub>2</sub>Te<sub>3</sub> system and the reference heterostructure Co/Pt. For Co/Sb<sub>2</sub>Te<sub>3</sub>, we extract an effective magnetic anisotropy constant Keff=4.26\u221910<sup>6&nbsp;</sup>erg/cm<sup>3</sup> , which is an order of magnitude higher than in Co/Pt (Keff=0.43\u221910<sup>6&nbsp;</sup>erg/cm<sup>3</sup>). The large difference in the Keff values observed in Co/Sb<sub>2</sub>Te<sub>3</sub> and Co/Pt is explained in terms of the different Co crystalline structures achieved on top of Sb<sub>2</sub>Te<sub>3</sub> and Pt, respectively. Interestingly, the Co/Sb<sub>2</sub>Te<sub>3</sub> system displays a relatively large Gilbert damping constant (&alpha; = 0.095), which we suggest as possibly due to spin pumping from the Co layer into the Sb<sub>2</sub>Te<sub>3</sub> topological insulator.</p>", 
  "author": [
    {
      "family": "Emanuele Longo"
    }, 
    {
      "family": "Claudia Wiemer"
    }, 
    {
      "family": "Matteo Belli"
    }, 
    {
      "family": "Raimondo Cecchini"
    }, 
    {
      "family": "Massimo Longo"
    }, 
    {
      "family": "Matteo Cantoni"
    }, 
    {
      "family": "Christian Rinaldi"
    }, 
    {
      "family": "Michael D. Overbeek"
    }, 
    {
      "family": "Charles H. Winter"
    }, 
    {
      "family": "Gianluca Gubbiotti"
    }, 
    {
      "family": "Graziella Tallarida"
    }, 
    {
      "family": "Marco Fanciulli"
    }, 
    {
      "family": "Roberto Mantovan"
    }
  ], 
  "version": "preprint", 
  "type": "article-journal", 
  "id": "3843443"
}
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