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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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    "language": "eng", 
    "title": "Ferromagnetic resonance of Co thin films grown by atomic layer deposition on the Sb2Te3 topological insulator", 
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        "title": "Skyrmion-Topological insulator and Weyl semimetal technology", 
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    "keywords": [
      "FMR, ALD, topological insulators, spintronics"
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    "publication_date": "2020-04-10", 
    "creators": [
      {
        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Emanuele Longo"
      }, 
      {
        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Claudia Wiemer"
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      {
        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Matteo Belli"
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        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Raimondo Cecchini"
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      {
        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Massimo Longo"
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        "affiliation": "Dipartimento di Fisica, Politecnico di Milano", 
        "name": "Matteo Cantoni"
      }, 
      {
        "affiliation": "Dipartimento di Fisica, Politecnico di Milano", 
        "name": "Christian Rinaldi"
      }, 
      {
        "affiliation": "Winter Laboratory, Wayne State University", 
        "name": "Michael D. Overbeek"
      }, 
      {
        "affiliation": "Winter Laboratory, Wayne State University", 
        "name": "Charles H. Winter"
      }, 
      {
        "affiliation": "CNR-IOM, Sede Secondaria di Perugia, c/o Dipartimento di Fisica e Geologia", 
        "name": "Gianluca Gubbiotti"
      }, 
      {
        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Graziella Tallarida"
      }, 
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        "affiliation": "Universit\u00e0 degli studi di Milano-Bicocca, Dipartimento di Scienze dei Materiali", 
        "name": "Marco Fanciulli"
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        "affiliation": "CNR-IMM Unit of Agrate Brianza", 
        "name": "Roberto Mantovan"
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    "description": "<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>"
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