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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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  <identifier identifierType="URL">https://zenodo.org/record/3843443</identifier>
  <creators>
    <creator>
      <creatorName>Emanuele Longo</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
    <creator>
      <creatorName>Claudia Wiemer</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
    <creator>
      <creatorName>Matteo Belli</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
    <creator>
      <creatorName>Raimondo Cecchini</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
    <creator>
      <creatorName>Massimo Longo</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
    <creator>
      <creatorName>Matteo Cantoni</creatorName>
      <affiliation>Dipartimento di Fisica, Politecnico di Milano</affiliation>
    </creator>
    <creator>
      <creatorName>Christian Rinaldi</creatorName>
      <affiliation>Dipartimento di Fisica, Politecnico di Milano</affiliation>
    </creator>
    <creator>
      <creatorName>Michael D. Overbeek</creatorName>
      <affiliation>Winter Laboratory, Wayne State University</affiliation>
    </creator>
    <creator>
      <creatorName>Charles H. Winter</creatorName>
      <affiliation>Winter Laboratory, Wayne State University</affiliation>
    </creator>
    <creator>
      <creatorName>Gianluca Gubbiotti</creatorName>
      <affiliation>CNR-IOM, Sede Secondaria di Perugia, c/o Dipartimento di Fisica e Geologia</affiliation>
    </creator>
    <creator>
      <creatorName>Graziella Tallarida</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
    <creator>
      <creatorName>Marco Fanciulli</creatorName>
      <affiliation>Università degli studi di Milano-Bicocca, Dipartimento di Scienze dei Materiali</affiliation>
    </creator>
    <creator>
      <creatorName>Roberto Mantovan</creatorName>
      <affiliation>CNR-IMM Unit of Agrate Brianza</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Ferromagnetic resonance of Co thin films grown by atomic layer deposition on the Sb2Te3 topological insulator</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2020</publicationYear>
  <subjects>
    <subject>FMR, ALD, topological insulators, spintronics</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2020-04-10</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/3843443</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsSourceOf" resourceTypeGeneral="Text">10.1016/j.jmmm.2020.166885</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1016/j.jmmm.2020.166885</relatedIdentifier>
  </relatedIdentifiers>
  <version>preprint</version>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;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&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; heterostructure, where the ferromagnetic Co layer is deposited by atomic layer deposition on top of the Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; topological insulator, which is grown by metal organic chemical vapor deposition. In particular, broadband ferromagnetic resonance is employed to characterize the Co/Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; system and the reference heterostructure Co/Pt. For Co/Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt;, we extract an effective magnetic anisotropy constant Keff=4.26∙10&lt;sup&gt;6&amp;nbsp;&lt;/sup&gt;erg/cm&lt;sup&gt;3&lt;/sup&gt; , which is an order of magnitude higher than in Co/Pt (Keff=0.43∙10&lt;sup&gt;6&amp;nbsp;&lt;/sup&gt;erg/cm&lt;sup&gt;3&lt;/sup&gt;). The large difference in the Keff values observed in Co/Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; and Co/Pt is explained in terms of the different Co crystalline structures achieved on top of Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; and Pt, respectively. Interestingly, the Co/Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; system displays a relatively large Gilbert damping constant (&amp;alpha; = 0.095), which we suggest as possibly due to spin pumping from the Co layer into the Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;3&lt;/sub&gt; topological insulator.&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/824123/">824123</awardNumber>
      <awardTitle>Skyrmion-Topological insulator and Weyl semimetal technology</awardTitle>
    </fundingReference>
  </fundingReferences>
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