Journal article Open Access

Ion irradiation-induced easy-cone anisotropy in double-MgO free layers for perpendicular magnetic tunnel junctions

B. M. S. Teixeira; A. A. Timopheev; N. F. F. Caçoilo; S. Auffret; R. C. Sousa; B. Dieny; E. Alves; N. A. Sobolev


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  <identifier identifierType="DOI">10.5281/zenodo.3674060</identifier>
  <creators>
    <creator>
      <creatorName>B. M. S. Teixeira</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-9317-5322</nameIdentifier>
      <affiliation>Physics Department and i3N, University of Aveiro, 3810-193 Aveiro, Portugal</affiliation>
    </creator>
    <creator>
      <creatorName>A. A. Timopheev</creatorName>
      <affiliation>Université Grenoble Alpes, CEA, CNRS, Grenoble INP, INAC, SPINTEC, F-38000 Grenoble, France</affiliation>
    </creator>
    <creator>
      <creatorName>N. F. F. Caçoilo</creatorName>
      <affiliation>Physics Department and i3N, University of Aveiro, 3810-193 Aveiro, Portugal</affiliation>
    </creator>
    <creator>
      <creatorName>S. Auffret</creatorName>
      <affiliation>Université Grenoble Alpes, CEA, CNRS, Grenoble INP, INAC, SPINTEC, F-38000 Grenoble, France</affiliation>
    </creator>
    <creator>
      <creatorName>R. C. Sousa</creatorName>
      <affiliation>Université Grenoble Alpes, CEA, CNRS, Grenoble INP, INAC, SPINTEC, F-38000 Grenoble, France</affiliation>
    </creator>
    <creator>
      <creatorName>B. Dieny</creatorName>
      <affiliation>Université Grenoble Alpes, CEA, CNRS, Grenoble INP, INAC, SPINTEC, F-38000 Grenoble, France</affiliation>
    </creator>
    <creator>
      <creatorName>E. Alves</creatorName>
      <affiliation>IPFN, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal</affiliation>
    </creator>
    <creator>
      <creatorName>N. A. Sobolev</creatorName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-9420-8130</nameIdentifier>
      <affiliation>Physics Department and i3N, University of Aveiro, 3810-193 Aveiro, Portugal &amp; National University of Science and Technology "MISiS," 119049 Moscow, Russia</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Ion irradiation-induced easy-cone anisotropy in double-MgO free layers for perpendicular magnetic tunnel junctions</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2018</publicationYear>
  <dates>
    <date dateType="Issued">2018-05-15</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/3674060</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsPreviousVersionOf" resourceTypeGeneral="Text">10.1063/1.5026854</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.3674059</relatedIdentifier>
  </relatedIdentifiers>
  <version>Author Accepted Manuscript</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;We have used the ferromagnetic resonance in the X-band (9.37&amp;thinsp;GHz) to investigate the effect of 400&amp;thinsp;keV Ar&lt;sup&gt;+&lt;/sup&gt; irradiation on the perpendicular magnetic anisotropy (PMA) and Gilbert damping parameter, &amp;alpha;, of double-MgO free layers designed for application in perpendicular magnetic tunnel junctions. The samples comprised a MgO/Fe&lt;sub&gt;72&lt;/sub&gt;Co&lt;sub&gt;8&lt;/sub&gt;B&lt;sub&gt;20&lt;/sub&gt;/X(0.2&amp;thinsp;nm)/Fe&lt;sub&gt;72&lt;/sub&gt;Co&lt;sub&gt;8&lt;/sub&gt;B&lt;sub&gt;20&lt;/sub&gt;/MgO layer stack, where X stands for an ultrathin Ta or W spacer. Samples with two different total FeCoB layer thicknesses, t&lt;sub&gt;FCB&lt;/sub&gt;&amp;thinsp;=&amp;amp;thinsp;3.0&amp;thinsp;nm and t&lt;sub&gt;FCB&lt;/sub&gt;&amp;thinsp;=&amp;amp;thinsp;2.6&amp;thinsp;nm, were irradiated with ion fluences ranging from 10&lt;sup&gt;12&lt;/sup&gt;&amp;thinsp;cm&lt;sup&gt;&amp;minus;2&lt;/sup&gt; to 10&lt;sup&gt;16&lt;/sup&gt;&amp;thinsp;cm&lt;sup&gt;&amp;minus;2&lt;/sup&gt;. The effective first-order PMA field, B&lt;sub&gt;K1&lt;/sub&gt;, decreased nearly linearly with the logarithm of the fluence for both FeCoB thicknesses and spacer elements. The decrease in B&lt;sub&gt;K1&lt;/sub&gt;, which is likely caused by an ion-induced intermixing at the FeCoB/MgO interfaces, resulted in a reorientation of the magnetization of the free layers with t&lt;sub&gt;FCB&lt;/sub&gt;&amp;thinsp;=&amp;amp;thinsp;2.6&amp;thinsp;nm, initially exhibiting a perpendicular easy-axis anisotropy. For intermediate fluences, 10&lt;sup&gt;13&lt;/sup&gt;&amp;thinsp;cm&lt;sup&gt;&amp;minus;2&lt;/sup&gt; and 10&lt;sup&gt;14&lt;/sup&gt;&amp;thinsp;cm&lt;sup&gt;&amp;minus;2&lt;/sup&gt;, easy-cone states with different cone angles could be induced in the free layer with a W spacer. Importantly, no corresponding increase in the Gilbert damping was observed. This study shows that ion irradiation can be used to tune the easy-cone anisotropy in perpendicular magnetic tunnel junctions, which is interesting for spintronic applications such as spin-torque magnetic memory devices, oscillators, and sensors.&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/H2020/778308/">778308</awardNumber>
      <awardTitle>Physical principles of the creation of novel SPINtronic materials on the base of MULTIlayered metal-oxide FILMs for magnetic sensors and MRAM</awardTitle>
    </fundingReference>
  </fundingReferences>
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