Enhancement of exchange bias and perpendicular magnetic anisotropy in CoO/Co multilayer thin films by tuning the alumina template nanohole size


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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Salaheldeen, Mohamed</dc:creator>
  <dc:creator>Nafady, Ayman</dc:creator>
  <dc:creator>Abu-Dief, Ahmed M.</dc:creator>
  <dc:creator>Díaz Crespo, Rosario</dc:creator>
  <dc:creator>Fernández -García, María Paz</dc:creator>
  <dc:creator>Andrés, Juan Pedro</dc:creator>
  <dc:creator>López Antón, Ricardo</dc:creator>
  <dc:creator>Blanco, Jesús A.</dc:creator>
  <dc:creator>Álvarez-Alonso, Pablo</dc:creator>
  <dc:date>2022-06-16</dc:date>
  <dc:description>The interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and ex-change bias effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to induce perpendicular magnetic anisotropy and exchange bias. 30-nm-thick CoO/Co multilayers were deposited on nanostructured alumina templates with a broad range of pore diameters, 34 nm ≤ Dp ≤ 96 nm, while maintaining the hexagonal lattice parameter at 107 nm. Increase of both the exchange bias field (HEB) and the coercivity (HC) (12 times and 27 times, respectively) was ob-served in the nanostructured films compared to the non-patterned film. The marked dependence of HEB and HC with antidot hole diameters pinpoints to an in-plane to out-of-plane changeover of the magnetic anisotropy at a nanohole diameter of ∼ 75 nm. Micromagnetic simulation shows the existence of antiferromagnetic layers that generate an exceptional magnetic configuration around the holes, named as antivortex-state. This configuration is responsible of inducing extra high-energy superdomain walls for samples with edge-to-edge distance (W) &gt;&gt; 27 nm and high-energy stripe magnetic domains for W &lt; 27 nm, responsible of the perpendicular magnetic signal of the samples.</dc:description>
  <dc:identifier>https://archive.materialscloud.org/record/2022.80</dc:identifier>
  <dc:identifier>doi:10.24435/materialscloud:jg-e7</dc:identifier>
  <dc:identifier>mcid:2022.80</dc:identifier>
  <dc:identifier>oai:materialscloud.org:1351</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Materials Cloud</dc:publisher>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>Creative Commons Attribution Non Commercial Share Alike 4.0 International https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode</dc:rights>
  <dc:subject>Nanostructured thin films</dc:subject>
  <dc:subject>Perpendicular magnetic anisotropy</dc:subject>
  <dc:subject>Exchange bias</dc:subject>
  <dc:title>Enhancement of exchange bias and perpendicular magnetic anisotropy in CoO/Co multilayer thin films by tuning the alumina template nanohole size</dc:title>
  <dc:type>Dataset</dc:type>
</oai_dc:dc>