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


JSON Export

{
  "revision": 17, 
  "metadata": {
    "publication_date": "Jun 16, 2022, 21:27:07", 
    "_oai": {
      "id": "oai:materialscloud.org:1351"
    }, 
    "license": "Creative Commons Attribution Non Commercial Share Alike 4.0 International", 
    "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 \u2264 Dp \u2264 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 \u223c 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) >> 27 nm and high-energy stripe magnetic domains for W < 27 nm, responsible of the perpendicular magnetic signal of the samples.", 
    "contributors": [
      {
        "familyname": "Salaheldeen", 
        "affiliations": [
          "Departamento de F\u00edsica Aplicada, EIG, Universidad del Pa\u00eds Vasco, UPV/EHU, 20018, San Sebasti\u00e1n, Spain."
        ], 
        "givennames": "Mohamed"
      }, 
      {
        "familyname": "Nafady", 
        "affiliations": [
          "Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia"
        ], 
        "givennames": "Ayman"
      }, 
      {
        "familyname": "Abu-Dief", 
        "affiliations": [
          "Chemistry Department, Faculty of Science, Sohag University, 82524, Sohag, Egypt"
        ], 
        "givennames": "Ahmed M."
      }, 
      {
        "familyname": "D\u00edaz Crespo", 
        "affiliations": [
          "Departamento de F\u00edsica, Universidad de Oviedo, C/ Federico Garc\u00eda Lorca 18, 33007 Oviedo, Asturias, Spain."
        ], 
        "givennames": "Rosario"
      }, 
      {
        "familyname": "Fern\u00e1ndez -Garc\u00eda", 
        "affiliations": [
          "Departamento de F\u00edsica, Universidad de Oviedo, C/ Federico Garc\u00eda Lorca 18, 33007 Oviedo, Asturias, Spain."
        ], 
        "givennames": "Mar\u00eda Paz"
      }, 
      {
        "familyname": "Andr\u00e9s", 
        "affiliations": [
          "Instituto Regional de Investigaci\u00f3n Cient\u00edfica Aplicada (IRICA), Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain."
        ], 
        "givennames": "Juan Pedro"
      }, 
      {
        "familyname": "L\u00f3pez Ant\u00f3n", 
        "affiliations": [
          "Instituto Regional de Investigaci\u00f3n Cient\u00edfica Aplicada (IRICA), Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain."
        ], 
        "givennames": "Ricardo"
      }, 
      {
        "familyname": "Blanco", 
        "affiliations": [
          "Departamento de F\u00edsica, Universidad de Oviedo, C/ Federico Garc\u00eda Lorca 18, 33007 Oviedo, Asturias, Spain."
        ], 
        "givennames": "Jes\u00fas A."
      }, 
      {
        "familyname": "\u00c1lvarez-Alonso", 
        "affiliations": [
          "Departamento de F\u00edsica, Universidad de Oviedo, C/ Federico Garc\u00eda Lorca 18, 33007 Oviedo, Asturias, Spain."
        ], 
        "email": "alvarezapablo@uniovi.es", 
        "givennames": "Pablo"
      }
    ], 
    "edited_by": 576, 
    "title": "Enhancement of exchange bias and perpendicular magnetic anisotropy in CoO/Co multilayer thin films by tuning the alumina template nanohole size", 
    "conceptrecid": "1350", 
    "license_addendum": null, 
    "doi": "10.24435/materialscloud:jg-e7", 
    "mcid": "2022.80", 
    "_files": [
      {
        "size": 15522, 
        "key": "Fig2.dat", 
        "checksum": "md5:4df33144a5bd1c7b209e7a8e0526d0d3", 
        "description": "X-ray reflectivity experimental data (open circles) and simulation (red line) of the Glass/Pd/[CoO/Co]x7/Pd ML. Plain text"
      }, 
      {
        "size": 212961, 
        "key": "Fig3a).dat", 
        "checksum": "md5:f9b63b3ce599e55b4931909ab5fcdf7d", 
        "description": "In-plane MOKE hysteresis loops for the non-patterned and antidot CoO/Co ML samples with different hole diameters at room temperature. Plain text"
      }, 
      {
        "size": 116342, 
        "key": "Fig3b).dat", 
        "checksum": "md5:b44475c51b23b8e54dd1800970b6d7ca", 
        "description": "Out-of-the-plane MOKE hysteresis loops for the non-patterned and antidot CoO/Co ML samples with different hole diameters at room temperature. Plain text"
      }, 
      {
        "size": 128, 
        "key": "Fig4.dat", 
        "checksum": "md5:3b2a598106c8ebc3ad0c15890c9af238", 
        "description": "Room temperature coercivity measured along the out-of-the plane and in-plane directions for the antidot CoO/Co ML as a function of antidot hole diameter. Plain text"
      }, 
      {
        "size": 41423, 
        "key": "Fig5-INP.dat", 
        "checksum": "md5:5f3ebf0af7db67f25d3a80776db8b55d", 
        "description": "In-plane of M(H) curves measured at 60 K after field cooling (Hcool = 20 kOe) for the CoO/Co MLs with different hole diameters. Plain text"
      }, 
      {
        "size": 50870, 
        "key": "Fig5-OOP.dat", 
        "checksum": "md5:29ec0bc9ed429fc99a6e5a31f87edd81", 
        "description": "Out-of-the-plane of M(H) curves measured at 60 K after field cooling (Hcool = 20 kOe) for the CoO/Co MLs with different hole diameters. Plain text"
      }, 
      {
        "size": 531305, 
        "key": "figure9.png", 
        "checksum": "md5:c475d0e93866232594072492c628d935", 
        "description": "Micromagnetic simulation of the OOP magnetic domain structure of Co1, CoO1, Co2, and CoO2 nanostructured layers with W = 76 nm and fixed lattice parameter P = 108 nm at the remanence state. PNG format."
      }, 
      {
        "size": 419984, 
        "key": "figure11.png", 
        "checksum": "md5:0903292c6ff3a46854dae2ed931cfc2f", 
        "description": "Micromagnetic simulation of the OOP magnetic domain structure of Co1, CoO1, Co2, and CoO2 nanostructured layers with W = 14 nm and fixed lattice parameter P = 108 nm at the remanence state. PNG format."
      }
    ], 
    "id": "1351", 
    "keywords": [
      "Nanostructured thin films", 
      "Perpendicular magnetic anisotropy", 
      "Exchange bias"
    ], 
    "is_last": true, 
    "status": "published", 
    "references": [
      {
        "comment": "Paper in which the data is discussed", 
        "type": "Journal reference", 
        "citation": "Mohamed Salaheldeen, Ayman Nafady, Ahmed M. Abu-Dief, Rosario D\u00edaz Crespo, Mar\u00eda Paz Fern\u00e1ndez-Garc\u00eda, Juan Pedro Andr\u00e9s, Ricardo L\u00f3pez Ant\u00f3n, Jes\u00fas A. Blanco, Pablo \u00c1lvarez-Alonso. Submitted to Nanomaterials"
      }
    ], 
    "version": 1, 
    "owner": 763
  }, 
  "id": "1351", 
  "created": "2022-05-19T16:34:04.046775+00:00", 
  "updated": "2022-06-16T19:27:07.973711+00:00"
}