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Effect of flattened surface morphology of anodized aluminum oxide templates on the magnetic properties of nanoporous Co/Pt and Co/Pd thin multilayered films
KTH, School of Engineering Sciences (SCI), Applied Physics, Material Physics, MF. Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Viet Nam Department of Physics, University of Gothenburg, Gothenburg, 41296, Sweden.
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2018 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 427, 649-655 p.Article in journal (Refereed) Published
Abstract [en]

For the first time, nanoporous Al2O3 templates with smoothed surface relief characterized by flattened interpore areas were used in the fabrication of Co/Pd and Co/Pt multilayers (MLs) with strong perpendicular magnetic anisotropy (PMA). Alternating gradient magnetometry (AGM) revealed perfectly conserved PMA in the Co/Pd and Co/Pt porous MLs (antidot arrays) with a ratio of remanent magnetization (Mr) to saturation magnetization (MS) of about 0.99, anisotropy fields (Ha) of up to 2.6 kOe, and a small deviation angle of 8° between the easy magnetization axis and the normal to the film surface. The sufficient magnetic hardening of the porous MLs with enhanced coercive field HC of up to ∼1.9 kOe for Co/Pd and ∼1.5 kOe for Co/Pt MLs, as compared to the continuous reference samples (∼1.5–2 times), is associated with the pinning of the magnetic moments on the nanopore edges. Application of the Stoner–Wohlfarth model for fitting the experimental M/MS(H) curves yielded clear evidence of the predominantly coherent rotation mechanism of magnetization reversal in the porous films.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 427, 649-655 p.
Keyword [en]
Antidots, Co/Pd multilayers, Co/Pt multilayers, Percolated perpendicular media, Perpendicular magnetic anisotropy, Porous anodic aluminum oxide templates, Aluminum, Anisotropy, Anodic oxidation, Curve fitting, Magnetic anisotropy, Magnetic moments, Magnetic multilayers, Magnetism, Magnetization, Magnetization reversal, Multilayers, Oxide films, Oxides, Saturation magnetization, Co/Pt multilayer, Perpendicular media, Cobalt
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-216812DOI: 10.1016/j.apsusc.2017.08.238ISI: 000415219100083Scopus ID: 2-s2.0-85029377937OAI: oai:DiVA.org:kth-216812DiVA: diva2:1162782
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20171207

Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2017-12-07Bibliographically approved

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Åkerman, Johan

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