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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

Journal article
Authors Thoai N. Anh Nguyen
J. Fedotova
J. Kasiuk
V. Bayev
O. Kupreeva
S. Lazarouk
D. H. Manh
D. L. Vu
Sunjae Chung
Johan Åkerman
V. Altynov
A. Maximenko
Published in Applied Surface Science
Volume 427
Pages 649-655
ISSN 0169-4332
Publication year 2018
Published at Department of Physics (GU)
Pages 649-655
Language en
Links https://doi.org/10.1016/j.apsusc.20...
Keywords 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
Subject categories Physical Sciences

Abstract

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. © 2017 Elsevier B.V.

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