Ultradense Arrays of Sub-100 nm Co/CoO Nanodisks for Spintronics Applications

Sub-100 nm ferromagnetic/antiferromagnetic nanodisks present enhanced magnetic properties with respect to their thin film counterparts. Co/CoO disks were fabricated over large areas by a transferring process of an anodic aluminum oxide membrane, electron beam evaporation of Co, and subsequent oxidat...

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Bibliographic Details
Published in:ACS applied nano materials 2020-05, Vol.3 (5), p.4037-4044
Main Authors: Morales, R, Flores, A. N, Vargas, Nicolas M, Giuliani, J, Schuller, Ivan K, Monton, C
Format: Article
Language:English
Subjects:
anodic aluminum oxide
blocking temperature
exchange bias
exchange interactions
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
layers
magnetic nanostructures
magnetic properties
materials science
nanostructures
oxidation
thin films
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Summary:Sub-100 nm ferromagnetic/antiferromagnetic nanodisks present enhanced magnetic properties with respect to their thin film counterparts. Co/CoO disks were fabricated over large areas by a transferring process of an anodic aluminum oxide membrane, electron beam evaporation of Co, and subsequent oxidation to CoO. This method reveals exchange bias fields up to 4 times larger than that in thin films and higher blocking temperatures for the same oxidation protocol. The significant improvement of the magnetic properties is attributed to finite-size effects in nanostructures and might be exploited in diverse areas such as the magnetic stabilization of ultradense arrays or the scalability process of patterned heterostructures in spintronic phenomena.
ISSN:2574-0970
2574-0970
DOI:10.1021/acsanm.0c00052