Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 5, Pages 4037-4044Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c00052
Keywords
exchange bias; magnetic nanostructures; anodic aluminum oxide; exchange interactions; blocking temperature
Funding
- U.S. Department of Energy's Office of Basic Energy Science, DMR [DE FG02 87ER-45332]
- NSF [DMR 1804414, 1805585]
- Spanish Grant [AEI-MINECO FIS2016-76058]
- UE FEDER Una manera de hacer Europa
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant [734801]
- Basque Government [PIBA 2018-11, IT1162-19]
- Office of Undergraduate Research at the University of Texas at San Antonio
- College of Science at the University of Texas at San Antonio
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1805585] Funding Source: National Science Foundation
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Sub-100 nm ferromagnetic/antiferromagnetic nano-disks 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.
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