Journal
NANOSCALE
Volume 5, Issue 10, Pages 4449-4453Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr00104k
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Funding
- National Science Council of Republic of China [NSC-101-2119-M-009-003-MY2]
- Ministry of Education [MOE-ATU 101W961]
- Center for Interdisciplinary Science at National Chiao Tung University
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In the past decade, self-assembled vertical nano-heterostructures have drawn considerable attention because a high interface-to-volume ratio can be used to tailor or create functionalities. We have systematically investigated the magnetic properties of oxide heterostructures consisting of the CoFe2O4 nanopillars embedded in the BiFeO3 matrix using macroscopic magnetization measurements and element-selective soft X-ray absorption magnetic circular dichroism (XMCD) at the Co- and Fe-L-2,L-3 edge. The magnetization and XMCD data show that the total ordered magnetic moment of Co2+ in CoFe2O4-BiFeO3 nano-heterostructures is strongly enhanced. This study clearly indicates that the high interface-to-volume ratio vertical nanostructure creates a strong ferromagnetic and antiferromagnetic magnetic coupling via an interface. Furthermore, the magnetic coupling can be tuned in the multiferroic-ferrimagnetic self-assembled heterostructures by controlling the spacing between nanopillars.
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