Journal
NANOSCALE
Volume 7, Issue 33, Pages 13808-13815Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr03231h
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Funding
- U.S. National Science Foundation (Ceramic Program) [DMR-1401266, DMR-0846504]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Laboratory Directed Research and Development Program
- European Research Council [ERC-2009-AdG 247276 NOVOX]
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- Division Of Materials Research [0846504] Funding Source: National Science Foundation
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An exchange bias effect with perpendicular anisotropy is of great interest owing to potential applications such as read heads in magnetic storage devices with high thermal stability and reduced dimensions. Here we report a novel approach for achieving perpendicular exchange bias by orienting the ferromagnetic/antiferromagnetic coupling in the vertical geometry through a unique vertically aligned nanocomposite (VAN) design. Our results demonstrate robust perpendicular exchange bias phenomena in micrometer-thick films employing a prototype material system of antiferromagnetic BiFeO3 and ferromagnetic La0.7Sr0.3MnO3. The unique response of exchange bias to a perpendicular magnetic field reveals the existence of exchange coupling along their vertical heterointerfaces, which exhibits a strong dependence on their strain states. This VAN approach enables a large selection of material systems for achieving perpendicular exchange bias, which could lead to advanced spintronic devices.
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