Journal
ACS NANO
Volume 7, Issue 2, Pages 1478-1486Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn3052617
Keywords
binary nanocrystal superlattices; BNSLs; self-assembly; exchange coupling; magnetoresistance; magnetic nanocrystal
Categories
Funding
- DOE Office of ARPA-E [DE-AR0000123]
- MRSEC program of the National Science Foundation [DMR 11-20901]
- Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) on Optical Metamaterials [N00014-10-1-0942]
- U.S. Department of Energy Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
- Richard Perry University Professorship
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Self-assembly of multicomponent nanocrystal superlattices provides a modular approach to the design of metamaterials by choosing constituent nanocrystal building blocks with desired physical properties and engineering the interparticle coupling. In this work, we report the self-assembly of binary nanocrystal superlattices composed of magnetically hard CoFe2O4 nanocrystals and magnetically soft Fe3O4 nanocrystals. Both NaZn13- and MgZn2-type CoFe2O4-Fe3O4 binary nanocrystal superlattices have been formed by the liquid-air interfacial assembly approach. Exchange coupling is achieved in both types of binary superlattices after thermal annealing under vacuum at 400 degrees C. The exchange-coupled CoFe2O4-Fe3O4 binary nanocrystal superlattices show single-phase magnetization switching behavior and magnetoresistance switching behavior below 200 K. The NaZn13-type CoFe2O4-Fe3O4 binary nanocrystal superlattices annealed at 500 degrees C even exhibit bistable magnetoresistance switching behavior at room temperature constituting a simple nonvolatile memory function.
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