Bistable Magnetoresistance Switching in Exchange-Coupled CoFe2O4-Fe3O4 Binary Nanocrystal Superlattices by Self-Assembly and Thermal Annealing
- Authors
- Soong Ju Oh
- Issue Date
- 2월-2013
- Publisher
- AMER CHEMICAL SOC
- Keywords
- binary nanocrystal superlattices; BNSLs; self-assembly; exchange coupling; magnetoresistance; magnetic nanocrystal
- Citation
- ACS NANO, v.7, no.2, pp.1478 - 1486
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 7
- Number
- 2
- Start Page
- 1478
- End Page
- 1486
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84521
- DOI
- 10.1021/nn3052617
- ISSN
- 1936-0851
- Abstract
- 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.