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Synthesis and Size-Dependent Exchange Bias in Inverted Core−Shell MnO|Mn3O4 Nanoparticles
Abstract
Core-shell nanoparticles of MnO|Mn3O4 with average particle sizes of 5-60 nm, composed of an antiferromagnetic (AFM) core and a ferrimagnetic (FiM) shell, have been synthesized and their magnetic properties investigated. The core-shell structure has been generated by the passivation of the MnO cores, yielding an inverted AFM-core|FiM-shell system, as opposed to the typical FM-core|AFM-shell. The exchange-coupling between AFM and FiM gives rise to an enhanced coercivity of approximately 8 kOe and a loop shift of approximately 2 kOe at 10 K, i.e., exchange bias. The coercivity and loop shift show a non-monotonic variation with the core diameter. The large coercivity and the loop shift are ascribed to the highly anisotropic Mn3O4 and size effects of the AFM (i.e., uncompensated spins, AFM domains, and size-dependent transition temperature).
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Cites
Ultra-large-scale syntheses of monodisperse nanocrystals
Park, J., An, K., Hwang, Y., Park, J.-G., Noh, H.-J., Kim, J.-Y., Park, J.-H., Hwang, N.-M., & Hyeon, T. (2004) · Nature Materials · doi:10.1038/nmat1251 · Cited by 4,076
Peng, X., Wickham, J., & Alivisatos, A. P. (1998) · Journal of the American Chemical Society · doi:10.1021/ja9805425 · Cited by 1,895
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Carbone, L., & Cozzoli, P. D. (2010) · Nano Today · doi:10.1016/j.nantod.2010.08.006 · Cited by 691
Organic Phase Syntheses of Magnetic Nanoparticles and Their Applications
Wu, L., Mendoza-Garcia, A., Li, Q., & Sun, S. (2016) · Chemical Reviews · doi:10.1021/acs.chemrev.5b00687 · Cited by 601
The Heat-Up Synthesis of Colloidal Nanocrystals
van Embden, J., Chesman, A. S. R., & Jasieniak, J. J. (2015) · Chemistry of Materials · doi:10.1021/cm5028964 · Cited by 414
Controlling exchange bias in Fe3O4/FeO composite particles prepared by pulsed laser irradiation
Swiatkowska-Warkocka, Z., Kawaguchi, K., Wang, H., Katou, Y., & Koshizaki, N. (2011) · Nanoscale Research Letters · doi:10.1186/1556-276x-6-226 · Cited by 71
Metadata
- Authors
- Salazar-Alvarez, G., Sort, J., Suriñach, S., Baró, M. D., & Nogués, J.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-06-27
- Volume
- 129
- Issue
- 29
- Pages
- 9102-9108
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2019407039
- Cited by
- 285
- References
- 2
- FWCI
- 9.69
- Type
- journal article
- Language
- en
- Open access
- closed
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