Magnetic superlattices and their nanoscale phase transition effects
- 21 February 2006
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 103 (9), 3023-3027
- https://doi.org/10.1073/pnas.0508877103
Abstract
The systematic assembly of nanoscale constituents into highly ordered superlattices is of significant interest because of the potential of their multifunctionalities and the discovery of new collective properties. However, successful observations of such superlattice-associated nanoscale phenomena are still elusive. Here, we present magnetic superlattices of Co and Fe(3)O(4) nanoparticles with multidimensional symmetry of either AB (NaCl) or AB(2) (AlB(2)). The discovery of significant enhancement (approximately 25 times) of ferrimagnetism is further revealed by forming previously undescribed superlattices of magnetically soft-hard Fe(3)O(4)@CoFe(2)O(4) through the confined geometrical effect of thermally driven intrasuperlattice phase transition between the nanoparticulate components.Keywords
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