Magnetic superlattices and their nanoscale phase transition effects

Jinwoo Cheon; Jong Il Park; Jin Sil Choi; Young Wook Jun; Sehun Kim; Min Gyu Kim; Young Min Kim; Youn Joong Kim

doi:10.1073/pnas.0508877103

Magnetic superlattices and their nanoscale phase transition effects

Jinwoo Cheon, Jong Il Park, Jin Sil Choi, Young Wook Jun, Sehun Kim, Min Gyu Kim, Young Min Kim, Youn Joong Kim

Department of Chemistry

Research output: Contribution to journal › Article

80 Citations (Scopus)

Abstract

The systematic assembly of nanoscale constituents into highly ordered super-lattices 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 ₃O₄ nanoparticles with multidimensional symmetry of either AB (NaCl) or AB₂ (AlB₂). The discovery of significant enhancement (≈25 times) of ferrimagnetism is further revealed by forming previously undescribed superlattices of magnetically soft-hard Fe ₃O₄@CoFe₂O₄ through the confined geometrical effect of thermally driven intrasuperlattice phase transition between the nanoparticulate components.

Original language	English
Pages (from-to)	3023-3027
Number of pages	5
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	103
Issue number	9
DOIs	https://doi.org/10.1073/pnas.0508877103
Publication status	Published - 2006 Feb 28

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Cheon, J., Park, J. I., Choi, J. S., Jun, Y. W., Kim, S., Kim, M. G., Kim, Y. M., & Kim, Y. J. (2006). Magnetic superlattices and their nanoscale phase transition effects. Proceedings of the National Academy of Sciences of the United States of America, 103(9), 3023-3027. https://doi.org/10.1073/pnas.0508877103

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abstract = "The systematic assembly of nanoscale constituents into highly ordered super-lattices 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 3O4 nanoparticles with multidimensional symmetry of either AB (NaCl) or AB2 (AlB2). The discovery of significant enhancement (≈25 times) of ferrimagnetism is further revealed by forming previously undescribed superlattices of magnetically soft-hard Fe 3O4@CoFe2O4 through the confined geometrical effect of thermally driven intrasuperlattice phase transition between the nanoparticulate components.",

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Magnetic superlattices and their nanoscale phase transition effects. / Cheon, Jinwoo; Park, Jong Il; Choi, Jin Sil; Jun, Young Wook; Kim, Sehun; Kim, Min Gyu; Kim, Young Min; Kim, Youn Joong.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 103, No. 9, 28.02.2006, p. 3023-3027.

Research output: Contribution to journal › Article

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10.1073/pnas.0508877103