Magnetic superlattices and their nanoscale phase transition effects.
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.
Cheon
Jinwoo
J
Department of Chemistry and Nano-Medical National Core Research Center, Yonsei University, Seoul, Korea. jcheon@yonsei.ac.kr
Park
Jong-Il
JI
Choi
Jin-sil
JS
Jun
Young-wook
YW
Kim
Sehun
S
Kim
Min Gyu
MG
Kim
Young-Min
YM
Kim
Youn Joong
YJ