Open AccessMagnetic superlattices and their nanoscale phase transition effects
Author(s) -
Jinwoo Cheon,
JongIl Park,
Jinsil Choi,
Youngwook Jun,
Se Hoon Kim,
Min Gyu Kim,
YoungMin Kim,
Youn Joong Kim
Publication year - 2006
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.0508877103
Subject(s) - superlattice , ferrimagnetism , nanoscopic scale , condensed matter physics , materials science , phase transition , nanoparticle , phase (matter) , nanotechnology , chemical physics , chemistry , physics , magnetization , magnetic field , organic chemistry , quantum mechanics
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.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom