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Bistable Spin‐Crossover Nanoparticles Showing Magnetic Thermal Hysteresis near Room Temperature
Author(s) -
Coronado E.,
GalánMascarós J. R.,
MonrabalCapilla M.,
GarcíaMartínez J.,
PardoIbáñez P.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200700559
Subject(s) - spin crossover , bistability , thermal hysteresis , nanoparticle , hysteresis , materials science , octane , magnetic nanoparticles , spin (aerodynamics) , condensed matter physics , nanotechnology , optoelectronics , organic chemistry , thermodynamics , phase transition , physics , chemistry
Nanoparticles exhibiting a cooperative spin transition , prepared using the reverse micelle technique, are reported. A 40 K magnetic hysteresis is observed near room temperature for [Fe(Htrz) 2 (trz)](BF 4 ) nanoparticles (where trz is a triazole derivative) of 11 ± 5 nm in diameter. The figure shows the nanoparticles in octane in the low‐spin state (left) and the high‐spin state (right).