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Enhanced Chemical Ordering and Coercivity in FePt Alloy Nanoparticles by Sb‐Doping
Author(s) -
Yan Q.,
Kim T.,
Purkayastha A.,
Ganesan P. G.,
Shima M.,
Ramanath G.
Publication year - 2005
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.200500949
Subject(s) - materials science , coercivity , tetragonal crystal system , annealing (glass) , alloy , nanoparticle , doping , chemical engineering , nanotechnology , crystallography , condensed matter physics , metallurgy , optoelectronics , crystal structure , chemistry , physics , engineering
Sb doping stabilizes the chemically ordered tetragonal L1 0 structure in FePt alloy nanoparticles, yielding higher coercivities ( H c ) at lower annealing temperatures (see Figure) than previously reported. Upon annealing to ∼ 300 °C, nanoparticles yield coercivities more than ten times those previously reported for FePt nanoparticles of similar sizes annealed to the same temperature. These findings are of importance for ultrahigh‐density memory device applications.