title: Synthesis and magnetic properties of colloidal MnPt3 nanocrystals.
abstract: The colloidal synthesis and magnetic properties of MnPt(3) nanocrystals are reported. The nanocrystal size depended on the Mn reactant used, but the Mn:Pt stoichiometry was always 1:3. As synthesized, the nanocrystals are compositionally disordered with the face-centered cubic (fcc) A1 phase. Annealing at 580 degrees C changed the MnPt(3) crystal structure to the compositionally ordered L1(2) phase (AuCu(3) structure) with higher magnetocrystalline anisotropy. Magnetization measurements showed that the A1 nanocrystals are paramagnetic and the L1(2) MnPt(3) nanocrystals are superparamagnetic.
authors.affiliation: Department of Chemical Engineering, Texas Materials Institute, and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, 78712, USA.
authors.forename: Doh C
authors.initials: DC
authors.lastname: Lee
authors.forename: Ali
authors.initials: A
authors.lastname: Ghezelbash
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Stowell
authors.forename: Brian A
authors.initials: BA
authors.lastname: Korgel