Size-dependent magnetic properties of single-crystalline multiferroic BiFeO3 nanoparticles.
As-prepared, single-crystalline bismuth ferrite nanoparticles show strong size-dependent magnetic properties that correlate with: (a) increased suppression of the known spiral spin structure (period length of approximately 62 nm) with decreasing nanoparticle size and (b) uncompensated spins and strain anisotropies at the surface. Zero-field-cooled and field-cooled magnetization curves exhibit spin-glass freezing behavior due to a complex interplay between finite size effects, interparticle interactions, and a random distribution of anisotropy axes in our nanoparticle assemblies.
Park
Tae-Jin
TJ
Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA.
Papaefthymiou
Georgia C
GC
Viescas
Arthur J
AJ
Moodenbaugh
Arnold R
AR
Wong
Stanislaus S
SS