Abstract
A Strain-related defects, such as dislocations, and their effects on physical properties are well known for metallic materials as well as for oxide thin films. However, little to no research regards these effects on oxide nanoparticles. Herein, we deeply explore the effects of dislocations on the magnetic properties of high-strained BiFeO3 nanoparticles obtained by high-energy cryo-milling. Several structural changes such as superexchange angle, Fe-O-Fe bond length and FeO6 octahedral distortions are confirmed. Besides, the introduction of high dislocation density and reduced crystallite size gives rise to an unusual magnetic behavior changing the magnetic hysteresis from an antiferromagnetic-like to a weak-ferromagnetic-like loop, suggesting that high concentration of dislocations in BiFeO3 nanoparticles can be used to directly control its magnetic properties.
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