Evidence of a glassy magnetic transition driven by structural disorder in BiFeO3 nanoparticles

Important effects appear in low and high temperature magnetometry of multiferroic BiFeO3 (BFO) nanoparticles as sizes are reduced from 105 nm to 18 nm. In these particles, a magnetic transition appears close to 200 K probably associated with a spin reorientation which is absent in bigger particles....

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2022-09, Vol.563
Main Authors: Cardona Rodríguez, Alexander, Reiber, Andreas, Schuller, Ivan K., Muraca, Diego, Gabriel Ramírez, Juan
Format: Article
Language:English
Subjects:
Atomic vibrations instabilities
BiFeO3 nanoparticles
Magnetic transition
MATERIALS SCIENCE
Structural disorder
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Summary:Important effects appear in low and high temperature magnetometry of multiferroic BiFeO3 (BFO) nanoparticles as sizes are reduced from 105 nm to 18 nm. In these particles, a magnetic transition appears close to 200 K probably associated with a spin reorientation which is absent in bigger particles. At higher temperatures and up to the bulk ferroelectric Curie temperature (1000 K), two additional magnetic transitions can be identified. Around TN 600 K, a size-dependent magnetic transition appears, associated with an antiferromagnetic transition. A model based on atomic vibration instability can describe the variation of TN with nanoparticle size. Furthermore, for certain sizes, the properties are dominated by the glassy state arising from the disorder produced by the formation of a core-shell structure. This implies that the magnetic behavior of nanoparticles is strongly affected by their crystal structure close to the transition temperature. Finally, the structural disorder which couples to the magnetic properties add control to the magnetic and ferroelectric properties of BFO nanoparticles.
ISSN:0304-8853