Abstracts Book - IMRC 2018

• SF1-O005 Invited Talk
SIZE-INDUCED MULTIFERROICITY IN OXIDE NANOPARTICLES
Juan Gabriel Ramirez Rojas 1 , Jackeline Narvaez Morales 1 , Diego Carranza 1 , Alexander Cardona 1 ,
Oscar Moscoso 2 , Diego Muraca 2 , Andreas Reiber 3 , Marcelo Knobel 2
1 Universidad de los Andes, Department of Physics, Colombia. 2 Universidade Estadual de
Campinas, Instituto de Física Gleb Wataghin, Brazil. 3 Universidad de los Andes, Department of
Chemistry, Colombia.
It is known that new functionalities can emerge in materials when its physical
dimensions are constrained. It has been reported that in thin films, the
ferroelectric response of materials can be drastically enhanced via strain effects.
Then, a natural approach is to reduce the dimensions even more, in the form of
nanoparticles. Here I will report on novel properties that emerge when a
canonical ferroelectric material, like Barium Titanate, BaTiO 3 (BTO) or BiFeO 3
(BFO) is synthetized in the form of NPs. We used a combination of different
chemical methods for the fabrication and obtained NPs with different average
sizes few nanometers to 400 nm. Our magnetometry results indicate that novel
magnetic properties can emerge by tuning the particle size, and furthermore,
that it is possible to couple them with their intrinsic ferroelectric properties. Our
results shows new pathways to achieve multiferroicity in oxide nanoparticles.
Acknowledgment:
Work supported by FAPA program through Facultad de Ciencias and
Vicerrectoria de Investigaciones of Universidad de los Andes, Bogotá Colombia
and Colciencias #120471250659 and #120424054303 and Monterrey-Uniandes.
Keywords: Oxide nanoparticles, Multiferroicity, Ferroelectricity
Presenting authors email: jgramirez@uniandes.edu.co