UF_3010_jandrew.pptx

et al science 15 391 2005 andrew research group

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Multiferroics ferroelectrics ferroelastics ferromagnets •  Multiferroic materials exhibit at least two types of ferroic ordering •  The interaction between the two types of ordering leads to additional interactions •  Magnetoelectric effect Spaldin, N., et al., Science 15, 391, 2005. Andrew Research Group - University of Florida Background: Multiferroic Motivations •  No material exists that has high permeability (µ) and high permittivity (ε) •  Possible applications include electromagnetic interference (EMI) filters, two-state memory devices, and biomedical •  To study the size effects of these properties, through synthesis of nanoparticles Andrew Research Group - University of Florida Magnetism •  Ferromagnetic materials have a permanent magnetization (e.g. Co, Fe, Ni) •  Antiferromagnetic and ferrimagnetic (e.g. Ferrites: MFe2O4, M=Fe, Ni, Zn, Co, Mn) materials moment align antiparallel Andrew Research Group - University of Florida Ferroelectricity •  Ferroelectric materials have a permanent dipole, and their dipole moment is not necessarily zero in the absence of an electric field •  Requires a noncentrosymmetric crystal structure –  Tetragonal Perovskite (P4mm) (BaTiO3) Andrew Research Group - University of Florida Single Phase Multiferroics •  Materials that exhibit both ferroelectric and ferromagnetic behavior in the same phase. •  Why are they uncommon? –  d electrons •  BiMnO3 is the only one with ferromagnetic ordering •  BiFeO3 is the only one with both Tc,FE and TN,AFM above room temperature Andrew Research Group - University of Florida Multiphase Multiferroics •  Motivations: –  No single-phase material exists that has high permeability (µ) and high permittivity (ε) –  To study the size effects of these properties, through synthesis of nanoparticles –  To implement nanoparticles into real engineering devices •  Multiphase multiferroics –  Multilayer structures –  Interfacial coupling •  Benefits of nanoparticles Andrew Research Group - University of...
View Full Document

This note was uploaded on 01/16/2014 for the course EMA 3010 taught by Professor Unknown during the Fall '08 term at University of Florida.

Ask a homework question - tutors are online