Ferroic engineering of atomic layers to create a room-temperature multiferroic

Speaker: 
Julia Mundy
Event Date and Time: 
Fri, 2016-04-22 11:00 - 12:30
Location: 
Hennings 318
Local Contact: 
Leanne Ebbs / Doug Bonn
Transition metal oxides exhibit almost every physical state known including metallic conductivity, (high-temperature) superconductivity, colossal magnetoresistance, photoconductivity, ferroelectricity, and ferromagnetism. Moreover, the interface between two transition metal oxides is a further playground: the interplay of the lattice, charge, spin and orbital degrees of freedom inherent at these heterointerfaces can stabilize phases that deviate significantly from those of the parent compounds. With the ability to independently tune the local environment of each species, molecular-beam epitaxy is a powerful tool to construct these transition metal oxides thin films and heterostructures, atom-by-atom. Here I will show we can use this advanced deposition technique to engineer new materials including a magnetoelectric multiferroic superlattice where ferroelectricity enhances magnetism at all relevant length scales. Starting with a single layer of a ferrimagnet with magnetic spin frustration, we impose sub-Angstrom ferroelectric rumpling to lower the spin frustration and boost the magnetic transition to above room-temperature. We then further engineer the ferroelectric domain architecture to move charge through the system to boost the magnetic moment. Our results demonstrate a design methodology for creating higher-temperature multiferroics by exploiting a combination of geometric frustration, polarization doping and epitaxial engineering.
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