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As described in the Science paper, Maksymovych and his colleagues showed that the local conductance can be controlled by switching this ferroelectric polarization. The polarization provides two memory states, and the conductance provides the way to read this memory.
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Recent work by Petro Maksymovych and his colleagues at the Center for Nanophase Materials Sciences on ferroelectric oxides that has led to the discovery that polarization switching in 30-50 nm oxide films of lead-zirconate and bismuth ferrite can abruptly change their local electrical conductivity by as much as 50,000%. Polarization-dependent electron tunneling was first hypothesized by Leo Esaki almost 30 years ago, but has so far been elusive due to the dominance of extrinsic conductance mechanisms in complex oxides such as oxygen vacancy diffusion and formation of localized conductive filaments. Using a unique scanning force microscope developed at the CNMS, the researchers investigated the nanoscale conductivity of epitaxially grown perovskite ferroelectrics.
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The national lab setting versus academia - “I like it. It’s different, it has its pros and cons. There is much less manpower, but at the same time research is in some ways more professional, if I may put it like that. You work with people who are way past their degree training, and so they typically know quite a lot about what they’re doing now, on the very deep expert level. So you can learn from that a lot. And the challenge, actually, is to offer something back that would be rated by these people as something interesting. And that’s good; it keeps you fresh and alive.”
– Peter Maksymovych
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