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Nanoferronics: Creating New Functionality Using Coupling Between Charge and Spin Orders

Nanoferronics: Creating New Functionality Using Coupling Between Charge and Spin Orders

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When Dec 11, 2013
from 02:00 pm to 03:30 pm
Speaker Qi Li
Speaker Information Department of Physics, Pennsylvania State University, University Park 16802
Where 1311 HN
Contact Name Yuhang Ren
Contact Email
Contact Phone 212-772-5258
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Abstract

Nanoferronics is a new device concept which mainly refers to combining ferroelectric based device with spintronics to realize new functionalities, such as electric control of spins and multifunctional devices.  It is proposed as one of the alternatives to the semiconductor electronics which is facing increasing challenges with miniaturization, often dubbed as “beyond Moore’s law”.  One of the very promising areas is multiferroic tunnel junctions, i.e. magnetic tunnel junction with a ferroelectric barrier. In this talk, I will discuss our recent work on multiferroic tunnel junctions using all complex oxide structures, such as La0.7Sr0.3MnO3/BaTiO3/La0.7Sr0.3MnO3 epitaxial heterostructures.  We have first realized both spin polarized tunneling and ferroelectric tunneling in the same samples. We have then designed a new tunneling barrier which incorporates an interface layer with metal to insulator as well as ferromagnetic to antiferromagnetic phase transition. The phase transition occurs when the ferroelectric polarization of the barrier is reversed. This has dramatically increased the tunneling electroresistance (the resistance change between the two polarization states) from 30 % to 10,000%.  I will discuss the mechanism resposible for such a giant increase which include a ferroelectric driven interface magnetic reconstruction, acting as a spin valve. I will also discuss the comparison between the experimental results and the first principles calculations.

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