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Paper detail

Optimal interface doping at La_2/3Sr_1/3MnO_3/SrTiO_3(001) heterojunctions for spintronic applications

We examine, by means of ab initio pseudopotential calculations, La_2/3Sr_1/3MnO_3/SrTiO_3 (LSMO/STO) heterojunctions in which one unit layer of La_(1-x)Sr_xMnO_3 (with 0<x<1) is inserted at the interface. The optimal interlayer doping x for a robust interface ferromagnetism is investigated by considering the energy differences between antiferromagnetic and ferromagnetic alignment of the MnO_2-interface layer relative to bulk LSMO. The optimal doping is found to be close to x=1/3, which corresponds to an abrupt TiO_2 (001)-layer termination of STO. This is also the composition which gives the largest p-type Schottky barrier height in our calculations.

preprint2013arXivOpen access
C. WangN. StojicN. Binggeli
cond-mat.mtrl-sci
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C. WangN. StojicN. Binggeli

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