Abstract
We have performed first principles calculations of the electronic properties and the magnetic order at the interface of La0.7Sr0.3MnO3 and SrTiO3. The results are analysed in order to give the strength of the exchange between the surface MnO2 layer and the bulk and also the degree of the polarization of the bands. It is shown that these properties depend on the way the interface is grown. Two different interface terminations are identified and modelled. The results of the calculations compare favourably with recent experimental data.
Highlights
Spintronic devices use the information carried by the spin of electrons as well as their charge, and spin dependent tunnelling lies at the heart of their operation
First the magnetism of the surface layer should not be much lower than the bulk, second the electronic spin polarisation, P, at the surface should be high, and third if P < 1 the velocities of the majority carriers should be high and that of the minority carriers should be low [3]
If a film of LSMO is deposited on top, it will normally contain an equal number of La0.7Sr0.3O and MnO2 layers and so will be terminated by a MnO2 layer [4]
Summary
Spintronic devices use the information carried by the spin of electrons as well as their charge, and spin dependent tunnelling lies at the heart of their operation. There have recently been studies [5, 6, 7, 8, 9, 10] of the magnetic properties of LSMO/STO interface when it is grown as La0.7Sr0.3O/TiO2 and as MnO2/SrO. For SrO interfaces we find that EAF − EF M is negative, indicating that the surface layer is coupled antiferromagnetically to the bulk, this is clearly not a good candidate for a large TMR.
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