Norbert M. Nemes
Departamento de Fisica Aplicada III
Universidad Complutense de Madrid
"Signatures of a Two-Dimensional Ferromagnetic Electron Gas at the La0.7Sr0.3MnO3/SrTiO3Interface Arising From Orbital Reconstruction"
Viernes 6 de marzo, 10:30, sala 300
Norbert M. Nemes
Departamento de Fisica Aplicada III
Universidad Complutense de Madrid
"Signatures of a Two-Dimensional Ferromagnetic Electron Gas at the La0.7Sr0.3MnO3/SrTiO3Interface Arising From Orbital Reconstruction"
Viernes 6 de marzo, 10:30, sala 300
The interface between two different oxides has properties different from the ones corresponding to the constituent layers in bulk. Different orders can arise due to the complexity of these materials in which the orbital degree of freedom, magnetism and lattice are strongly interdependent. Here we present a joint theoretical/experimental effort to understand the properties of a multilayer formed by a metallic ferromagnetic manganite oxide (La0.7Sr0.3MnO3) and the insulating SrTiO3. Magnetoresistance measurements as a function of the relative angle between the magnetic field and the interface plane have shown an unexpected in-plane peak. Calculations of resistivity in a model system including spin-orbit coupling reveal that the unexpected in-plane maximum is due to transport through a two-dimensional ferromagnetic electron gas formed by orbital reconstruction at the manganite interface. These orbital and magnetic reconstructions are supported by X-ray linear dichroism and ab-initio calculations. These results were published in [Advanced Materials DOI:10.1002/adma.201402829].
Further insight can be gained to the behaviour of the system by studying the magnetic anisotropy in detail, using high frequency ferromagnetic resonance and torque magnetometry, supported by simulations.
