Spin-polarized tunneling spectroscopy in tunnel junctions with half-metallic electrodes

Abstract

We have studied the magnetoresistance (TMR) of tunnel junctions with electrodes of La2/3Sr1/3MnO3 and we show how the variation of the conductance and TMR with the bias voltage can be exploited to obtain a precise information on the spin and energy dependence of the density of states. Our analysis leads to a quantitative description of the band structure of La2/3Sr1/3MnO3 and allows the determination of the gap delta between the Fermi level and the bottom of the t2g minority spin band, in good agreement with data from spin-polarized inverse photoemission experiments. This shows the potential of magnetic tunnel junctions with half-metallic electrodes for spin-resolved spectroscopic studies.

To appear in Physical Review Letters

References in corpus (3)

• Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments
• Half-Metallicity of LSMO
• Novel Quantum Spin Assisted Tunneling in Half Metallic Manganite Tunnel Junctions

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• Emergent Spin-Filter at the interface between Ferromagnetic and Insulating Layered Oxides
• Interfacial Magnetism in Complex Oxide Heterostructures Probed by Neutrons and X-rays
• Transient quantum isolation and critical behavior in the magnetization dynamics of half-metallic manganites
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