Emergent Spin-Filter at the interface between Ferromagnetic and Insulating Layered Oxides

Abstract

We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ and insulating cuprate PrBa${}_2$Cu${}_3$O${}_7$. Contrary to the typically observed steady increase of the tunnel magnetoresistance with decreasing temperature, this system exhibits a sudden anomalous decrease at low temperatures. Interestingly, this anomalous behavior can be attributed to the competition between the positive spin polarization of the manganite contacts and the negative spin-filter effect from the interface-induced Cu magnetization.

5 pages, 4 figures, with supplemental materials (2 figures). Physical Review Letters, in press

References in corpus (3)

• Enhanced magneto-transport at high bias in quasi-magnetic tunnel junctions with EuS spin-filter barriers
• Unconventional proximity effect and inverse spin-switch behavior in a model manganite-cuprate-manganite trilayer system
• Tunable magnetic interaction at the atomic scale in oxide heterostructures

Cited by in corpus (7)

• Oscillatory Non-collinear Magnetism Induced by Interfacial Charge Transfer in Metallic Oxide Superlattices
• Interfacial Magnetism in Complex Oxide Heterostructures Probed by Neutrons and X-rays
• Room-temperature insulating ferromagnetic (Ni,Co)1+2xTi1-xO3 thin films
• Heat transport and electron cooling in ballistic normal-metal/spin-filter/superconductor junctions
• Effects of Strain and Buffer Layer on Interfacial Magnetization in Sr${}_2$CrReO${}_6$ Films Determined by Polarized Neutron Reflectometry
• High On/Off Ratio Memristive Switching of Manganite-Cuprate Bilayer by Interfacial Magnetoelectricity
• Quantum Boltzmann equation for spin-dependent reactions in the kinetic regime