Abstract
We report on magnetic tunnel junctions entirely made up of mixed-valence manganites,La0.7Ca0.3MnO3/La0.45Ca0.55MnO3/La0.7Ca0.3MnO3.In heteroepitaxial junctions, the different Mn3+/Mn4+mixed-valence ratios can modulate the ground states throughout the trilayer,i.e. ferromagnetic metal/antiferromagnetic insulator/ferromagneticmetal. Interestingly, the tunnel magnetoresistance (TMR) ofthe device persists up to a higher temperature (T/TC ≤ 0.75, whereTCis the Curie temperature) as compared to the case for equivalent non-manganitebarrier junctions. The enhanced TMR at high temperatures in the presentjunction is discussed in relation to the properties of the unique interface betweenthe metallic ferromagnet and the antiferromagnetic tunnel barrier, such as theinterfacial bonding coherence and a magnetic interlayer coupling.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
