Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-02-06
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 18 figures
Scientific paper
10.1103/PhysRevB.78.024405
A spin-tunnel-junction based on manganites, with La$_{1-x}$Sr$_x$MnO$_3$ (LSMO) as ferromagnetic metallic electrodes and the undoped parent compound LaMnO$_3$ (LMO) as insulating barrier, is here theoretically discussed using double exchange model Hamiltonians and numerical techniques. For an even number of LMO layers, the ground state is shown to have anti-parallel LSMO magnetic moments. This highly resistive, but fragile, state is easily destabilized by small magnetic fields, which orient the LSMO moments in the direction of the field. The magnetoresistance associated with this transition is very large, according to Monte Carlo and Density Matrix Renormalization Group studies. The influence of temperature, the case of an odd number of LMO layers, and the differences between LMO and SrTiO$_3$ as barriers are also addressed. General trends are discussed.
Costamagna S.
Dagotto Elbio
Riera José A.
Yunoki Seiji
No associations
LandOfFree
Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3 as Insulating Barrier does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3 as Insulating Barrier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3 as Insulating Barrier will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-560243