  The electrical resistance of magnetic domain walls in ferromagnetic metallic
manganites can be enhanced to 10-12 Ohm.m2 by patterning nanoconstrictions [J.
Appl. Phys. 89, 6955 (2001)]. We show equally large enhancements in a phase
separated La0.60Ca0.40MnO3 manganite film without recourse to nanopatterning.
The domain walls were measured in the current-perpendicular-to-the-plane (CPP)
geometry between ferromagnetic metallic La0.70Ca0.30MnO3 electrodes patterned
like magnetic tunnel junctions.
