INVESTIGADORES
GRANJA Leticia Paula
artículos
Título:
Translating reproducible phase-separated texture in manganites into reproducible two-state low-field magnetoresistance: an imaging and transport study
Autor/es:
C. ISRAEL; L. GRANJA; T. M. CHUANG; L. E. HUESO; D. SANCHEZ; J. L. PRIETO; P. LEVY; A. DE LOZANNE; N. D. MATHUR
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2008 vol. 78 p. 54409 - 54414
ISSN:
0163-1829
Resumen:
In thin-film La0.6Ca0.4MnO3, conducting-tip and magnetic force microscopy reveal a pattern of nanoscale phase separation that is reproducible across cooling runs. This pattern represents the intersection of buried three-dimensional filamentary ferromagnetic metallic pathways with the sample surface. As an interlayer in current-perpendicular-to-the-plane trilayer devices, this phase-separated material magnetically decouples ferromagnetic metallic La0.7Ca0.3MnO3 electrodes which switch sharply. This yields sharp two-state low-field magnetoresistance that is also reproducible across cooling runs. The reproducibility and the magnitude of the resistance jump are linked to highly resistive 10−12 m2 constrained domain walls in the pathways of the phase-separated interlayer. Phase separation is normally associated with high-field colossal magnetoresistance and, therefore, its exploitation here to produce low-field effects is unusual.
