Publication Type:Journal Article
Source:Science, Volume 264, Number 5157, p.413-415 (1994)
Keywords:Electric conductivity measurement, Epitaxial growth, Epitaxial magnetoresistive films, Giant magnetoresistance increase, Laser-ablated oxide films, Magnetic field effects, Magnetic films, manganese compounds, Manganese oxide magnetic films, oxides, Perovskite, Perovskite magnetic films, Superlattice magnetic films, superlattices, thin films
A negative isotropic magnetoresistance effect more than three orders of magnitude larger than the typical giant magnetoresistance of some superlattice films has been observed in thin oxide films of perovskite-like La 0.67Ca0.33MnOx. Epitaxial films that are grown on LaAlO3 substrates by laser ablation and suitably heat treated exhibit magnetoresistance values as high as 127,000 percent near 77 kelvin and ∼1300 percent near room temperature. Such a phenomenon could be useful for various magnetic and electric device applications if the observed effects of material processing are optimized. Possible mechanisms for the observed effect are discussed.
cited By 4504