Experimental study demonstrates thousandfold negative isotropic magnetoresistance in perovskite La-Ca-Mn-O thin films, highlighting potential for advanced magnetic device applications.
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 0.67 Ca 0.33 MnO x . Epitaxial films that are grown on LaAIO 3 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.
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Jin et al. (1994) studied this question.
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