La-Ca-Mn-O巨磁电阻薄膜的电阻变化

Change in Resistivity in the Giant Magnetoresistance (GMR) La-Ca-Mn-O Films

研究了类钙钛矿结构La0 .67Ca0 .33MnOx 巨磁电阻薄膜 (生长在LaAlO3衬底 )的电阻变化 ,观察到负巨磁电阻效应 ,讨论了优化制备工艺提高巨磁电阻效应和最大电阻温度 ,其效应可用于设计新电磁器件。同时讨论了巨磁电阻效应的机理 ,给出合理解释。

A negative giant magnetoresistance (GMR) effect has been ovserved in thin oxide films of perovskite-like La 0.68 Ca 0.32 MnO 3 on LaAlO 3 substrates.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.