摘要
介绍了一类具有增强磁电阻效应的新型稀土锰酸盐多晶颗粒复合体系及其化学制备方法 ,并对增强的机理进行了衩步的探讨 .
By soft chemical processing several lanthanum manganite nano\| and micron\|sized granular composites have been fabricated,including μm/nm La 2/3 Sr 1/3 MnO\-3,CoFe\-2O\-4/La 0.7 Sr 0.3 MnO 3,Nd 0.7 Sr 0.3 MnO\-3/La 0.7 Sr 0.3 MnO\-3 and La 2/3 Ca 1/3 MnO\-3/PPP(poly para\|phenyl) combined systems.Enhancement in magnetoresistance is observed in all these composites.Different compounds embedded in the granular manganites result in different temperature ranges where the enhancement occurs.It is believed that the phenomenon is associated with tunneling between various of grains and spin\|dependent scattering.
出处
《物理》
CAS
北大核心
2001年第2期100-105,共6页
Physics
基金
国家自然科学基金(批准号:29525101
29701001
29832010)
国家重点基础研究发展规划项目(批准号:G1998061314)
