三层膜中特殊的内磁场效应  

SPECIAL INTRA MAGNETIC FIELD EFFECT IN TRILAYERED THIN FILMS

作　　者：高洁[1,2] 汤业庆[1,2] 

机构地区：[1]新疆大学物理系 [2]中国科技大学结构分析开放实验室

出　　处：《低温物理学报》1998年第2期99-103,共5页Low Temperature Physical Letters

摘　　要：本文用直流溅射法在（１００）ＬａＡｌＯ３单晶基片上制备了ＬＳＭＯ／ＰＣＭＯ／ＬＳＭＯ三层膜，并研究了三层膜的电、磁特性．在零磁场下，三层膜的电阻率随中间层Ｐｒ０．７Ｃａ０．３ＭｎＯ３＋δ厚度的增加而显著下降，转变温度向高温区移动．中间层ＰＣＭＯ的作用相当于提供了一个内磁场．中间层厚度的不同，其电阻的变化不同．电阻的变化率为ΔＲ／ＲＬＰＬ＝－２７０％，转变温度在１５０Ｋ左右．Abstract La 0.67 Sr 0.33 MnO 3+ δ /Pr 0.7 Ca 0.3 MnO 3+ δ /La 0.67 Sr 0.33 MnO 3+ δ (LPL) trilayer films have been grown on LaAlO 3(100) substrates by using direct cuurrent(DC) magnetron sputtering method . We studied the electronic properties and magnetoresistance (MR) effects of them .When the trilayered films is in zero magnetic field , the resistivy decreases greatly and the peak temperature ( T p ) increases with the increasing of the thickness of middle layered PCMO .These results imply that there may exist an intra magnetic field in the trilayered film. Under zero magnetic field, the maximum resisstivity change is about -270 percent near 150K. Possible mechanisms are discussed.

关 键 词：LSMO PCMO LSMO 薄膜 内磁场效应 巨磁阻 

分 类 号：O484.43[理学—固体物理]