La2/3Sr1/3MnO3/ZnO混合物薄膜的磁电阻和伏安特性研究

doi:10.3724/sp.j.1077.2009.00591

无机材料学报

La_2/3Sr_1/3MnO₃/ZnO混合物薄膜的磁电阻和伏安特性研究

金克新, 赵省贵, 谭兴毅, 陈长乐

西北工业大学理学院应用物理系，西安 710072

收稿日期:2008-07-23 修回日期:2008-09-09 出版日期:2009-05-20 网络出版日期:2009-05-20

Magnetroresistance and Currentvoltage Characteristics in La_2/3Sr_1/3MnO₃/ZnO Composite Films

JIN Ke-Xin, ZHAO Sheng-Gui, TAN Xing-Yi, CHEN Chang-Le

Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China

Received:2008-07-23 Revised:2008-09-09 Published:2009-05-20 Online:2009-05-20

摘要/Abstract

摘要： 利用脉冲激光沉积的方法在Si（100）氧化成SiO₂的基片上制备了(La_2/3Sr_1/3MnO₃)_x/(ZnO)_1-_x混合物薄膜，研究了薄膜的磁电阻和伏安特性. X射线衍射分析表明，除了衬底SiO₂的衍射峰以外，分别出现了La_2/3Sr_1/3MnO₃（101）的衍射峰和ZnO（002）的衍射峰，且它们形成了两相共存体系. 实验表明：x=0.3的混合物薄膜表现为半导体导电特性，而x=0.4的样品则出现了典型的金属绝缘相变. 所制备的样品表现出了低场磁电阻效应和非线性伏安特性. 在0.7T磁场的作用下，x=0.3的样品在温度为60K时取得的最大磁电阻值为28.8%. 通过对伏安关系拟合表明，在La_2/3Sr_1/3MnO₃和ZnO颗粒之间存在一定的耗尽层，且产生了界面缺陷态.

关键词: 锰氧化物颗粒薄膜, 磁电阻效应, 伏安特性

Abstract: agnetroresistance and currentvoltage characteristics of the composite (La_2/3Sr_1/3MnO₃)_x/(ZnO)_1-_xfilms prepared by the pulsed laser deposition method on Si(100) substrates oxidized by SiO₂ were investigated. XRD patterns indicate that ZnO and LSMO have (002) and (101) dominant orientations, respectively, and they form the coexisting system of two phases. Experimental results show the film with x=0.3 favors a semiconductive conduction and the film with x=0.4 exhibits the typical insulatormetal (I-M) transition. The films have the low field magnetoresistance（LFMR） effect and the nonlinear currentvoltage characteristics. The maximum LFMR value of the film with x=0.3 is about 28.8% at T=60K under an applied magnetic field of about 0.7T. The currentvoltage fitting shows that a great number of interface states appear at the depletion between La_2/3Sr_1/3MnO₃ and ZnO grains due to the mismatch of the lattice.

Key words: manganites composite film, magnetoresistance, currentvoltage characteristics

中图分类号:

TM271
O51

金克新,赵省贵,谭兴毅,陈长乐. La_2/3Sr_1/3MnO₃/ZnO混合物薄膜的磁电阻和伏安特性研究[J]. 无机材料学报, DOI: 10.3724/sp.j.1077.2009.00591.

JIN Ke-Xin,ZHAO Sheng-Gui,TAN Xing-Yi,CHEN Chang-Le. Magnetroresistance and Currentvoltage Characteristics in La_2/3Sr_1/3MnO₃/ZnO Composite Films[J]. Journal of Inorganic Materials, DOI: 10.3724/sp.j.1077.2009.00591.

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La_2/3Sr_1/3MnO₃/ZnO混合物薄膜的磁电阻和伏安特性研究

Magnetroresistance and Currentvoltage Characteristics in La_2/3Sr_1/3MnO₃/ZnO Composite Films

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