Enhanced magnetoresistance in La0.7Sr0.3MnO3 nanoscaled granular composites

被引：12

作者：

Huang, YH ^{[1
]}

Yan, CH ^{[1
]}

Wang, ZM ^{[1
]}

Xu, ZG ^{[1
]}

Zhu, T ^{[1
]}

Liao, CS ^{[1
]}

Gao, S ^{[1
]}

Xu, GX ^{[1
]}

机构：

[1] Peking Univ, State Key Lab Rare Earth Mat Ch & Applicat, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan Che, Beijing 100871, Peoples R China

来源：

SCIENCE IN CHINA SERIES B-CHEMISTRY | 2000年 / 43卷 / 06期

关键词：

lanthanum manganites; granular composites; magnetoresistance;

D O I：

10.1007/BF02969503

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

By soft chemical processing, two kinds of nanoscaled lanthanum manganite granular composites, La0.7Sr0.3MnO3/CoFe2O4 (LSMO/CF) and La0.7Sr0.3MnO3/ Nd0.7Sr0.3MnO3 (LSMO/ NSMO), were fabricated. Enhancement in magnetoresistance is observed in both of the composites. Different magnetic compounds, CF and NSMO, embedded in LSMO matrix, result in different temperature ranges where the enhancement occurs. it is considered that the phenomenon is associated with electron tunneling between sorts of grains as well as spin-dependent scattering.

引用

页码：561 / 566

页数：6

共 12 条

[1] Enhanced field sensitivity close to percolation in magnetoresistive La2/3Sr1/3MnO3/CeO2 composites [J].

Balcells, L ;

Carrillo, AE ;

Martínez, B ;

Fontcuberta, J .

APPLIED PHYSICS LETTERS, 1999, 74 (26) :4014-4016

[2] Chemical synthesis and magnetic study of nanocrystalline thin films of cobalt spinel ferrites [J].

Cheng, FX ;

Peng, ZY ;

Liao, CS ;

Xu, ZG ;

Gao, S ;

Yan, CH ;

Wang, DJ ;

Wang, J .

SOLID STATE COMMUNICATIONS, 1998, 107 (09) :471-476

[3] Magnetoresistance of chromium dioxide powder compacts [J].

Coey, JMD ;

Berkowitz, AE ;

Balcells, L ;

Putris, FF ;

Barry, A .

PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3815-3818

[4] Soft chemical synthesis and transport properties of La0.7Sr0.3MnO3 granular perovskites [J].

Huang, YH ;

Xu, ZG ;

Yan, CH ;

Wang, ZM ;

Zhu, T ;

Liao, CS ;

Gao, S ;

Xu, GX .

SOLID STATE COMMUNICATIONS, 2000, 114 (01) :43-47

[5] Spin-polarized intergrain tunneling in La-2/Sr-3(1)/3MnO3 [J].

Hwang, HY ;

Cheong, SW ;

Ong, NP ;

Batlogg, B .

PHYSICAL REVIEW LETTERS, 1996, 77 (10) :2041-2044

[6] THOUSANDFOLD CHANGE IN RESISTIVITY IN MAGNETORESISTIVE LA-CA-MN-O FILMS [J].

JIN, S ;

TIEFEL, TH ;

MCCORMACK, M ;

FASTNACHT, RA ;

RAMESH, R ;

CHEN, LH .

SCIENCE, 1994, 264 (5157) :413-415

[7] Low-field magnetoresistive properties of polycrystalline and epitaxial perovskite manganite films [J].

Li, XW ;

Gupta, A ;

Xiao, G ;

Gong, GQ .

APPLIED PHYSICS LETTERS, 1997, 71 (08) :1124-1126

[8] Spin-dependent electronic transport in granular ferromagnets [J].

Milner, A ;

Gerber, A ;

Groisman, B ;

Karpovsky, M ;

Gladkikh, A .

PHYSICAL REVIEW LETTERS, 1996, 76 (03) :475-478

[9] Temperature and bias dependence of magnetoresistance in doped manganite thin film trilayer junctions [J].

Sun, JZ ;

Abraham, DW ;

Roche, K ;

Parkin, SSP .

APPLIED PHYSICS LETTERS, 1998, 73 (07) :1008-1010

[10] Characterization of La0.67Ca0.33MnO3±δ particles prepared by the sol-gel route [J].

Vazquez-Vazquez, C ;

Blanco, MC ;

Lopez-Quintela, M ;

Sanchez, RD ;

Rivas, J ;

Oseroff, SB .

JOURNAL OF MATERIALS CHEMISTRY, 1998, 8 (04) :991-1000

← 1 2 →