Magneto-transport and magnetic properties of (1-x) La0.7Ca0.3MnO3+xAl2O3 composites

被引：29

作者：

Thanh, T. D. ^{[2
]}

Phong, P. T. ^{[1
,2
]}

Dai, N. V. ^{[2
]}

Manh, D. H. ^{[2
]}

Khiem, N. V. ^{[3
]}

Hong, L. V. ^{[2
]}

Phuc, N. X. ^{[2
]}

机构：

[1] Nhatrang Pedag Coll, Nhatrang City, Khanhhoa, Vietnam

[2] Viet Nam Acad Sci & Technol, Inst Mat Sci, Hanoi, Vietnam

[3] Hongduc Univ, Dept Nat Sci, Thanhhoa City, Vietnam

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2011年 / 323卷 / 01期

关键词：

Manganites composite; Low field magnetoresistance; Magnetic property; Spin polarized tunneling; TEMPERATURE MAGNETORESISTANCE; ELECTRICAL-TRANSPORT;

D O I：

10.1016/j.jmmm.2010.08.060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report magneto-transport and magnetic properties of (1-x)La0.7Ca0.3MnO3+xAl(2)O(3) composites synthesized through a solid-state reaction method combined with a high energy milling method. Most interestingly, the effective magnetic anisotropy is found to decrease with increase in the non-magnetic insulating Al2O3 phase fraction in the composites. In addition, we observed that the magnitude of low-field magnetoresistance arising from spin-polarized tunneling of conduction electrons, as well as that of high-field magnetoresistance, displays a Curie-Weiss law-like behavior. Finally, we found that the temperature dependence of low and high-field magnetoresistance is controlled predominantly by the nature of temperature response of surface magnetization of the particles. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：180 / 185

页数：6

共 20 条

[1] Magneto-transport of high TCR (temperature coefficient of resistance) La2/3Ca1/3MnO3:Ag polycrystalline composites [J].

Awana, V. P. S. ;

Tripathi, Rahul ;

Balamurugan, S. ;

Kishan, H. ;

Takayama-Muromachi, E. .

SOLID STATE COMMUNICATIONS, 2006, 140 (9-10) :410-415

[2] Magnetic surface effects and low-temperature magnetoresistance in manganese perovskites [J].

Balcells, LL ;

Fontcuberta, J ;

Martinez, B ;

Obradors, X .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1998, 10 (08) :1883-1890

[3]

Dey P, 2006, PHYS REV B, V73, DOI 10.1103/PhysRevB.73.214425

[4] Improved magnetotransport in LCMO-Polymer (PPS) composite [J].

Gaur, Anurag ;

Varma, G. D. .

SOLID STATE COMMUNICATIONS, 2007, 144 (3-4) :138-143

[5] Electrical transport properties of sintered granular manganite/insulator systems [J].

Gil, L. K. ;

Baca, E. ;

Moran, O. ;

Quinayas, C. ;

Bolanos, G. .

SOLID STATE COMMUNICATIONS, 2008, 145 (1-2) :66-71

[6] The unusual magnetotransport properties of La0.67Sr0.33MnO3 with Nb2O5 addition [J].

Huang, BX ;

Liu, YH ;

Yuan, XB ;

Wang, CJ ;

Zhang, RZ ;

Mei, LM .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004, 280 (2-3) :176-183

[7] Magnetoresistance in manganite/alumina nanocrystalline composites [J].

Hueso, LE ;

Rivas, J ;

Rivadulla, F ;

López-Quintela, MA .

JOURNAL OF APPLIED PHYSICS, 2001, 89 (03) :1746-1750

[8] 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

[9] 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

[10] Low field magneto-transport in LBSMO-PMMA composite [J].

Kumar, J ;

Singh, RK ;

Siwach, PK ;

Singh, HK ;

Singh, R ;

Srivastava, ON .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2006, 299 (01) :155-160

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