Role of boundaries on low-field magnetotransport properties of La0.7Sr0.3MnO3-based nanocomposite thin films

被引：22

作者：

Chen, Aiping ^{[1
]}

Zhang, Wenrui ^{[1
]}

Jian, Jie ^{[1
]}

Wang, Haiyan ^{[1
]}

Tsai, Chen-Fong ^{[2
]}

Su, Qing ^{[2
]}

Jia, Quanxi ^{[3
]}

MacManus-Driscoll, Judith L. ^{[4
]}

机构：

[1] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA

[2] Texas A&M Univ, Mat Sci & Engn Program, College Stn, TX 77843 USA

[3] Los Alamos Natl Lab, Ctr Integrated Nanotechnol CINT, Div Mat Phys & Applicat, Los Alamos, NM 87545 USA

[4] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

来源：

JOURNAL OF MATERIALS RESEARCH | 2013年 / 28卷 / 13期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

ELECTRICAL-TRANSPORT; MAGNETORESISTANCE;

D O I：

10.1557/jmr.2013.89

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of boundaries such as grain boundaries and phase boundaries on low-field magnetoresistance (LFMR) have been investigated in single-phase lanthanum strontium manganates, in this case La0.7Sr0.3MnO3 (LSMO) and LSMO: zinc oxide (ZnO) nanocomposite thin films. In the pure LSMO films with similar grain size, it is found that the LFMR increases as the grain misorientation factor (beta) increases. The LFMR in the nanocomposite films is greatly enhanced, as compared with single-phase films, due to the reduced grain size, and increased phase boundary (PB) and b effects. The composition study shows that the LFMR can be dramatically enhanced when the secondary phase content approaches the percolation threshold. The increased b and secondary phase concentration reduce the cross-section of electron conduction paths and favor the formation of the quasi-one-dimensional transport channels. Our results demonstrate that the reduction of cross-section of the electron conduction paths by tuning the grain orientation and secondary phase composition is necessary for enhancing LFMR effect.

引用

页码：1707 / 1714

页数：8

共 29 条

[1]

[Anonymous], APPL PHYS LETT

[2] La0.7Ca0.3MnO3/Mn3O4 composites: Does an insulating secondary phase always enhance the low field magnetoresistance of manganites? [J].

Bhame, S. D. ;

Fagnard, J. -F. ;

Pekala, M. ;

Vanderbemden, P. ;

Vertruyen, B. .

JOURNAL OF APPLIED PHYSICS, 2012, 111 (06)

[3] Microstructural and magnetic properties of (La0.7Sr0.3MnO3)0.7:(Mn3O4)0.3 nanocomposite thin films [J].

Bi, Zhenxing ;

Weal, Emily ;

Luo, Hongmei ;

Chen, Aiping ;

MacManus-Driscoll, Judith L. ;

Jia, Quanxi ;

Wang, Haiyan .

JOURNAL OF APPLIED PHYSICS, 2011, 109 (05)

[4] Grain boundary strengthening in alumina by rare earth impurities [J].

Buban, JP ;

Matsunaga, K ;

Chen, J ;

Shibata, N ;

Ching, WY ;

Yamamoto, T ;

Ikuhara, Y .

SCIENCE, 2006, 311 (5758) :212-215

[5] Microstructure, vertical strain control and tunable functionalities in self-assembled, vertically aligned nanocomposite thin films [J].

Chen, Aiping ;

Bi, Zhenxing ;

Jia, Quanxi ;

MacManus-Driscoll, Judith L. ;

Wang, Haiyan .

ACTA MATERIALIA, 2013, 61 (08) :2783-2792

[6] Magnetotransport properties of quasi-one-dimensionally channeled vertically aligned heteroepitaxial nanomazes [J].

Chen, Aiping ;

Zhang, Wenrui ;

Khatkatay, Fauzia ;

Su, Qing ;

Tsai, Chen-Fong ;

Chen, Li ;

Jia, Q. X. ;

MacManus-Driscoll, Judith L. ;

Wang, H. .

APPLIED PHYSICS LETTERS, 2013, 102 (09)

[7] Tilted Aligned Epitaxial La0.7Sr0.3MnO3 Nanocolumnar Films with Enhanced Low-Field Magnetoresistance by Pulsed Laser Oblique-Angle Deposition [J].

Chen, Aiping ;

Bi, Zhenxing ;

Tsai, Chen-Fong ;

Chen, Li ;

Su, Qing ;

Zhang, Xinghang ;

Wang, Haiyan .

CRYSTAL GROWTH & DESIGN, 2011, 11 (12) :5405-5409

[8] Tunable Low-Field Magnetoresistance in (La0.7Sr0.3MnO3)0.5:(ZnO)0.5 Self-Assembled Vertically Aligned Nanocomposite Thin Films [J].

Chen, Aiping ;

Bi, Zhenxing ;

Tsai, Chen-Fong ;

Lee, JoonHwan ;

Su, Qing ;

Zhang, Xinghang ;

Jia, Quanxi ;

MacManus-Driscoll, Judith L. ;

Wang, Haiyan .

ADVANCED FUNCTIONAL MATERIALS, 2011, 21 (13) :2423-2429

[9] Microstructure, magnetic, and low-field magnetotransport properties of self-assembled (La0.7Sr0.3MnO3)0.5:(CeO2)0.5 vertically aligned nanocomposite thin films [J].

Chen, Aiping ;

Bi, Zhenxing ;

Hazariwala, Harshad ;

Zhang, Xinghang ;

Su, Qing ;

Chen, Li ;

Jia, Quanxi ;

MacManus-Driscoll, Judith L. ;

Wang, Haiyan .

NANOTECHNOLOGY, 2011, 22 (31)

[10] Electrical properties and enhanced room temperature magnetoresistance in La0.7Ca0.2Sr0.1MnO3/Pd composites prepared by chemical plating [J].

Chen, F. Y. ;

Wu, Y. Y. ;

Xiong, Y. H. ;

Li, L. J. ;

Liu, Z. L. ;

Xiong, C. S. .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2012, 324 (20) :3286-3290

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