Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La0.9Ca0.1MnO3 +δ and 1 wt.% Nb-doped SrTiO3

doi:10.1088/1009-1963/16/10/050

中国物理B ›› 2007, Vol. 16 ›› Issue (10): 3120-3124.doi: 10.1088/1009-1963/16/10/050

Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La_0.9Ca_0.1MnO_{3 +δ} and 1 wt.% Nb-doped SrTiO₃

谢燕武, 王登京, 沈保根, 孙继荣

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

收稿日期:2007-03-13 修回日期:2007-04-11 出版日期:2007-10-08 发布日期:2007-10-08
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos 10474133 and 10674169).

Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La_0.9Ca_0.1MnO_3+$\delta$ and 1 wt.% Nb-doped SrTiO₃

Xie Yan-Wu(谢燕武)^†, Wang Deng-Jing (王登京), Shen Bao-Gen(沈保根), and Sun Ji-Rong(孙继荣)

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

Received:2007-03-13 Revised:2007-04-11 Online:2007-10-08 Published:2007-10-08
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos 10474133 and 10674169).

摘要/Abstract

摘要： A junction composed of ultrathin La_0.9Ca_0.1MnO_{3 + \delta} (LCMO) film and 1 wt.{\%} Nb-doped SrTiO$_{3}$ was fabricated and its magnetoresistance (MR) was studied and compared with LCMO film. It was found that the resistance of the junction has a similar dependence on magnetic field as that of the LCMO film: the curvature of $R$--$H$ curves is upward above Curie temperature ($T_{\rm C}$) and downward below $T_{\rm C}$. These behaviours strongly suggest that the rotation of ferromagnetic clusters in manganite also causes MR in the corresponding junction. This MR can be qualitatively understood by the change of the width of the barrier induced by the rotation of ferromagnetic clusters. These results suggest a possibility to obtain junctions with large low-field MR.

关键词: manganite, magnetoresistance, manganite junction, ferromagnetic clusters

Abstract: A junction composed of ultrathin La_0.9Ca_0.1MnO_{3 +$\delta$} (LCMO) film and 1 wt.% Nb-doped SrTiO$_{3}$ was fabricated and its magnetoresistance (MR) was studied and compared with LCMO film. It was found that the resistance of the junction has a similar dependence on magnetic field as that of the LCMO film: the curvature of $R$--$H$ curves is upward above Curie temperature ($T_{\rm C}$) and downward below $T_{\rm C}$. These behaviours strongly suggest that the rotation of ferromagnetic clusters in manganite also causes MR in the corresponding junction. This MR can be qualitatively understood by the change of the width of the barrier induced by the rotation of ferromagnetic clusters. These results suggest a possibility to obtain junctions with large low-field MR.

Key words: manganite, magnetoresistance, manganite junction, ferromagnetic clusters

中图分类号: (Galvanomagnetic and other magnetotransport effects)

73.50.Jt

73.40.-c (Electronic transport in interface structures) 73.61.Ng (Insulators) 75.47.Gk (Colossal magnetoresistance) 75.47.Lx (Magnetic oxides)

谢燕武, 王登京, 沈保根, 孙继荣. Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La_0.9Ca_0.1MnO_{3 +δ} and 1 wt.% Nb-doped SrTiO₃[J]. 中国物理B, 2007, 16(10): 3120-3124.

Xie Yan-Wu(谢燕武), Wang Deng-Jing (王登京), Shen Bao-Gen(沈保根), and Sun Ji-Rong(孙继荣). Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La_0.9Ca_0.1MnO_3+$\delta$ and 1 wt.% Nb-doped SrTiO₃[J]. Chinese Physics, 2007, 16(10): 3120-3124.

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Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La_0.9Ca_0.1MnO_{3 +δ} and 1 wt.% Nb-doped SrTiO₃

Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La_0.9Ca_0.1MnO_3+$\delta$ and 1 wt.% Nb-doped SrTiO₃

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