| Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La0.9Ca0.1MnO3 +δ and 1 wt.% Nb-doped SrTiO3 |
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| 引用本文： | 谢燕武,王登京,沈保根,孙继荣.Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La0.9Ca0.1MnO3 +δ and 1 wt.% Nb-doped SrTiO3[J].中国物理 B,2007,16(10):3120-3124. |
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| 作者姓名： | 谢燕武 王登京 沈保根 孙继荣 |
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| 作者单位： | Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China;Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China;Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China;Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing 100080,
China |
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| 基金项目： | Project supported
by the National Natural Science Foundation of China (Grant Nos
10474133 and 10674169). |
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| 摘 要： | A junction composed of ultrathin La0.9Ca0.1MnO3＋δ （LCMO） film and 1 wt.% Nb-doped SrTiO3 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 （Tc） and downward below TC. 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.
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| 关 键 词： | 磁致电阻 水锰矿 铁磁体 自旋 |
| 收稿时间： | 2007-03-13 |
| 修稿时间： | 2007-03-13 |
Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La0.9Ca0.1MnO3 +δ and 1 wt.% Nb-doped SrTiO3 |
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| Xie Yan-Wu,Wang Deng-Jing,Shen Bao-Gen and Sun Ji-Rong.Rotation of ferromagnetic clusters induced magnetoresistance in the junction composed of La0.9Ca0.1MnO3 +δ and 1 wt.% Nb-doped SrTiO3[J].Chinese Physics B,2007,16(10):3120-3124. |
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| Authors: | Xie Yan-Wu Wang Deng-Jing Shen Bao-Gen and Sun Ji-Rong |
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| Institution: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | A junction composed of ultrathin La0.9Ca0.1MnO3 + \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. |
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| Keywords: | manganite magnetoresistance manganite junction ferromagnetic clusters |
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