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.
Received: 13 March 2007
Revised: 11 April 2007
Accepted manuscript online:
PACS:
73.50.Jt
(Galvanomagnetic and other magnetotransport effects)
Fund: Project supported
by the National Natural Science Foundation of China (Grant Nos
10474133 and 10674169).
Cite this article:
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 La0.9Ca0.1MnO3+$\delta$ and 1 wt.% Nb-doped SrTiO3 2007 Chinese Physics 16 3120
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