Large room-temperature magnetoresistance in ultra-thin La0.67Sr0.33MnO3/Nb : SrTiO3 junction
Large room-temperature magnetoresistance in ultra-thin La0.67Sr0.33MnO3/Nb : SrTiO3 junction
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DOI：
10.1088/0022-3727/42/18/185008
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Y. Xie;J. Sun;D. Wang;D. Guo;B. Liang;B. Shen
中科院分区：
文献类型：
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作者：
Y. Xie;J. Sun;D. Wang;D. Guo;B. Liang;B. Shen
We present a manganite–titanate junction composed of a 5 nm La0.67Sr0.33MnO3 film and a 1 wt% Nb-doped SrTiO3 substrate, which exhibits a considerable magnetic field effect. The magnetoresistance (MR = (RH − R0)/R0) of the junction is weak in the forward direction but large in the reverse direction. At 300 K, a 5 T magnetic field can lead to a MR larger than −15%. Under a 5 T field, the MR at −1 V is no less than −10% in a wide temperature range from 10 to 310 K. As a comparison, the MR in the junction based on the 150 nm La0.67Sr0.33MnO3 film is weak and the MR in the junction based on the 2 nm La0.67Sr0.33MnO3 film is large only at relatively low temperatures. These results provide a unique possibility of fabricating junctions with large room-temperature MR by tuning the thickness of the manganite film.
