The Sr content influence on the positive magnetoresistance in La1-xSrxMnO3/Si heterojunctions

doi:10.1088/1674-1056/19/8/087301

中国物理B ›› 2010, Vol. 19 ›› Issue (8): 87301-087301.doi: 10.1088/1674-1056/19/8/087301

The Sr content influence on the positive magnetoresistance in La_1-xSr_xMnO₃/Si heterojunctions

杨芳, 金奎娟, 黄延红, 何萌, 吕惠宾, 杨国桢

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2010-04-21 修回日期:2010-05-12 出版日期:2010-08-15 发布日期:2010-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 50672120).

The Sr content influence on the positive magnetoresistance in La_1-xSr_xMnO₃/Si heterojunctions

Yang Fang(杨芳), Jin Kui-Juan(金奎娟), Huang Yan Hong(黄延红), He Meng(何萌), LÜ Hui-Bin(吕惠宾)^†, and Yang Guo-Zhen(杨国桢)

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2010-04-21 Revised:2010-05-12 Online:2010-08-15 Published:2010-08-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 50672120).

摘要/Abstract

摘要： We fabricated La_1-xSr_xMnO₃/Si (LSMO/Si) heterojunctions with different Sr doping concentrations (x = 0.1, 0.2, 0.3) in LSMO and studied the Sr content influence on magnetoresistance (MR) ratio. The heterojunctions show positive MR and high sensitivity of MR ratio in a low applied magnetic field. The MR ratio is dependent on Sr content and the low Sr doping in LSMO causes a large positive MR in LSMO/Si junctions. The MR ratio for 0.1 Sr doping in the LSMO/Si heterostructure is 116% in 100 Oe (1 Oe=79.5775 A/m) at 210 K. The mechanism for the positive MR dependence on the doping density is considered to be the competition between the tunneling rate of electrons in e_g¹ ↑ to t_2g ↓ band and that to e_g² ↑ band at the interface region of LSMO. The experimental results are in agreement with those observed in La_0.9Sr_0.1MnO₃/SrNb_0.01Ti_0.99O₃ p-n junction. The results indicate that choosing low doping concentration to improve the low field sensitivity of the heterojunction deveces is a very efficacious method.

Abstract: We fabricated La_1-xSr_xMnO₃/Si (LSMO/Si) heterojunctions with different Sr doping concentrations (x = 0.1, 0.2, 0.3) in LSMO and studied the Sr content influence on magnetoresistance (MR) ratio. The heterojunctions show positive MR and high sensitivity of MR ratio in a low applied magnetic field. The MR ratio is dependent on Sr content and the low Sr doping in LSMO causes a large positive MR in LSMO/Si junctions. The MR ratio for 0.1 Sr doping in the LSMO/Si heterostructure is 116% in 100 Oe (1 Oe=79.5775 A/m) at 210 K. The mechanism for the positive MR dependence on the doping density is considered to be the competition between the tunneling rate of electrons in e_g¹ ↑ to t_2g ↓ band and that to e_g² ↑ band at the interface region of LSMO. The experimental results are in agreement with those observed in La_0.9Sr_0.1MnO₃/SrNb_0.01Ti_0.99O₃ p-n junction. The results indicate that choosing low doping concentration to improve the low field sensitivity of the heterojunction deveces is a very efficacious method.

Key words: heterojunctions, magnetoresistance

中图分类号: (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)

73.40.Lq

61.72.S- (Impurities in crystals) 73.40.Gk (Tunneling) 73.50.Jt (Galvanomagnetic and other magnetotransport effects) 73.61.-r (Electrical properties of specific thin films) 75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

杨芳, 金奎娟, 黄延红, 何萌, 吕惠宾, 杨国桢. The Sr content influence on the positive magnetoresistance in La_1-xSr_xMnO₃/Si heterojunctions[J]. 中国物理B, 2010, 19(8): 87301-087301.

Yang Fang(杨芳), Jin Kui-Juan(金奎娟), Huang Yan Hong(黄延红), He Meng(何萌), LÜ Hui-Bin(吕惠宾), and Yang Guo-Zhen(杨国桢). The Sr content influence on the positive magnetoresistance in La_1-xSr_xMnO₃/Si heterojunctions[J]. Chin. Phys. B, 2010, 19(8): 87301-087301.

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The Sr content influence on the positive magnetoresistance in La_1-xSr_xMnO₃/Si heterojunctions

The Sr content influence on the positive magnetoresistance in La_1-xSr_xMnO₃/Si heterojunctions

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