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Composition-modulated hybrid tunnel junctions of La1-xSrxMnO3

Du Yong-Sheng Yan Hui Ying Qi-Ming Zhang Guo-Cheng Yu Dun-Bo Feng Jia-Feng Han Xiu-Feng

Composition-modulated hybrid tunnel junctions of La1-xSrxMnO3

Du Yong-Sheng, Yan Hui, Ying Qi-Ming, Zhang Guo-Cheng, Yu Dun-Bo, Feng Jia-Feng, Han Xiu-Feng
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  • Abstract views:  4030
  • PDF Downloads:  1025
  • Cited By: 0
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  • Received Date:  19 November 2004
  • Accepted Date:  15 February 2005
  • Published Online:  05 May 2005

Composition-modulated hybrid tunnel junctions of La1-xSrxMnO3

  • 1. (1)北京工业大学材料学院薄膜材料与技术研究室,北京 100022; (2)北京有色金属研究总院,有研稀土新材料股份有限公司,北京 100088; (3)北京有色金属研究总院,有研稀土新材料股份有限公司,北京 100088;中国科学院物理研究所磁学国家重点实验室,北京 100080;北京工业大学材料学院薄膜材料与技术研究室,北京 100022; (4)中国科学院物理研究所磁学国家重点实验室,北京 100080

Abstract: Tunnel magnetoresistance junctions with the structure of SrTiO3-sub/ La0.7Sr0.3MnO3(100nm)/La0.96Sr 0.04MnO3 (5nm)/La0.7Sr0.3MnO3 (100nm)/Ir22Mn78(15nm)/Ni79Fe21(5nm)/Pt(20nm) were micro-fabricated with lithography and Ar ion etching. T he first three epitaxial layers of La0.7Sr0.3MnO3(100nm)/La0.96Sr0.04MnO3 (5nm)/La0.7Sr0.3MnO3 (100nm) were deposited on single crystal (0 01) SrTiO3-substrate by magnetron sputtering and heat treatment, the n the spinning and top conducting layers of Ir22Mn78(1 5nm)/Ni79Fe21(5nm)/Pt(20nm) were continuously fabricat ed on top the three epitaxial layers by normal magnetron sputtering. The coloss al TMR ratio of 3270% was observed at 4.2K under the external magnetic field of 8 T. The polarization value of 97% for the La0.7Sr0.3MnO3 is well consistent with the theoretical value of 100%. The present r esults directly indicate the half-metallic ferromagnetism in La0.7Sr0.3MnO3. The high TMR value can possibly be attributed to the good interface due to the perfect barrier.

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