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Spin injection and detection in lanthanum- and niobium-doped SrTiO3 using the Hanle technique

Author

Listed:
  • Wei Han

    (IBM Almaden Research Center)

  • Xin Jiang

    (IBM Almaden Research Center)

  • Adam Kajdos

    (University of California)

  • See-Hun Yang

    (IBM Almaden Research Center)

  • Susanne Stemmer

    (University of California)

  • Stuart S. P. Parkin

    (IBM Almaden Research Center)

Abstract

There has been much interest in the injection and detection of spin-polarized carriers in semiconductors for the purposes of developing novel spintronic devices. Here we report the electrical injection and detection of spin-polarized carriers into Nb-doped strontium titanate single crystals and La-doped strontium titanate epitaxial thin films using MgO tunnel barriers and the three-terminal Hanle technique. Spin lifetimes of up to ~100 ps are measured at room temperature and vary little as the temperature is decreased to low temperatures. However, the mobility of the strontium titanate has a strong temperature dependence. This behaviour and the carrier doping dependence of the spin lifetime suggest that the spin lifetime is limited by spin-dependent scattering at the MgO/strontium titanate interfaces, perhaps related to the formation of doping induced Ti3+. Our results reveal a severe limitation of the three-terminal Hanle technique for measuring spin lifetimes within the interior of the subject material.

Suggested Citation

  • Wei Han & Xin Jiang & Adam Kajdos & See-Hun Yang & Susanne Stemmer & Stuart S. P. Parkin, 2013. "Spin injection and detection in lanthanum- and niobium-doped SrTiO3 using the Hanle technique," Nature Communications, Nature, vol. 4(1), pages 1-6, October.
  • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3134
    DOI: 10.1038/ncomms3134
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    Cited by:

    1. Jiawei Zhou & Hangtian Zhu & Qichen Song & Zhiwei Ding & Jun Mao & Zhifeng Ren & Gang Chen, 2022. "Mobility enhancement in heavily doped semiconductors via electron cloaking," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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