Electrical Control of Magnetoresistance in Highly Insulating Co-Doped ZnO

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概要

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• A Zn0.96Co0.04O film with low electron concentration (about $1.5 \times 10^{17}$ cm-3 at 21 K) on a highly conducting Zn0.99Al0.01O layer has been deposited on $a$-plane sapphire substrate by pulsed laser deposition. To study the magnetoresistance (MR) of depleted, highly insulating Co-doped ZnO an Au ohmic contact and Pd Schottky contact were deposited on the Zn0.99Al0.01O and Zn0.96Co0.04O layer, respectively. Positive MR of 30% with a current of $10^{-6}$ A was observed at 5 K. The positive MR decreases drastically at 5 K and changes to negative MR at 50 K with increasing current, which is considered to be due to the bias voltage control of the electron concentration in the Zn0.96Co0.04O layer. Our work demonstrates the electrically controllable magnetotransport behavior in insulating ZnO-based diluted magnetic semiconductors.

• 2010-04-25

著者

• Burger Danilo

  Institute Of Ion Beam Physics And Materials Research Helmholtz-zentrum Dresden-rossendorf

• Zhou Shengqiang

  Institute Of Ion Beam Physics And Materials Research Helmholtz-zentrum Dresden-rossendorf (hzdr)

• Heidemarie Schmidt

  Institut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Dresden-Rossendorf e.V., Bautzner Landstraße 400, 01328 Dresden, Germany

• Marius Grundmann

  Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany

• Michael Lorenz

  Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany

• Shengqiang Zhou

  Institut für Ionenstrahlphysik und Materialforschung, Forschungszentrum Dresden-Rossendorf e.V., Bautzner Landstraße 400, 01328 Dresden, Germany

• Xu Qingyu

  Department of Physics, Southeast University, Nanjing 211189, China

• Holger Hochmuth

  Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany

• Qingyu Xu

  Department of Physics, Southeast University, Nanjing 211189, China

• Holger Hochmuth

  Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany

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