Effect of Interlayer Exchange Coupling on the Curie Temperature in Ga1-xMnxAs Trilayer Structures

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概要

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• We have investigated the effect of interlayer exchange coupling on the Curie temperature of ferromagnetic (FM) layers in Ga1-xMnxAs(Be)/GaAs/Ga1-xMnxAs trilayer structures. The FM layers in the trilayers contained the same concentration of Mn ($x\approx 0.046$), but the top ferromagnetic layer was additionally doped with Be. For this x the Curie temperature observed on a control single-layer sample of Be-doped Ga0.954Mn0.046As is lower than that of an undoped sample. However, in the case of trilayers, we observed that the Curie temperature of the Ga0.954Mn0.046As(Be) layer increased with decreasing thickness of the GaAs spacer separating the two FM layers. This increase in Curie temperature is due to the exchange coupling between the ferromagnetic layers mediated by the spin-polarized free carriers (holes) through the thin insulating spacer.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2004-04-15

著者

• Kang Tae

  Quantum Functional Semiconductor Research Center Dongguk University

• Im Hyunsik

  Quantum Functional Semiconductor Research Center Dongguk University

• Yuldashev Shavkat

  Quantum Functional Semiconductor Research Center Dongguk University

• KIM Yongmin

  Quantum Functional Semiconductor Research Center, Dongguk University

• Kim Nayoung

  Quantum Functional Semiconductor Research Center Dongguk University

• Sasaki Yuji

  Department Of Analytical Science Institute For Materials Resarch Tohoku Univetsity

• Furdyna Jacek

  Department Of Physics University Of Notre Dame

• Lee Sanghoon

  Department Of Biomedical Engineering College Of Medicine Dankook University

• Liu Xin

  Department Of Chemistry Dalian University Of Technology

• Kim Nayoung

  Quantum Functional Semiconductor Research Center, Dongguk University, 3-26 Pil-dong, Chung-ku, Seoul 100-715, Korea

• Kim Yongmin

  Quantum Functional Semiconductor Research Center, Dongguk University, 3-26 Pil-dong, Chung-ku, Seoul 100-715, Korea

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