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Current-induced domain-wall switching in a ferromagnetic semiconductor structure

Author

Listed:
  • M. Yamanouchi

    (Research Institute of Electrical Communication, Tohoku University)

  • D. Chiba

    (Research Institute of Electrical Communication, Tohoku University)

  • F. Matsukura

    (Research Institute of Electrical Communication, Tohoku University
    Japan Science and Technology Agency)

  • H. Ohno

    (Research Institute of Electrical Communication, Tohoku University
    Japan Science and Technology Agency)

Abstract

Magnetic information storage relies on external magnetic fields to encode logical bits through magnetization reversal. But because the magnetic fields needed to operate ultradense storage devices are too high to generate, magnetization reversal by electrical currents is attracting much interest as a promising alternative encoding method. Indeed, spin-polarized currents can reverse the magnetization direction of nanometre-sized metallic structures through torque1,2,3,4; however, the high current densities of 107–108 A cm-2 that are at present required exceed the threshold values tolerated by the metal interconnects of integrated circuits5,6. Encoding magnetic information in metallic systems has also been achieved by manipulating the domain walls at the boundary between regions with different magnetization directions7,8,9,10,11,12,13, but the approach again requires high current densities of about 107 A cm-2. Here we demonstrate that, in a ferromagnetic semiconductor structure, magnetization reversal through domain-wall switching can be induced in the absence of a magnetic field using current pulses with densities below 105 A cm-2. The slow switching speed and low ferromagnetic transition temperature of our current system are impractical. But provided these problems can be addressed, magnetic reversal through electric pulses with reduced current densities could provide a route to magnetic information storage applications.

Suggested Citation

  • M. Yamanouchi & D. Chiba & F. Matsukura & H. Ohno, 2004. "Current-induced domain-wall switching in a ferromagnetic semiconductor structure," Nature, Nature, vol. 428(6982), pages 539-542, April.
  • Handle: RePEc:nat:nature:v:428:y:2004:i:6982:d:10.1038_nature02441
    DOI: 10.1038/nature02441
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    Cited by:

    1. Wenjie Zhang & Tianping Ma & Binoy Krishna Hazra & Holger Meyerheim & Prajwal Rigvedi & Zihan Yin & Abhay Kant Srivastava & Zhong Wang & Ke Gu & Shiming Zhou & Shouguo Wang & See-Hun Yang & Yicheng Gu, 2024. "Current-induced domain wall motion in a van der Waals ferromagnet Fe3GeTe2," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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