Beilstein Journal of Nanotechnology (Apr 2024)

Modulated critical currents of spin-transfer torque-induced resistance changes in NiCu/Cu multilayered nanowires

  • Mengqi Fu,
  • Roman Hartmann,
  • Julian Braun,
  • Sergej Andreev,
  • Torsten Pietsch,
  • Elke Scheer

DOI
https://doi.org/10.3762/bjnano.15.32
Journal volume & issue
Vol. 15, no. 1
pp. 360 – 366

Abstract

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We present a novel method combining anodic aluminum oxide template synthesis and nanolithography to selectively deposit vertically patterned magnetic nanowires on a Si substrate. With this approach we fabricated three-dimensional nanowire-based spin valve devices without the need of complex etching processes or additional spacer coating. Through this method, we successfully obtained NiCu/Cu multilayered nanowire arrays with a controlled sequence along the long axis of the nanowires. Both magnetic switching and excitation phenomena driven by spin-polarized currents were clearly demonstrated in our NiCu/Cu multilayered nanowires. Moreover, the critical currents for switching and excitation were observed to be modulated in an oscillatory manner by the magnetic field in the nanowire-based devices. We present a toy model to qualitatively explain these observations.

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