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Effective magnetic switching of terahertz signals in planar structured spintronic emitters

Evgeny A. Karashtin1,2,*, Nikita S. Gusev1, Maksim V. Sapozhnikov1,2, Pavel Yu. Avdeev3, Ekaterina D. Lebedeva3, Anastasiya V. Gorbatova3, Arseniy M. Buryakov3, and Elena D. Mishina3

  • *Contact author: eugenk@ipmras.ru
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Phys. Rev. Applied 22, 054075 – Published 26 November, 2024

DOI: https://doi.org/10.1103/PhysRevApplied.22.054075

Abstract

We demonstrate an efficient switchable spintronic terahertz emission from a Co(2 nm)/Pt(2 nm) bilayer split into a grating of microstripes or nanostripes in applied external magnetic field of the order of 10 mT. The terahertz signal is effectively emitted if the samples are magnetized perpendicular to the stripes direction and decreases upon a 90∘ rotation of a sample. The maximal 27-fold ratio of amplitude change is achieved for the sample with a 2μm width of stripes. For the samples with easy magnetization axis directed perpendicular to stripes the terahertz signal is linearly polarized in the direction of the stripes and abruptly switches during the sample remagnetization process. If the easy axis is along the stripes, the terahertz source is almost switched off in a zero magnetic field.

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References (30)

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Phys. Rev. Applied 22, 054075– Published 26 November, 2024
  • Received 1 August 2024
  • Revised 24 September 2024
  • Accepted 4 November 2024
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