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Lateral Magnetically Modulated Multilayers by Combining Ion Implantation and Lithography.

Enric Menéndez1, Hiwa Modarresi1, Claire Petermann1

  • 1KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200 D, 3001, Leuven, Belgium.

Small (Weinheim an Der Bergstrasse, Germany)
|January 10, 2017
PubMed
Summary

Researchers created patterned magnetic multilayers using lithography and ion implantation. This technique yields alternating Cobalt and Cobalt-Oxide lines, demonstrating giant magnetoresistance for spintronic applications.

Keywords:
ion implantationlateral multilayerslithographymagnetoresistanceplanar technology

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Lateral multilayers are crucial for advanced spintronic devices.
  • Fabricating complex nanoscale magnetic patterns presents significant challenges.

Purpose of the Study:

  • To demonstrate a method for preparing laterally modulated magnetic multilayers.
  • To investigate the magnetic and magnetoresistance properties of patterned Co/Co-CoO structures.

Main Methods:

  • Utilizing a combination of photolithography and oxygen ion implantation.
  • Masking a gold-sandwiched cobalt thin film to create alternating Co and Co-CoO lines.
  • Measuring magnetoresistance at room temperature and low temperature (10 K).

Main Results:

  • Successfully fabricated microscale patterns of alternating Co (1.6 µm) and Co-CoO (2.4 µm) lines.
  • Observed positive giant magnetoresistance (GMR) at room temperature.
  • Distinguished anisotropic magnetoresistance and GMR contributions at 10 K due to exchange coupling in O-implanted areas.

Conclusions:

  • The lithography and ion implantation method is effective for creating lateral multilayers.
  • The observed planar GMR is attributed to modulated coercivity and domain wall formation.
  • This versatile technique enables the fabrication of planar spintronic systems.