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Researchers developed a novel magnetic probe using a domain wall (DW) in a V-shape nanostructure. This innovation enhances magnetic force microscopy (MFM) resolution and sensitivity while minimizing probe-sample interaction for advanced CMOS technology.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physics

Background:

  • Magnetic nanostructures are key for overcoming silicon scaling limits in hybrid CMOS technology.
  • Characterizing magnetization without disturbance is a critical challenge.
  • Current magnetic force microscopy (MFM) techniques often trade resolution for sensitivity.

Purpose of the Study:

  • To decouple and enhance spatial resolution and magnetic sensitivity in MFM.
  • To develop a novel magnetic probe for improved magnetization characterization.
  • To enable non-perturbative magnetic analysis of nanostructures.

Main Methods:

  • Fabrication of a V-shape nanostructure at the probe apex.
  • Utilizing a single magnetic domain wall (DW) confined within the nanostructure.
  • Employing electron holography and in situ MFM, supported by numerical simulations.

Main Results:

  • Demonstrated decoupling and simultaneous enhancement of spatial resolution and magnetic sensitivity.
  • Showcased switchable magnetic states (high/low magnetic moment) of the DW-probe due to shape anisotropy.
  • Confirmed controllability of the DW-probe state and its variable stray field intensity.

Conclusions:

  • The developed DW-probe offers a significant advancement for MFM.
  • This technology enables precise, non-perturbative magnetic characterization of nanostructures.
  • It holds promise for future developments in nanoscale magnetic devices and CMOS technology.