Field induced vortex dynamics in magnetic Ni nanotriangles.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Understanding magnetic states in nanomaterials is crucial for developing advanced magnetic storage and spintronic devices.
• Magnetic vortices are common ground states in magnetic nanostructures, exhibiting complex dynamics under external stimuli.

Purpose of the Study:

• To investigate the magnetization states and dynamics of nickel (Ni) triangular nanodots under an applied magnetic field.
• To correlate experimental magnetic force microscopy (MFM) data with micromagnetic simulations for accurate characterization.

Main Methods:

• Variable-field magnetic force microscopy (VF-MFM) imaging was employed to observe magnetization states.
• Micromagnetic simulations were performed to model the magnetic behavior and dynamics of the nanostructures.

Main Results:

• Experimental MFM results showed remarkable agreement with micromagnetic simulations.
• Nickel triangular nanostructures exhibit magnetic vortices as ground states, which are mobile under an applied magnetic field.
• The triangular geometry enhances the contrast of the vortex core, facilitating identification of chirality and polarization.

Conclusions:

• The combined use of VF-MFM and micromagnetic simulations accurately identifies vortex chiralities and polarizations in Ni triangular dots.
• Distinct MFM images are observed for vortices of different chiralities under an applied field, offering a method for their differentiation.