Manipulation of magnetic vortex parameters in disk-on-disk nanostructures with various geometry

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Magnetic nanostructures are crucial for advanced electronic devices.
• Understanding magnetization reversal in complex geometries is essential for device design.
• Permalloy (Py) is a widely used soft magnetic material.

Purpose of the Study:

• To investigate magnetization reversal in disk-on-disk permalloy nanostructures.
• To determine the influence of inter-disk spacing and external magnetic field orientation.
• To explore the control of magnetic vortex chirality and vortex core trajectory.

Main Methods:

• Fabrication of sandwich nanostructures with permalloy disks of 600 nm and 200 nm diameters.
• Magneto-optical Kerr effect (MOKE) magnetometry for experimental analysis.
• Magnetic force microscopy (MFM) imaging and micromagnetic simulations for validation.

Main Results:

• Magnetization reversal is dependent on the center-to-center distance between disks and external field orientation.
• Manipulation of magnetic vortex chirality and vortex core trajectory is achievable only in asymmetric nanostructures.
• Experimental observations of vortex core motion path and parameters are consistent with simulations.

Conclusions:

• Asymmetric disk-on-disk nanostructures offer a pathway for controlling magnetic vortex dynamics.
• The findings provide insights into the fundamental behavior of magnetic vortices in confined geometries.
• This research contributes to the development of novel magnetic memory and logic devices.