Dynamic control of magnetization spot arrays with three-dimensional orientations

Area of Science:

• Optics and Photonics
• Materials Science
• Spintronics

Background:

• Controlling three-dimensional (3D) magnetization orientations is crucial for advanced data storage and spintronic devices.
• Existing methods often lack precise control over the 3D orientation of magnetization patterns.

Purpose of the Study:

• To introduce a novel paradigm for generating magnetization spot arrays with dynamically controllable 3D orientations.
• To demonstrate a method for achieving orientation-tunable 3D magnetization using tailored incident beams and magneto-optic effects.

Main Methods:

• Designing a phase-modulated radial polarization incident beam composed of three parts.
• Utilizing a ray-tracing model under tight focusing conditions and the inverse Faraday effect on magneto-optic (MO) films.
• Employing a multi-zone plate (MZP) phase filter to create magnetization spot arrays with individually controllable 3D orientations.

Main Results:

• Successfully generated magnetization field components along the y-axis and z-axis through focal spots.
• Achieved orientation-tunable 3D magnetization by adjusting incident beam ratios and numerical apertures.
• Demonstrated the creation of magnetization spot arrays with dynamically controlled 3D orientations in each spot using MZP phase filters.

Conclusions:

• The developed method provides a robust way to create complex 3D magnetization patterns.
• This technique offers precise control over magnetization spot orientation, beneficial for spintronics, magnetic encryption, and multi-value MO parallelized storage.