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Three-dimensional magnetization needle arrays with controllable orientation.

Jianjun Luo, Henwen Zhang, Sicong Wang

|February 16, 2019

Summary

This summary is machine-generated.

Researchers developed a new method to create 3D arrays of magnetic needles (MNs) with controlled orientation and position. This technique offers potential for advanced data storage and spintronics applications.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Generating precisely controlled magnetic fields at the nanoscale is crucial for advanced data storage and spintronics.
Existing methods often lack the flexibility to control the orientation and spatial arrangement of magnetic elements.

Purpose of the Study:

To propose and demonstrate a novel scheme for generating three-dimensional (3D) arrays of magnetic needles (MNs).
To achieve arbitrary orientation control for each individual MN, along with controllable spatial position and number.
To explore the application of these MN arrays in hybrid bit-patterned media recording.

Main Methods:

Utilizing Richards-Wolf vectorial diffraction theory and the inverse Faraday effect.
Employing an electric dipole array with orthogonal oscillation directions and quadrature phase, arranged mirror-symmetrically.
Optimizing the arrangement of electric dipole array units to control MN properties.

Main Results:

Successfully generated 3D MN arrays with subwavelength lateral size (0.44λ) and significant longitudinal depth (5.36λ).
Achieved MNs with four different orientations and discussed their purity.
Demonstrated the potential of orthogonal MN arrays in hybrid bit-patterned media recording.

Conclusions:

The proposed method provides a versatile platform for locally controlling the orientation properties of MNs.
These controllable 3D MN arrays hold significant potential for applications in multichannel/multilayer magneto-optical storage, information security, and spintronics.