All-optically configuring the inverse Faraday effect for nanoscale perpendicular magnetic recording

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Ultrahigh-density perpendicular magnetic recording requires nanoscale control of magnetization.
• Reversing longitudinal magnetization (Mz) at the nanoscale is crucial for advanced data storage.

Purpose of the Study:

• To propose a novel all-optical method for nanoscale reversal of longitudinal magnetization (Mz).
• To achieve Mz reversal with an ultrasmall lateral size using the inverse Faraday effect (IFE).

Main Methods:

• Numerical simulation of an all-optical method.
• Configuring the inverse Faraday effect (IFE) with optical coherent control.
• Utilizing destructive interference by adjusting the intensity of peripheral focal spot regions.

Main Results:

• Demonstrated nanoscale reversal of Mz with lateral dimensions below 30 nm in one dimension.
• Achieved controlled Mz reversal through optical coherent configuration of IFE with opposite signs in central and peripheral regions.
• Successfully reduced the size of reversed Mz by increasing peripheral region intensity.

Conclusions:

• The proposed all-optical IFE method offers a viable route for nanoscale magnetic reversal.
• This technique is vital for advancing ultrafast nanoscale perpendicular magnetic recording.
• The ability to control Mz reversal size is critical for future data storage technologies.