A Novel Design of a 3D Racetrack Memory Based on Functional Segments in Cylindrical Nanowire Arrays

Area of Science:

• Materials Science
• Nanotechnology
• Computer Engineering

Background:

• Racetrack memory stores data as magnetic domains (bits) on nanowires (tracks).
• 3D racetrack memory enhances storage density using vertically aligned nanowires.
• Current methods require external writing heads, complicating device architecture.

Purpose of the Study:

• To propose a novel 3D racetrack memory configuration with integrated writing capabilities.
• To demonstrate a new method for writing data directly within the racetrack nanowire.
• To enhance storage density and simplify the architecture of racetrack memory devices.

Main Methods:

• Micromagnetic simulations were employed to analyze the proposed memory configuration.
• The study utilized functional magnetic segments with differing coercivities within nanowires.
• The efficacy was tested in a 7-nanowire array, simulating a larger 3D configuration.

Main Results:

• A novel 3D racetrack memory design integrates writing elements within the nanowire track.
• Selective magnetic segments allow independent magnetization reversal for writing operations.
• Spin-polarized current pulses successfully move and store magnetic bits within the nanowire.

Conclusions:

• The proposed integrated writing system is effective for 3D racetrack memory.
• This design simplifies device architecture by eliminating external writing heads.
• The method shows potential for high-density data storage using template-electrodeposition techniques.