Proposal for a Domain Wall Nano-Oscillator driven by Non-uniform Spin Currents

Area of Science:

• Spintronics
• Condensed Matter Physics
• Nanoelectronics

Background:

• Magnetic domain walls offer rich physics and potential for nanoelectronic devices.
• Existing spintronic devices face challenges in stability and tunability.

Purpose of the Study:

• To propose a new mechanism and device concept for a robust, magnetic field-tunable radio-frequency (RF) oscillator.
• To explore the self-oscillation of magnetic domain walls for RF signal generation.

Main Methods:

• Utilizing a spatially non-uniform vertical DC spin current and a uniform static magnetic field.
• Inducing periodic translation of a magnetic domain wall between two unstable positions.

Main Results:

• Demonstrated stable self-oscillation of a magnetic domain wall under noise.
• Achieved a quality factor exceeding 1000 for the RF oscillator.
• Showcased the potential for magnetic field tunability.

Conclusions:

• The proposed mechanism provides a stable RF oscillator based on magnetic domain wall dynamics.
• This advancement is a step towards all-domain wall logic schemes and spintronic applications.
• The device concept holds promise for future nanoelectronic architectures like racetrack memory.