Giant rectified voltages from magnetization dynamics of an atomically sharp domain wall

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Magnetization dynamics are crucial for developing atomic-scale information technology.
• Understanding spin dynamics in nanoscale ferromagnetic contacts is essential for future advancements.

Purpose of the Study:

• To explore magnetization and spin dynamics in atomic ferromagnetic contacts.
• To investigate the influence of domain walls on electrical transport properties.

Main Methods:

• Experimental investigation of atomic ferromagnetic contacts.
• Theoretical analysis using multiscale dynamic simulations.
• Radio-frequency excitation applied to study dynamic responses.

Main Results:

• Domain walls were found to induce a giant rectification effect, significantly enhancing DC voltages.
• Atomic-sized domain walls oscillate in position and size under radio-frequency excitation.
• A three-orders-of-magnitude increase in signal was observed due to resonant spin excursions.

Conclusions:

• The observed amplified rectification effect is attributed to the dynamics of atomic-sized domain walls.
• This phenomenon provides a novel tool for probing and measuring dynamical properties at the atomic scale.
• The findings have implications for the design of next-generation nanoscale electronic devices.