Conduction control at ferroic domain walls via external stimuli.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Nano-sized domain walls exhibit unique properties, enabling new nanoelectronic applications.
• Ferroic domain walls are crucial for novel electronic functionalities.
• Controlling domain wall properties is key for device development.

Purpose of the Study:

• To explore modulating the local conduction of ferroic domain walls.
• To investigate the effects of external electrical fields, magnetic fields, and light on domain wall conductivity.
• To demonstrate multifunctional control of domain wall properties in BiFeO₃.

Main Methods:

• Electrical transport measurements to assess domain wall mobility modulation via gating voltage.
• Ferromagnetic/antiferromagnetic coupling to probe inherent magnetism at domain walls.
• Magnetotransport measurements to observe magnetic field effects on domain wall conduction.
• Photo-transport measurements to demonstrate light-induced modulation of domain wall conductivity.

Main Results:

• Electrical modulation of 90° domain wall mobility in BiFeO₃ was achieved using gating voltage.
• Inherent magnetism at domain walls was confirmed through ferromagnetic/antiferromagnetic coupling.
• A giant positive magnetoresistance (up to 200%) was observed under magnetic field control.
• Light successfully modulated domain wall conduction, enhancing current by a factor of 2.

Conclusions:

• Demonstrated multifunctional tunability of ferroic domain wall conduction using electric, magnetic, and light stimuli.
• Highlighted the potential of domain wall nanoelectronics for advanced applications.
• Provided new insights into controlling domain wall properties for future device designs.