Antiferromagnetic half-skyrmions and bimerons at room temperature

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Topologically protected spin textures like skyrmions are promising for post-CMOS computing but face limitations in ferromagnets.
• Antiferromagnetic materials offer potential for faster, scalable spintronic devices, yet experimental realization has been challenging.

Purpose of the Study:

• To experimentally demonstrate and stabilize novel topological antiferromagnetic spin textures.
• To explore the potential of these textures for low-energy, room-temperature spintronic applications.

Main Methods:

• Utilized alpha-Fe2O3, an Earth-abundant oxide insulator, capped with a platinum overlayer.
• Employed a first-order Kibble-Zurek mechanism analogue to create merons, antimerons, and bimerons.
• Investigated chemical control via tuning exchange and anisotropy, and magnetic field/temperature cycling for texture manipulation.

Main Results:

• Successfully realized a family of topological antiferromagnetic spin textures (merons, antimerons, bimerons) in alpha-Fe2O3.
• Demonstrated control over texture formation and erasure using magnetic fields and temperature cycling.
• Achieved characteristic sizes around 100 nanometers with potential for further scaling.

Conclusions:

• The realized antiferromagnetic spin textures are prime candidates for low-energy spintronics at room temperature.
• This work overcomes previous limitations of ferromagnetic spin textures and provides a pathway for practical antiferromagnetic spintronic devices.