Temperature tuned defect induced magnetism in reduced graphene oxide

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Ferromagnetism in graphene is crucial for spintronics and memory devices.
• Defects are theoretically linked to ferromagnetism in graphene.
• Understanding temperature effects on graphene's magnetic properties is vital for applications.

Purpose of the Study:

• To investigate defect-induced ferromagnetism in chemically reduced graphene.
• To determine the impact of elevated temperatures on these magnetic properties and defects.
• To explore the relationship between temperature, defects, and magnetism in graphene.

Main Methods:

• Chemically reduced graphene samples were prepared.
• The effect of elevated temperatures (specifically 600 °C) on magnetism and defects was analyzed.
• Material quality and magnetization changes were observed post-treatment.

Main Results:

• Ferromagnetism was observed in chemically reduced graphene, attributed to defects.
• Elevated temperature treatment (600 °C) reduced the number of defects in graphene.
• Simultaneously, the ferromagnetism of the graphene samples decreased with defect reduction.

Conclusions:

• Temperature plays a critical role in controlling both magnetism and defects in graphene.
• A self-repair mechanism at 600 °C mends defects but diminishes ferromagnetism.
• High-temperature treatment yields higher quality graphene with reduced defects and magnetism.