Vacancy-induced interfacial ferromagnetic features in SmFeO₃-filled graphitic carbon foam

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Carbon foam (CFM) materials offer unique structural properties.
• Samarium iron oxide (SmFeO3) is a material with interesting magnetic and ferroelectric properties.
• Investigating interfaces between carbon materials and magnetic oxides is crucial for advanced applications.

Purpose of the Study:

• To structurally and magnetically investigate carbon foam (CFM) materials infiltrated with SmFeO3 crystals.
• To understand the interfacial phenomena and their impact on magnetic properties.
• To explore potential applications in magnetic and ferroelectric devices.

Main Methods:

• High-temperature fusion and annealing techniques for material synthesis.
• Transmission Electron Microscopy (TEM) and High-Resolution TEM (HRTEM) for structural analysis.
• X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy, Vibrating Sample Magnetometry (VSM), SQUID magnetometry, and Electron Spin Resonance (ESR) for characterization.

Main Results:

• Demonstrated a defect-rich, monolayer-like CFM structure with sharp interfaces and SmFeO3 single crystals.
• Identified sp3-rich features and variable carbonate content using XPS and Raman spectroscopy.
• Observed intrinsic magnetization attributed to vacancy-rich interfacial regions in CFM, alongside contributions from SmFeO3 and alpha-Fe impurities.

Conclusions:

• Switchable interfacial magnetization exists at the carbon/SmFeO3 interface due to variable vacancy concentrations in CFM.
• The findings suggest new possibilities for developing magnetic and interfacial-driven ferroelectric devices.