Magnetic properties of ball-milled Mn nanoparticles

✍ Scribed by W. Abdul-Razzaq; Min Wu

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 213 KB
• Volume: 29
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.2000.0970

✦ Synopsis

Nanoparticles of Mn of sizes <500 Å were prepared by the ball-milling technique. The temperature dependence of the magnetic susceptibility χ showed systematic variation with particle size. Peaks observed in χ were attributed to the magnetic ordering of the oxides Mn 3 O 4 and MnO. Peaks found in ∂(χ T )/∂ T were associated with the Neel temperature of α-Mn. We estimated that our samples contain about 0.4% of Mn 3 O 4 . This low concentration of Mn 3 O 4 was not detected by X-ray diffraction experiments but contributed significantly to the magnetization measurements.