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Magnetic properties of single domain samarium cobalt nanoparticles

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3 Author(s)
Kirkpatrick, E.M. ; Carnegie Mellon Univ., Pittsburgh, PA, USA ; Majetich, S.A. ; McHenry, M.E.

Samarium cobalt nanoparticles were prepared by ball milling under argon, both with and without surfactant. X-ray diffraction indicated a single SmCo5 phase, with an average size of 25 nm from Debye-Scherrer analysis of the peak widths, but a broad size distribution based on TEM. SQUID magnetometry yielded the coercivity as a function of temperature between 4 and 300 K. Large coercivities (Hc=2.1 T at 10 K) were observed in the bare particles, but the values were significantly reduced (Hc=0.12 T at 5 K) for those coated with surfactant, indicating probable surface oxidation

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Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )