Magnetic properties of single domain samarium cobalt nanoparticles

Author

Kirkpatrick, E.M. ; Majetich, S.A. ; McHenry, M.E.

Author_Institution

Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

4502

Lastpage

4504

Abstract

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 (H_c=2.1 T at 10 K) were observed in the bare particles, but the values were significantly reduced (H_c=0.12 T at 5 K) for those coated with surfactant, indicating probable surface oxidation

Keywords

X-ray diffraction; cobalt alloys; coercive force; ferromagnetic materials; magnetic particles; nanostructured materials; oxidation; particle size; powder metallurgy; samarium alloys; transmission electron microscopy; 0.12 T; 2.1 T; 25 nm; 4 to 300 K; Debye-Scherrer analysis; SQUID magnetometry; SmCo₅; TEM; X-ray diffraction; average size; ball milling; bare particles; broad size distribution; coercivity; magnetic properties; peak widths; single SmCo₅ phase; single domain samarium cobalt nanoparticles; surface oxidation; surfactant; Argon; Ball milling; Cobalt; Coercive force; Magnetic analysis; Magnetic properties; Nanoparticles; SQUIDs; Samarium; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.538911

Filename

538911