Coercivity and transmission electron microscopy study of nanocomposite Sm{endash}Co powders by mechanical alloying

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364623· OSTI ID:496611

Chen, S K; Tsai, J L ^[1]; Chin, T S ^[2]

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1. Department of Materials Science, Feng Chia University, Taichung, 407, Taiwan, Republic of (China)
2. Department of Materials Science and Engineering, Tsing Hua University, 300, Hsinchu, Taiwan, Republic of (China)

A nanocomposite Sm{sub 2}Co{sub 17}/Co magnet with a composition of Sm{sub 7}Co{sub 93} was prepared by mechanical alloying. A domain{endash}wall pinning mechanism was found to be dominant in the magnet, as investigated using Kronm{umlt u}ller{close_quote}s micromagnetic theory. Transmission electron microscopy micrographs indicate that the half width between neighboring Co grains is about 40 nm. This value is two times larger than the range factor, {ital r}{sub 0}, obtained from Kronm{umlt u}ller{close_quote}s model. It appears that crystallographic defects other than the cobalt particles also play an important role in coercivity. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496611
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT
COBALT ALLOYS
COERCIVE FORCE
COMPOSITE MATERIALS
DOMAIN STRUCTURE
EXCHANGE INTERACTIONS
FERROMAGNETIC MATERIALS
GRAIN SIZE
MICROSTRUCTURE
PERMANENT MAGNETS
POWDERS
SAMARIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY