MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Magnetic Properties of Mechanically Milled Sm-Co Permanent Magnetic Materials with the TbCu7 Structure
Raphael Justin JoseyphusAlwarramanujam NarayanasamyRaghavan GopalanVenkatasubramanian ChandrasekaranBalachandran JeyadevanKazuyuki Tohji
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2006 Volume 47 Issue 9 Pages 2264-2268

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Abstract

The magnetic properties of Sm(Co,Fe,Cu,Zr)7 compound with the TbCu7 structure are studied for the mechanically milled samples. The coercivity could be varied, without affecting the saturation magnetization, from 44 kA/m for the micron sized particles to 280 kA/m by reducing the particle size to sub-micron size (600–900 nm) using high-energy ball milling. The enhancement in the coercivity is attributed to the particles approaching single domain size. The presence of dipolar coupling suggests that the grain sizes are well above the exchange length for the milled samples. The thermal measurements indicate that the compound with the TbCu7 structure is not stable at high temperatures beyond 743 K.

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© 2006 The Japan Institute of Metals and Materials
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