Abstract
High-coercivity magnets with a nanometer-sized microstructure were fabricated by the shock-compaction technique using an acicular iron-alloy powder as a starting material. The magnetic properties of these magnets depended on the initial magnetic property of the acicular powder even after shock compaction and were considered to be attributed to the shape anisotropy of acicular single-domain fine particles. The preferred orientation of the acicular particles by which the powder was precompacted in the external magnetic field affected final magnetic properties of the shock-compacted magnets. The best value of the maximum energy product (BHmax) obtained in this study was 23 kJ/m3 (2.9 MG Oe), which was comparable to that of the elongated single-domain magnet.
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