Abstract
In this work we examine the effect of small boron substitution (x=0, 0.005, 0.010, 0.015) on the structural and magnetic properties of Sm(Co0.86−xFe0.1Zr0.04Bx)7.5 and Sm(Co0.74−xFe0.1Cu0.12Zr0.04Bx)7.5 melt-spun samples, as a function of wheel speed and annealing conditions. Boron substituted as-spun ribbons are found to have increased coercivity, Hc>5 kOe, and small grain size of 60–100 nm. For copper containing samples, the highest coercivity (Hc=16.3 kOe) was obtained in as-spun ribbons with x=0.015. In samples without copper the coercivity increased after short annealing (Hc=12 kOe for x=0.015). The large coercivities are attributed to a fine microstructure consisting mainly of hexagonal TbCu7-type phase and a small amount of soft-phase grains.
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