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Abstract:
A route toward enhancing the energy product (BH)(max) of
permanent magnetic materials, at room temperature, based on
ferromagnetic-(FM-) antiferromagnetic (AFM) exchange
interactions has been developed. The exchange coupling, which
is induced by ball milling hard magnetic SmCo5 with AFM NiO
powders, results in an enhancement of coercivity H-C and
squareness ratio M-R/M-S (remnant-saturation magnetizations),
which depends on the FM:AFM ratio and the processing
conditions. However, the presence of the AFM in the composite
results also in a competing effect, i.e., reduction of the
overall saturation magnetization, which decreases (BH)(max).
Nevertheless, it has been found that after an optimization of
the FM:AFM ratio and the milling conditions it is possible to
achieve an improvement of (BH)(max).
