Improving the energy product of hard magnetic materials

Sort, J.; Suriñach, S.; Muñoz, J. S.; Baró, M. D.; Nogués, J.; Chouteau, G.; Skumryev, V.; Hadjipanayis, G. C.

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Improving the energy product of hard magnetic materials

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Chouteau, G.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Sort, J., Suriñach, S., Muñoz, J. S., Baró, M. D., Nogués, J., Chouteau, G., et al. (2002). Improving the energy product of hard magnetic materials. Physical Review B, 65(17): 174420.

Cite as: https://hdl.handle.net/21.11116/0000-000E-EEC1-C

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).