Abstract
The properties of sputtered (Nd 2Fe 14B)/Co are reported as a function of Co content ( x) up to 22 weight % after crystallization via a rapid (30 s) anneal. We have previously shown that a rapid anneal leads to better permanent magnet properties than a longer time anneal. The added Co forms a soft phase and we find evidence in X-ray diffraction that some of the Co replaces Fe in the Nd 2Fe 14B phase. Adding Co also decreases the crystallization temperature of the Nd 2Fe 14B phase. The largest coercivity, μ 0 H c of 2.5 T, is obtained for samples with x of zero. The largest energy product is obtained for samples with intermediate values of x (6%) where we also find the exchange coupling between phases to be strong. The above results along with the magnetic reversibility and irreversibility are discussed in terms of three types of interface exchange interactions (Co–Co, Co–Nd 2Fe 14B and Nd 2Fe 14B–Nd 2Fe 14B) between grains.
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