Magnetic and structural properties of high remanence Nd8(FeCo)88B4 prepared by mechanical milling

The effect of Co substitution for Fe on the structure and magnetic properties of mechanically milled Nd8Fe88B4 has been investigated. As-milled Nd8(Fe1−xCox)88B4 (x=0–0.6) alloys exhibited a two-phase mixture consisting of an amorphous phase and a bcc FeCo phase. Optimal annealing of the as-milled samples led to the formation of a nanocrystalline mixture of Nd2(FeCo)14B and a bcc FeCo phase. The optimally annealed samples exhibited single-phase magnetic behavior and remanence enhancement. Replacement of up to 20% of Fe by Co increased both remanence and coercivity. Over substitution of Co and heat treatment at temperatures exceeding 600 °C caused the deterioration of both remanence and coercivity.

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