Mechanically milled Pr4.25Tb1Fe71Co2.5Cr3B18 has been annealed to produce a
material comprising a (Pr,Tb)(2)(Fe,Co)(14)B hard phase intimately mixed w
ith (Fe,Cr)(2)B and alpha-Fe soft phases. Susceptibility and magnetic visco
sity measurements have been used to characterise the reversal process in th
e temperature range 20-300 K. (C) 1999 Elsevier Science B.V. All rights res
erved.