Abstract
Nd12.3Fe81.7−xZrxB6.0 (x=0, 1.5) and (NdDyTb)12.3(FeZrNbCu)81.7−yCoyB6.0 (y=0, 12) ribbons were prepared by melt spinning at 22 m/s and subsequent annealing. The influences of Zr, Dy/Tb and Co substitutions on magnetic properties and spin reorientation transitions of nanophase Nd2Fe14B have been systematically investigated. Compared with Zr-free sample, the remanence, intrinsic coercivity and maximum energy product for Nd12.3Fe80.2Zr1.5B6.0 ribbon increase by 10.8 %, 17.8 % and 60.2 %, respectively. The significant improvement of magnetic properties originates from the finer grains of the sample by introducing Zr, which leads to the stronger exchange coupling between neighboring grains. The intrinsic coercivity for (DyTb)-substituted ribbon is significantly increased although the remanence is reduced, which could be compensated by the substitution of Co for Fe. The spin reorientation temperature Tsr of nanocrystalline Nd2Fe14B alloys was determined by measuring the ac magnetic susceptibility. It was found to be lower than that of bulk Nd2Fe14B. The substitutions of Zr, Dy/Tb and Co result in reduction of Tsr. The smaller the grain size, the lower the Tsr will be. Influence of spin reorientation on magnetization characteristics of nanophase Nd2Fe14B was discussed.
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