Abstract
Bulk nanocrystalline NdFe1.9 cubic Laves alloy was synthesized by melt-spinning and subsequent high-pressure annealing. It was found that NdFe1.9 cubic Laves phase could not be obtained by annealing the as-spun amorphous ribbons at ambient pressure. In contrast, the sample annealed under high-pressure shows almost single cubic Laves phase with an average grain size about 30nm. The temperature dependence of a.c. initial susceptibility exhibits an abnormal at 140K, corresponding to the spin reorientation taking place from <110> to <100>. A low intrinsic coercivity of 25Oe is observed at 300K, indicating a tiny hysteresis loss at ambient temperature. The intrinsic coercivity increases to 3.9kOe with decreasing temperature to 5K, which can be associated with the narrow domain walls. The room-temperature magnetostriction was investigated using standard strain gauge technique.
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