Vol. 43, Issue 1, pp. 117-122 (2013)

Abstract

In this paper, the nanocrystalline (Nd_0.85Dy_0.15)₁₀Fe₈₃Zr₁B₆ ribbons produced by melt-spinning have been investigated by the X-ray diffraction method (XRD), vibrating sample magnetometer (VSM) and magnetic force microscopy (MFM). The XRD studies showed that material investigated was mainly composed of Re₂Fe₁₄B and α-Fe phases with fine grain sizes of 25 and 9 nm, respectively. The magnetic parameters determined from the hysteresis loop measurements are as follows: μ₀H_C = 0.96 T, μ₀M_R = 0.76 T, μ₀M_S = 1.09 T, (BH)_max = 88 kJ/m³. The large remanence ratio (μ₀M_R/μ₀M_S) of 0.7 results from the exchange coupling between the soft and hard magnetic grains. The large surface interaction domains revealed by MFM confirmed the existence of strong exchange coupling between nanosize grains.