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Rapidly solidified nanocrystalline α-Fe/Nd2Fe14B alloys with enhanced coercivity were obtained by melt spinning. The effects of Ti addition on the microstructure and magnetic properties of the nanocomposite α-Fe/Nd2Fe14B alloys were investigated by X-ray diffraction (XRD) and superconducting quantum interference device (SQUID) magnetometer. The analysis of XRD showed that Vα-Fe estimated to be about 35.3% in the Ti-free α-Fe/Nd2Fe14B nanocomposites decreased down to 26.5% as the addition of was 5 at.% Ti. Accordingly, adding Ti resulted in relevant improvements of magnetic properties, especially of the coercivity Hc from 595 kA/m up to 1006 kA/m. The dependence of Mirrev(H)/2Mr on the reverse field H indicated that nucleation was the dominating mechanism for the magnetization reversal in these nanocomposites. The analysis of the temperature dependence of the demagnetization curve in the α-Fe/Nd2Fe14B nanocomposite magnets indicated that a reduction of αex could play a leading role in an increase in the coercivity of Ti-doped sample.
Rapid effects of Ti addition on the microstructure and magnetic properties of the nanocomposite α-Fe / Nd2Fe14B alloys were investigated by X-ray diffraction (XRD) and superconducting The analysis of XRD showed that Vα-Fe estimated to be about 35.3% in the Ti-free α-Fe / Nd2Fe14B nanocomposites decreased down to 26.5% as the addition of was 5 at.% Ti. The dependence of Mirrev (H) / 2Mr on the reverse field H indicated that nucleation was the dominating mechanism for the magnetization reversal in these nanocomposites. The analysis of the temperature dependence of the demagnetization curve in the α-Fe / Nd2Fe14B nanocomposite magnets indicates that a reduction of αex could play a leading rol e in an increase in the coercivity of Ti-doped sample.