Author/Authors :
Zhang، نويسنده , , Hongwei and Zhang، نويسنده , , Wen-Yong and Yan، نويسنده , , A-Ru and Sun، نويسنده , , Zhigang and Shen، نويسنده , , Bao-Gen and Tung، نويسنده , , I-Chung and Chin، نويسنده , , Tsung-Shune Chin، نويسنده ,
Abstract :
Nanocomposite Nd3.6Pr5.4Fe83Co3B5 ribbons were prepared by direct melt spinning at different wheel speeds. The hysteresis loop of the ribbons prepared at wheel speed V=20 m/s shows a single hard magnetic behavior with high coercivity. The values of remanence Mr=11.3 kG s, intrinsic coercivity iHc=6.0 kOe and energy product (BH)max=17.2 MG Oe are obtained at room temperature. Transmission electron microscopy and magnetic force microscopy have been employed to image the microstructure and magnetic domains in the ribbons. Due to the unnegligible inter-grain exchange coupling, interaction domains are observed. The shape of the demagnetization curve in the second quadrant at different temperature gives more information about inter-grain exchange coupling. The coercivity mechanism is discussed.
