Effect of Tb substitution on the magnetic properties of exchange-biased Nd2Fe14B/Fe3B
Tb-substituted (Nd,Tb)2Fe14B/Fe3B nanocomposite ribbons have been synthesized by melt spinning of Nd3Tb1Fe76Cu0.5Nb1B18.5 alloys. Tb substitution has significantly enhanced the value of coercivity and Curie temperature. Highest value of coercivity has been obtained as 4.76 kOe for the sample annealed at 953 K for 10 min. Curie temperature of Tb substituted sample, Nd3Tb1Fe76Cu0.5Nb1B18.5 is 549 K while Curie temperature of the sample without Tb, Nd4Fe76Cu0.5Nb1B18.5 is 535 K. Recoil hysteresis loops measured along the major demagnetization curve are steep having small recoil loop area. Temperature dependence of coercivity, remanent ratio and maximum energy product have been measured for the sample annealed at 893 K and 923 K for 10 min. At 5 K, coercivity and maximum energy product of the sample annealed at 893 K for 10 min are 5.2 kOe and 11.5 MGOe respectively and the sample annealed at 923 K for 10 min are 6 kOe and 13.1 MGOe respectively.
KeywordsHysteresis Loop Remanence Hard Phase Anisotropy Field Spin Reorientation
The authors acknowledge with deep sense of gratitude the support provided by Prof. Per Nordblad, Solid State Physics, Dept. of Eng. Sci., Uppsala University, Sweden. Financial support provided by the International Program for Physical Sciences, Uppsala University, Sweden is acknowledged. The authors acknowledge kind help provided by Prof. N. X. Phuc, Director Institute of Materials Science, Vietnamese Academy of Science and Technology. The authors also acknowledge the kind support provided by Dr. S. I. Bhuiyan, Chairman, Bangladesh Atomic Energy Commission and Engr. Rezaul Bari, Director, Atomic Energy Centre, Dhaka.