Title :
Effects of Co substitution on the magnetic and microstructural properties of melt-spun Pr7Tb1Fe87-xCoxNb0.5Zr0.5B4 nanocomposites
Author :
Wang, H.L. ; Zhang, Y. ; Jin, Z.Q. ; Hadjipanayis, G.C.
Author_Institution :
Dept. of Phys. & Astron., Univ. of Delaware, Newark, DE, USA
Abstract :
The magnetic and microstructural properties of melt-spun Pr7Tb1Fe87-xCoxNb0.5Zr0.5B4 (x = 0,10,20,30) nanocomposites have been investigated. Optimum magnetic properties are found with coercivity Hc = 6.84 kOe and (BH)m = 11.8 MGOe in the sample of Pr7Tb1Fe87Nb0.5Zr5B4. For the samples with x = 10, 20, and 30, both the coercivity and the energy product decrease. The main reason for this deterioration is the decrease in the anisotropy of 2 : 14 : 1 phase and the changing morphology of α-Fe and 2 : 14 : 1 phases. Co also increases the Curie temperature of all the phases present, including the hard and soft phases.
Keywords :
Curie temperature; boron alloys; cobalt alloys; coercive force; exchange interactions (electron); ferromagnetic materials; iron alloys; magnetic anisotropy; melt spinning; nanocomposites; niobium alloys; permanent magnets; praseodymium alloys; terbium alloys; zirconium alloys; α-Fe phase; Co substitution; Curie temperature; Pr7Tb1Fe87Nb0.5Zr5B4; Pr7Tb1Fe87Nb0.5Zr5B4-Co; anisotropy; coercivity; energy product; exchange coupling; hard phases; magnetic properties; melt-spun Pr7Tb1Fe87-xCoxNb0.5Zr0.5B4 nanocomposites; microstructural properties; optimum magnetic properties; soft phases; Anisotropic magnetoresistance; Coercive force; Iron; Magnetic anisotropy; Magnetic properties; Morphology; Nanocomposites; Niobium; Perpendicular magnetic anisotropy; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.815753
