Permanent magnetic properties of melt-spun (M=Cu, Nb, Zr, Ti, V, Mo) ribbons

Abstract

The crystal structure and magnetic properties of ribbons prepared by melt-spinning and subsequent heat treatment were studied, where M represents Cu, Nb, Zr, Ti, V and Mo. The as-spun ribbons have an almost amorphous structure, and the annealed ribbons consist of 2:17 carbides and a small amount of - phase. Additions of Nb, Zr, Ti, V and Mo prevent crystalline grain growth. A significant coercivity enhancement was found only in ribbons with , and the maximum coercivity at room temperature was obtained for melt-spun ribbons with x = 1 annealed in vacuum. The coercivity can be further improved for ribbons of higher carbon content annealed in a Sm atmosphere. Additions of , V and Mo do not obviously change the coercivities in ribbons annealed below 1173 K, but the coercivities for and Ti ribbons decrease greatly. A small Cu addition has little effect on the lattice parameters and Curie temperature, but decreases the saturation magnetization and the magnetocrystalline anisotropy field. Additions of Nb, Zr, Ti, V and Mo decrease the Curie temperature, the magnetocrystalline anisotropy field and the saturation magnetization.

Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy

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