Induced magnetic ordering in alloyed compounds based on Pauli paramagnet YCo${}_2$

Abstract

Intermetallic YCo${}_2$ compound is a Pauli exchange-enhanced paramagnet. Structural and magnetic properties of rapidly quenched YCo${}_2$ and YCo${}_2$ alloyed with Nb or Ti are presented. Samples produced by melt spinning have been characterized by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). The samples crystallize in MgCu${}_2$-type phase with lattice constant a changing from 7.223 A for YCo${}_2$, through 7.213 A for Y${}_{0.9}$Nb${}_{0.1}$Co${}_2$ to 7.192 A for Y${}_{0.9}$Ti${}_{0.1}$Co${}_2$, where Y atoms are replaced by Nb or Ti atoms. Nanocrystalline phases can be produced by appropriate cooling rates for the solidification process. By the synthesis process free volumes, vacancies, and alloyed atoms are introduced into the YCo${}_2$ intermetallic. Ab-initio calculations have been performed to investigate the effects of substitution on the spin-split electronic band structure in the ordered YCo${}_2$. A ferrimagnetic ground state is found in the alloyed systems with substitution on the Y-site which is energetically favorable compared to point defects on Co-sites. However, the experimentally found increased magnetic ordering in alloyed YCo${}_2$ appears to be based on microstructure effects.

References in corpus (1)

• Room temperature soft ferromagnetism in the nanocrystalline form of YCo2 - a well-known bulk Pauli paramagnet

Cited by in corpus (4)

• Normal and inverse magnetocaloric effects in structurally disordered Laves phase Y${}_{1-x}$Gd${}_x$Co${}_2$ (0 $\le$ x $\le$ 1) compounds
• Influence of structural disorder on magnetic properties and electronic structure of YCo${}_2$
• Monte Carlo calculations of Curie temperatures of Y${}_{1-x}$Gd${}_x$(Fe${}_{1-y}$Co${}_y$)${}_2$ pseudobinary system
• Emergence of ferromagnetic state due to structural disorder in pseudo-binary Ce(Fe0.9Co0.1)2 compound