Experimental evidence of pressure-induced suppression of the cobalt magnetic moment inErCo2

Abstract

X-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) measurements have demonstrated the modification of the magnetic moment of Co in ${\mathrm{ErCo}}_{2}$ induced by applying pressure. Co $K$-edge and Er ${L}_{2}$-edge XAS and XMCD spectra recorded under applied hydrostatic pressures up to $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ reveal that the modification of the magnetic properties of Co proceeds through two different pressure regimes. At low pressure, the Co atoms show an ordered magnetic moment induced by the effective field created by the Er sublattice. The Co moment progressively diminishes as the applied pressure increases, but it is not canceled for applied pressures of up to $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The results show that the pressure mainly affects the Co subsystem without affecting the magnetism of the Er sublattice.