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Magnetization dynamics in Fe$_x$Co$_{1-x}$ in presence of chemical disorder

Banasree SadhukhanRaghuveer ChimataBiplab SanyalAbhijit Mookerjee
Oct 2015
摘要
In this paper, we present a theoretical formulation of magnetization dynamicsin disordered binary alloys based on Kubo linear response theory interfacedwith the combination of seamlessly three approaches; density functional basedtight-binding linear muffin-tin orbitals, generalized recursion and Augmentedspace formalism. We apply this method to study the magnetization dynamics inchemically disordered Fe$_x$Co$_{1-x}$ ($x$ = 0.2, 0.5, 0.8) alloys. Wereported that the magnon energies decrease with an increase in Coconcentration. Significant magnon softening has been observed inFe$_{20}$Co$_{80}$ at the Brillouin zone boundary. The magnon-electronscattering increases with increasing Co content which in turn modifies thehybridization between the Fe and Co atoms. This reduces the exchange energybetween the atoms and soften down the magnon energy. The lowest magnon lifetimein found in Fe$_{50}$Co$_{50}$, where disorder is maximum. This clearlyindicates that the damping of magnon energies in Fe$_x$Co$_{1-x}$ is governedby the hybridization between Fe and Co whereas the magnon lifetime iscontrolled by disorder configuration. Our atomistic spin dynamics simulationsshow a reasonable agreement with our theoretical approach in magnon dispersionfor different alloy compositions.
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