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A Co$_2$FeSi (CFS) film with L2$_1$ structure was irradiated with differentfluences of 30 keV Ga$^+$ ions. Structural modifications were subsequentlystudied using the longitudinal (LMOKE) and quadratic (QMOKE) magneto-opticalKerr effect. Both the coercivity and the LMOKE amplitude were found to show asimilar behavior upon irradiation: they are nearly constant up to ion fluencesof $\approx6\times10^{15}$ ion/cm$^2$, while they decrease with furtherincreasing fluences and finally vanish at a fluence of $\approx9\times10^{16}$ion/cm$^2$, when the sample becomes paramagnetic. However, contrary to thisbehavior, the QMOKE signal nearly vanishes even for the smallest appliedfluence of $3\times10^{14}$ ion/cm$^2$. We attribute this reduction of theQMOKE signal to an irradiation-induced degeneration of second or higher orderspin-orbit coupling, which already happens at small fluences of 30 keV Ga$^+$ions. On the other hand, the reduction of coercivity and LMOKE signal with highion fluences is probably caused by a reduction of the exchange interactionwithin the film material

Ion beam induced modification of exchange interaction and spin–orbit coupling in the Co2FeSi Heusler compound

Ion beam induced modification of exchange interaction and spin–orbit coupling in the Co₂FeSi Heusler compound