Ion beam induced modification of exchange interaction and spin-orbit coupling in the Co$_2$FeSi Heusler compound
作者： J Hamrle , S Blomeier , O Gaier , B Hillebrands , H Schneider
DOI: 10.1088/0022-3727/40/6/S08
关键词: Heusler compound 、 Spin–orbit interaction 、 Coupling (probability) 、 Exchange interaction 、 Ion 、 Materials science 、 Coercivity 、 Irradiation 、 Condensed matter physics 、 Ion beam
摘要: A Co$_2$FeSi (CFS) film with L2$_1$ structure was irradiated different fluences of 30 keV Ga$^+$ ions. Structural modifications were subsequently studied using the longitudinal (LMOKE) and quadratic (QMOKE) magneto-optical Kerr effect. Both coercivity LMOKE amplitude found to show a similar behavior upon irradiation: they are nearly constant up ion $\approx6\times10^{15}$ ion/cm$^2$, while decrease further increasing finally vanish at fluence $\approx9\times10^{16}$ when sample becomes paramagnetic. However, contrary this behavior, QMOKE signal vanishes even for smallest applied $3\times10^{14}$ ion/cm$^2$. We attribute reduction an irradiation-induced degeneration second or higher order spin-orbit coupling, which already happens small On other hand, high is probably caused by exchange interaction within material.
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