CC BY 3.0 UnportedAyuso, DavidJiménez-Galán, AlvaroMorales, FelipeIvanov, MishaSmirnova, Olga2023-01-052023-01-052017-07-07https://oa.tib.eu/renate/handle/123456789/10774http://dx.doi.org/10.34657/9800Tunnel ionization of noble gas atoms driven by a strong circularly polarized laser field in combination with a counter-rotating second harmonic generates spin-polarized electrons correlated to the spin-polarized ionic core. Crucially, such two-color field can bring the spin-polarized electrons back to the parent ion, enabling the scattering of the spin-polarized electron on the spin-polarized parent ion. Here we show how one can control the degree of spin polarization as a function of electron energy and recollision time by tuning the laser parameters, such as the relative intensities of the counter-rotating fields. The attosecond precision of the control over the degree of spin polarization opens the door for attosecond control and spectroscopy of spin-resolved dynamics.enghttps://creativecommons.org/licenses/by/3.0/530attosecond physicselectronion recollisionspin polarizationstrong laser fieldsArticle