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A low-energy magnetic dipole $(M1)$ spin-scissors resonance (SSR) locatedjust below the ordinary orbital scissors resonance (OSR) was recently predictedin deformed nuclei within the Wigner Function Moments (WFM) approach. Weanalyze this prediction using fully self-consistent Skyrme Quasiparticle RandomPhase Approximation (QRPA) method. Skyrme forces SkM*, SVbas and SG2 areimplemented to explore SSR and OSR in $^{160,162,164}$Dy and $^{232}$Th.Accuracy of the method is justified by a good description of M1 spin-flip giantresonance. The calculations show that isotopes $^{160,162,164}$Dy indeed haveat 1.5-2.4 MeV (below OSR) $I^{\pi}K=1^+1$ states with a large $M1$ spinstrength ($K$ is the projection of the total nuclear moment to the symmetryz-axis). These states are almost fully exhausted by $pp[411\uparrow,411\downarrow]$ and $nn[521\uparrow, 521\downarrow]$ spin-flip configurationscorresponding to $pp[2d_{3/2}, 2d_{5/2}]$ and $nn[2f_{5/2}, 2f_{7/2}]$structures in the spherical limit. So the predicted SSR is actually reduced tolow-orbital (l=2,3) spin-flip states. Following our analysis and incontradiction with WFM spin-scissors picture, deformation is not the principleorigin of the low-energy spin $M1$ states but only a factor affecting theirfeatures. The spin and orbital strengths are generally mixed and exhibit theinterference: weak destructive in SSR range and strong constructive in OSRrange. In $^{232}$Th, the $M1$ spin strength is found very small. Two groups of$I^{\pi}=1^+$ states observed experimentally at 2.4-4 MeV in $^{160,162,164}$Dyand at 2-4 MeV in $^{232}$Th are mainly explained by fragmentation of theorbital strength. Distributions of nuclear currents in QRPA states partlycorrespond to the isovector orbital-scissors flow but not to spin-scissors one.

Microscopic analysis of low-energy spin and orbital magnetic dipole excitations in deformed nuclei