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In this paper, we describe the unusual low-frequency magnetic resonances inalkali vapor with oriented atomic spins regarding the framework of densitymatrix formalism. The feature of the resonance is the absence of a constantcomponent in the external magnetic field. To explain steep increase of the spinorientation at certain frequencies, we define special closed atomic spintrajectories governed by periodic magnetic perturbation. Any closed trajectoryis characterized by the frequency of spin motion. The resonance effect wasnumerically verified in the paper. For instance, these trajectories can beobserved in an alkali vapor via optical excitation. Surprisingly, the width ofthe resonance line is found to be narrower, as one may expect.

Unusual spin effect in alkali vapor induced by two orthogonal multiple harmonics of magnetic field