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We study spin and spin-flavor oscillations of Dirac neutrinos in a planeelectromagnetic wave with circular polarization. The evolution of massiveneutrinos with nonzero magnetic moments in the field of an electromagnetic waveis based on the exact solution of the Dirac-Pauli equation. We formulate theinitial condition problem to describe spin-flavor oscillations in anelectromagnetic wave. The transition probabilities for spin and spin-flavoroscillations are obtained. In case of spin-flavor oscillations, we analyze thetransition and survival probabilities for different neutrino magnetic momentsand various channels of neutrino oscillations. As an application of theobtained results, we study the possibility of existence of$\nu_{e\mathrm{L}}\to\nu_{\mu\mathrm{R}}$ oscillations in an electromagneticwave emitted by a highly magnetized neutron star. Our results are compared withfindings of other authors.

Spin-flavor oscillations of Dirac neutrinos in a plane electromagnetic wave