One-dimensional magnetophotonic microcavity crystals with nongarnet dielectric mirrors are created and investigated. The defect layers in the magnetophotonic crystals are represented by two...

We report the experimental observation of multiple standing spin modes in a three-dimensional (3D) optomagnonic nanocavity formed by a nanometer-sized iron-garnet nanocylinder. We show that launching of the standing spin modes is achieved due to a high confinement of the optically generated effective magnetic field caused by the localized optical resonance. Quantization and spin-wave mode inhomogeneity are achieved in each of the three spatial dimensions. The presented approach opens horizons for 3D optomagnonics by combining nanophotonic and magnonic functionalities within a single nanocavity.

Ferrimagnets possess collinear and noncollinear magnetic phases. Here we identify a crucial influence of the magnetic phase on the excited spin modes. The spin dynamics is launched in a rare-earth iron garnet film by femtosecond laser pulses. The noncollinearity cardinally changes the behavior of spin mode frequencies: the high-frequency one becomes highly sensitive to the external magnetic field while the low-frequency one gets almost field insensitive and even drops with the field growth near the transition to the collinear phase. Near the magnetization compensation point the frequencies of these modes get close to equality.

The experimental discovery of the suppression effect of the non-collinear phase in strong magnetic fields near the compensation point in ferrimagnetic structures was made. The observations were carried out using the magneto-optical method by creating a lateral temperature gradient in the plane of the epitaxial films of iron garnets. The non-collinear phase is absent in weak magnetic fields. If an external magnetic field exceeds the first critical value, the non-collinear phase arises near the compensation point. The temperature range of the non-collinear phase expands due to the field increase up to the second critical value. Further field increases conversely reduce the temperature range of the non-collinear phase so that the field above the second critical value causes the disappearance of the non-collinear phase. The effect of the occurrence and suppression of the non-collinear phase is demonstrated on samples of two types of iron garnet films with two and three magnetic sublattices. Phase diagrams of the magnetic states in the vicinity of the critical point are constructed, and it is shown that the region of existence of the non-collinear phase in a two-sublattice magnet is smaller than in a three-sublattice one.

Here we theoretically and experimentally demonstrate a way to control the intensity of optical vortices by a magnetic field directed along the beam axis. We describe the principle of an optical vortex modulator and switch based on the Faraday effect in an iron garnet film. Importantly, the magnetic field influences only the polarization plane of the vortex and keeps its topological charge.