E. A. Zhukov

Elastically induced mechanism of magnetization reversal in orthoferrites

In weak ferromagnets-orthoferrites in magnetic fields, which are considerably less than the spin-flop field, a new mechanism of magnetization reversal has been experimentally revealed. This is shown to be accompanied by the nonsteady motion of the domain wall whose velocities exceed the limiting velocity.

Magnetoelastic waves in yttrium orthoferrite plates

We have experimentally studied surface magnetoelastic waves in yttrium orthoferrite plates and discovered the phenomenon of energy pumping from the initial frequency (∼1 kHz) to higher harmonics (∼12.5 kHz).

Study of the structural and dimensional features of the magnetization reversal in transparent weak ferromagnets

The work id devoted to experimental investigation of the interrelation of magnetic growth inhomogeneities and dimensions of thin platelet samples with magnetoelastic interaction and nonlinearity of the dynamics of domain walls in fields that are substantially lower than the spin-flop field in weak ferromagnets (orthoferrites). It is shown that the excitation of elastic vibrations by a moving domain wall bears a resonance nature.

Retardation of a moving domain wall in weak ferromagnets

The retardation of a single domain wall in its motion at subsonic and supersonic velocities in YFeO3 and FeBO3 plates is investigated using the magneto-optical Faraday effect. The experimental results are discussed with due regard for the interaction of the magnetic and elastic subsystems of the crystal.

Diffraction of light by dynamic elastic deformations of a moving domain wall in orthoferrites on breaking through the sound barrier

Diffraction of light by dynamic deformations of a domain wall moving at the velocity of sound is observed in plates of rare-earth orthoferrites TmFeO3 and DyFeO3. In this case, the domain wall is shown to become bent across the thickness of the plate. The lifetime of the dynamic deformations is determined to be 20 ns, and their dimension is 2×10−4 cm. It is found that the polarization of light is altered and its change is comparable in magnitude to the Faraday rotation angle in the orthoferrites investigated.

Nonlinear magnetoacoustic interactions in weak ferromagnets

The pinning and interaction of a single domain wall with normal magnetoelastic waves excited during its motion in a single-crystal yttrium orthoferrite plate, were discovered and investigated by a method based on the magneto-optical Faraday effect. The dependences of the bending wave amplitude and the spectra of shear waves, which can be excited by a moving domain wall, were calculated. The results obtained are interpreted with allowance for the interactions of excited oscillations in both the magnetic and elastic subsystems of the orthoferrite.