Abstract.A local flexomagnetoelectric ) effect in the magnetic domain walls (DWs) of the cubic hexoctahedral crystal has been investigated on the basis of a symmetry analysis.The strong connection between magnetic symmetry of the DW and the type of the distribution of the electric polarization was shown. Results were systemized in the scope of the DW chirality. It was shown, that new type of the local flexomagnetoelectric coupling can be experimentally detected using the external homogeneous electric field.
Abstract.Investigations of the phase transitions and self-organization in the magnetic aggregates are of the fundamental and applied interest. The long-range ordering structures described in the Tománek's systematization (M. Yoon, and D. Tománek, 2010 [1]) are not yet obtained in the direct molecular dynamics simulations. The resulted structures usually are the linear chains or circles, or, else, amorphous (liquid) formations. In the present work, it was shown, that the thermodynamically equilibrium primary ferrofluid aggregate has either the long-range ordered or liquid phase. Due to the unknown steric layer force and other model idealizations, the clear experimental verification of the real equilibrium phase is still required. The predicted long-range ordered (crystallized) phase produces the faceting shape of the primary ferrofluid aggregate, which can be recognized experimentally. The medical (antiviral) application of the crystallized aggregates has been suggested. Dynamic formation of all observed ferrofluid nanostructures conforms to the Tománek's systematization.
Effects of pulse magnetic field on the optical transmission properties of
thin ferrofluid (FF) layers were experimentally investigated. It was observed
that, under an influence of an external uniform magnetic field, pulses applied
to the samples surfaces in normal direction decrease the optical transmission
with further returning it to its original state, even before the end of the
field pulse. The dependencies of the observed effects on the magnetic pulse
magnitude and the samples thickness were investigated. The experimental results
are explained using FF columnar aggregates growth and lateral coalescence under
influence of a magnetic field, leading to a light scattering type
Rayleigh-to-Mie transition. Further evolution of this process comes to a
geometrical optics scale and respective macroscopic observable opaque FF
columnar aggregates emergence. These changes of optical transmission are
non-monotonic during the magnetic field pulse duration with minimal value in
the case of Mie scattering, which is known as a magneto-optical extinction
trend inversion. The residual inversion was detected after the external
magnetic field pulse falling edge. Using molecular dynamics simulation, we
showed that a homogeneous external magnetic field is enough for the formation
of columnar aggregates and their fusion. The results clarify the known Li
theory (Li et al., J. Phys. D: Appl. Phys. 37 (2004) 3357, and Sci. Technol.
Adv. Mate. 8 (2007) 448), implying an inhomogeneous field as a required
prerequisite for the magneto-optical extinction trend inversion phenomenon
Magnetic symmetry of possible plane domain walls in arbitrary oriented plates of the crystal of hexoctahedral crystallographic class is considered. The symmetry classification is applied for ferro-and ferrimagnets.
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