arXiv subjects

V. V. Nietz

Publications and source records attributed to V. V. Nietz.

3 recordsLinked to original sources

arXiv2010

Precessing ball solitons in kinetics of a spin-flop phase transition

The fundamentals of precessing ball solitons (PBS), arising as a result of the energy fluctuations during spin-flop phase transition induced by a magnetic field in antiferromagnets with uniaxial anisotropy, are presented. The PBS conditions exist within a wide range of amplitudes and energies, including negative energies relative to an initial condition. For each value of the magnetic field, there exists a precession frequency for which a curve of PBS energy passes through a zero value (bifurcation point), and hence, in the vicinity of this point the PBS originate with the highest probability. The characteristics of PBS, including the time dependences of configuration, energy, and precession frequency, are considered. As a result of dissipation, the PBS transform into the macroscopic domains of a new phase.

cond-mat.mtrl-sci↗

arXiv2010

Precessing equilibrium and overcritical solitons at a spin-flop transition

Taking into account the energy dissipation in the spin-flop phase transition induced by magnetic field in an antiferromagnet with uni-axial anisotropy, the following peculiarities of precessing ball solitons (PBS) are considered: a) the states of equilibrium precessing solitons arising in the initial phase during the phase transition; b) the states of "overcritical PBS" existing outside the region of metastability. The "overcritical" PBS may originate during disintegration of the initial phase.

cond-mat.other↗

arXiv2010

Kinetics of precessing ball solitons in ferromagnet at the first-order transition

The fundamentals of precessing ball solitons (PBS) arising as a result of the energy fluctuations at the first-order phase transition induced by a magnetic field in ferromagnets with uniaxial anisotropy are presented. When external magnetic field is anti-parallel to the magnetization direction of the crystal, PBS states are possible in a wide range of amplitudes and energies, including the positive and negative energy relative to an initial condition. PBS are born with the greatest probability at near-zero energy, i.e. near the bifurcation point. Evolution of the PBS, at which they transform into macroscopic domains of a new magnetic phase or into quasi-equilibrium solitonic state, is analyzed.

cond-mat.other↗