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Helical Spin Structures in c-Axis Dy/Y Superlattice

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Seroczyńska M., Kociński J.

Acta Physica Polonica A

1996

vol. 89

issue 1

99-104

On the basis of Landau's theory of symmetry changes at continuous phase transitions, we have derived the formulae for two incommensurate helical spin structures which are symmetry allowed in Dy/Y superlattice, when the helical axis is parallel to the c-axis of the hexagonal lattice. These structures have different extinction coefficients in their cross-sections for magnetic scattering of neutrons and therefore can be distinguished by experiment. Magnetic satellite peaks around the reciprocal lattice points K + 0 are allowed for only one of these spin structures, namely that inferred from earlier experiments.

Intensity and Polarisation Bistability in Two Primary-Wave Mixing in Media with Second-Order Nonlinearity

100%

Seroczyńska M., Zagórski A.

Acta Physica Polonica A

2001

vol. 99

issue 6

655-663

In this paper we analyse theoretically the transmission of two strong laser beams through a medium exhibiting optical nonlinearity of the second order combined with a linear anisotropy. A standard model of two wave mixing was applied and closed formulas for intensity and polarisation state were obtained. Numerical calculations show that outgoing beams are very sensitive to the state of incoming beams and to the material characteristics. Under some realistic conditions we were able to obtain bistability of both intensity and polarisation state. The results also show how to modulate the intensity and polarisation state of one wave by another one.

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2 Acta Physica Polonica A

1 2001

1 1996

2 Seroczyńska M.

1 Kociński J.

1 Zagórski A.

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Helical Spin Structures in c-Axis Dy/Y Superlattice

Intensity and Polarisation Bistability in Two Primary-Wave Mixing in Media with Second-Order Nonlinearity