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Hybridization of Surface and Impurity Spin Waves Induced by their Propagation in the Plane of a Thin Ferromagnetic Film

100%
Kołodziejczak B., Puszkarski H.
Acta Physica Polonica A
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1991
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vol. 80
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issue 5
675-687
EN
Spin waves of a thin ferromagnetic film containing in its bulk two impurity layers, each parallel to the film surface and symmetrically disposed with regard to the film centre, are theoretically investigated within the framework of the Heisenberg model. The existence conditions for surface-localized and impurity-layer localized spin waves are established. Particular attention is given to the effect of a possible hybridization of these localized excitations; it is shown that this phenomenon does in fact occur for certain specified directions of the in-plane wave vector k_{||}.
2
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Two-Dimensional Brillouin Zones in Thin Magnetic Films and a Mapping of the Regions of Existence of Magnetic Surface States

100%
Kołodziejczak B., Puszkarski H.
Acta Physica Polonica A
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1993
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vol. 83
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issue 5
661-676
EN
We consider the model of a thin ferromagnetic film, described by a standard Heisenberg Hamiltonian involving interactions between nearest neighbours. The surface inhomogeneities are introduced by means of "surface parameters" describing strictly the conditions at the surfaces. We consider the surface orientations SC(111) and FCC(111), for which we diagonalize the Hamiltonian by standard procedure obtaining the characteristic equation for the permitted eigenvalues (and eigenvectors perpendicular to the surface) versus the two-dimensional wave vector in the plane of the reciprocal lattice. It is found that the existence of a surface state (at fixed surface conditions) requires an appropriate propagation direction of the spin wave in the plane of the film. This requirement is visualized graphically by plotting the existence regions of the surface states in the two-dimensional Brillouin zone. These regions are studied as to their form and size versus the surface parameters. For the two surface orientations studied, the existence regions are found to be identical and hence they are not sensitive to the differences in cubic structure between SC and FCC.
3
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On the Magnon Spectrum of Antiferromagnetically Aligned Bilayer Films

71%
Puszkarski H., Kołodziejczak B., Akjouj A., Djafari-Rouhani B., Dobrzynski L.
Acta Physica Polonica A
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1993
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vol. 83
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issue 5
677-683
EN
We deal with spin-wave propagation in two antiferromagnetically aligned sublayers forming one bilayer film owing to the antiferromagnetic exchange coupling assumed to exist at the film interface. We get the following picture: as the spin wave traverses the interface, the creation of a spin-reversal in the one sublayer becomes an annihilation in the other sublayer. This feature is expressed by the non-conventional type of normalization condition of the spin-wave amplitudes.
4
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Brillouin Zone Mapping of the Existence Conditions for Interface Bilayer Spin-Waves. Effects of the Configuration of the Film Magnetization

61%
Puszkarski H., Józefowicz R., Kołodziejczak B., Akjouj A., Djafari-Rouhani B., Dobrzynski L.
Acta Physica Polonica A
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1996
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vol. 89
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issue 5-6
675-688
EN
For the two interface cubic cuts: sc(110) and sc(111) we consider the existence regions of interface spin-waves of a ferromagnetic bilayer film on the two-dimensional Brillouin zone as to their size and shape versus the respective interface related parameters (interface exchange coupling and intrinsic interface anisotropy) applying the approximation of a very thick bilayer film and the method of Brillouin zone mapping (the three (100) interface cubic orientations have been dealt with earlier [Phys. Rev. B 51, 16008 (1995)]). Of particular interest to us still remains the emergence of interface spin-waves induced by varying dynamic quantities such as the in-plane propagation wave vector k_{∥}. Moreover, in our present investigation, we put especial emphasis on the effect exerted on the Brillouin zone mapping by varying (in the plane perpendicular to the film) the configuration angle 𝜗 of the film magnetization with respect to the film normal. We predict the existence of (at the most two) critical angles 𝜗_{c} at which the interface spin-waves emerge. These critical angles are functions of the in-plane wave vector k_{∥} of interface spin-wave propagation along the interface. Finally, we discuss the effects due to the presence of critical angles with a view to their exploitation in experimental measurements.
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