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Isotropic effects in exchange-biased ferromagnetic /antiferromagnetic bilayers

Błachowicz T.

Materials Science Poland

2008

Vol. 26, No. 1

21--26

Novel, direction-independent (rotatable) spin-wave frequency modifications in a ferromagnetic layer biased by an antiferromagnetic film, revealed recently with Brillouin light scattering, have been analyzed. Physical conditions needed for the rotatable behaviour observations in epitaxial layers have been presented. The omni-rotatable down-shift, being a function of a spin-wave frequency, was distinguished from the up-shift of spin-wave frequencies induced by the exchange-bias. Additionally, the rotatable anisotropy constant was estimated from the available BLS results.

Different Magnetic-Anisotropy Fields in the Epitaxial Coo/Co(Hcp) Bilayer Investigated by Means of Light Scattering on Spin Waves

Błachowicz T.

Molecular and Quantum Acoustics

2006

Vol. 27

41-48

The magnetocrystalline and magnetoelastic anisotropies of epitaxial CoO/Co(hcp) bilayers with dominating (100) crystallographic in-plane orientation have been investigated by means of light scattering from spin waves. Analysis of spin-wave frequencies measured in different sample orientations enabled distinction of several anisotropy contribution to the sample energy density. The role of a demagnetizing factor, possible out-of-plane anisotropies and their influence on the in-plane anisotropies, including the magnetoelastic contribution, were discussed.

Computations of the Acoustic-Waves Propagation-Parameters and the Subsequent Elastic Constants Derivation in a Single Layer on a Substrate

Błachowicz T., Beghi M.

Molecular and Quantum Acoustics

2006

Vol. 27

49-61

The aim of this article is to present a phenomenon of acoustic waves propagation in a single layer on a semi-infinite substrate from the classical theory of elasticity point of view, and recall the description of this phenomenon by G. W. Farnell and E. L. Adler issued in 1972. Additionally, the purpose is to provide tutorial-type, step-by-step scheme for the numerical algorithm, using matrix formalism, in order to calculate frequencies, velocities and polarizations of different acoustic modes propagating within a layer. It was shown how from these calculations elastic constants of materials can be derived from fittings into dependencies between velocities and acoustic wave-vectors. The approach presented is related to Brillouin light scattering (BLS) experiments. The BLS experiments provide information about acoustic modes frequencies, velocities and wave-vectors, thus supporting the fitting procedure by reduction number of the unknown parameters.