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2 Acta Physica Polonica A

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Magnetic Anisotropy in (Ge,Mn)Te Layers

100%

Knoff W. , Łusakowski A. , Wołoś A. , Story T.

nr 2

404-406

Ferromagnetic resonance study of magnetic anisotropy is presented for thin layers of IV-VI diluted magnetic semiconductor (Ge,Mn)Te with Mn content of 12 and 21 at.% grown by molecular beam epitaxy on BaF₂ (111) substrates. The layers with low Mn content grow in the rhombohedral crystal structure and exhibit perpendicular magnetic anisotropy whereas the layers with Mn content higher than about 20 at.% are of cubic (rock-salt) structure and show regular easy-plane type magnetic anisotropy. The quantitative analysis of the angular dependence of the ferromagnetic resonant field is performed taking into account the magnetic energy contributions due to rhombohedral distortion (axial term along the (111) growth direction of the layer) and the crystal field terms allowed for ferromagnetic systems of rhombohedral symmetry.

Measurement of Very Small Zeeman Splittings in GaN:Mn,Mg by Faraday Rotation

63%

Wołoś A. , Kossacki P. , Golnik A. , Kamińska M. , Gaj J. , Twardowski A. , Grzegory I. , Boćkowski M. , Porowski S.

nr 4-5

695-699

In this work we demonstrate an application of Faraday rotation for measuring an extremely small Zeeman splitting of an Mn related absorption line placed at 1.417 eV in optical absorption spectrum of Mn and Mg doped gallium nitride. Analysis of the collected spectra allowed us to determine the value of the splitting as equal to 0.12±0.01 meV at 6 T. This data should help in establishing the nature of the observed absorption band.