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3 Acta Physica Polonica A

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Temperature Dependence of Magnetization in Transition Metal Ultrathin Films of Various Thicknesses

100%

Świrkowicz R.

Acta Physica Polonica A

1991

tom 80

nr 5

689-697

Temperature dependence of the local magnetization in the spin-wave regime is calculated within the framework of the multiband model for ultrathin films consisting of 5, 7 and 9 monolayers. The temperature range in which the calculated results can be fitted to the Bloch T^{3/2} law is found in all cases. The Bloch coefficient Bay corresponding to temperature dependence of the average film magnetization is found to be proportional to 1/D, where D is the thickness of the film. The spatial distribution of the local magnetization is obtained. The Bloch coefficient corresponding to the surface layer appears to be greater than the one corresponding to the central layer, namely B_{s} > B_{c}. The ratio B_{s}/B_{c} is increasing with an increase of the film thickness. The calculated results are well consistent with experimental ones obtained for ultrathin films of various thicknesses.

Electronic Properties and Dynamic Susceptibility of MnTe Systems

63%

Wilczyński M. , Świrkowicz R.

nr 5

1048-1050

Thin MnTe films are investigated. Electronic structure, local density of states and local magnetic moments are calculated for systems with ferromagnetic and antiferromagnetic order. Spin-dependent modifications of the density of states near the surface are results of the changes in p-d hybridization. Magnetic longitudinal and dielectric susceptibilities are calculated.

Temperature Dependence of Raman Scattering by Magnons in Bulk-Like MBE-Gwn MnTe Films

32%

Szuszkiewicz W. , Mohrange J. , Jouanne M. , Kanehisa M. , Świrkowicz R. , Dynowska E. , Janik E. , Wojtowicz T. , Kossut J.

nr 5

1025-1028

Temperature dependence of the magnon frequency was studied for cubic MnTe epilayers by the Raman scattering measurements. Experimental data are compared to the results of theoretical calculations performed within the framework of the Heisenberg model using Green's function formalism.