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3 Acta Physica Polonica A

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Oscillating Antiferromagnetism of Ultrathin EuTe Layers

100%

Wilamowski Z. , Springholz G. , Svrcek V. , Jantsch W.

Acta Physica Polonica A

1997

tom 92

nr 5

1051-1054

We study magnetic resonance on EuTe/PbTe superlattices. Analysis of the magnetic dipole anisotropy in the superlattices and of the EPR amplitude of isolated Eu ions in the PbTe wells shows that the diffusion at interfaces is very small. The real thickness of EuTe can be evaluated with an accuracy better than one monolayer. Since for EuTe layers thicker than 2 monolayers there is no difference in the character of the antiferromagnetic resonance observed for even and odd numbers of monolayers, we conclude that there is no static magnetization of the antiferromagnetic sublattices. Nevertheless, long range antiferromagnetic order is clearly evident.

Magnetic Properties of Semiconductor-Antiferromagnet Superlattices

88%

Wilamowski Z. , Buczko R. , Jantsch W. , Ludwig M. , Springholz G.

Acta Physica Polonica A

1996

tom 90

nr 5

973-976

Magnetic resonance investigations of ultra-thin antiferromagnetic EuTe layers show a specific behaviour in the quasi-2D antiferromagnetic ordering: (i) an anisotropy of the critical broadening, (ii) a substantial increase in the Néel temperature and (iii) an anisotropic shift of the resonance frequency which diverges at the Néel point. The results show that exchange coupling is stronger in quasi-2D than in 3D antiferromagnetic samples and that correlation of spin chains aligned in the perpendicular direction occurs already well above the Néel point.

Second Harmonic Generation in Spin-Glass Microstructures and Fabrication of Microstructures in IV-VI Epilayers

51%

Grabecki G. , Dietl T. , Cieplak M. , Plesiewicz W. , Lenard A. , Skośkiewicz T. , Kamińska E. , Piotrowska A. , Żarecka R. , Springholz G. , Bauer G.

Acta Physica Polonica A

1993

tom 84

nr 4

781-784

We studied magnetoconductance of two different mesoscopic systems: microregions containing two-dimensional electron gas adjacent to a grain-boundary plane in bicrystals of Hg_{0.79}Cd_{0.19}Mn_{0.02}Te and photolithographically patterned microstructures of Pb_{1-x}Mn_{x}Se. In both systems universal conductance fluctuations and generation of the second-harmonic voltage were observed at T ≤ 1 K. Moreover, in the former system the second harmonic signal exhibited distinct rise when the sample was cooled below the spin-glass freezing temperature (100 mK).