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3 Acta Physica Polonica A

3 1995

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Ferromagnetic Behavior of a Short Period Antiferromagnetic Superlattice

100%

Wilamowski Ż. , Jantsch W. , Faschinger W.

Acta Physica Polonica A

1995

tom 87

nr 1

185-188

We present a study of short period MnTe/CdTe superlattices by magnetic resonance. The usually antiferromagnetic structure exhibits critical line broadening above the Néel temperature typical of antiferromagnetic ordering, but also some ferromagnetic properties at lower temperature. We suggest that the observed ferromagnetic-like moment originates from coupling of the moments of the recently proposed strong magnetic polarons.

Mechanisms of Nonuniform Line Broadening

100%

Wilamowski Ż. , Przybylińska H. , Jantsch W.

Acta Physica Polonica A

1995

tom 87

nr 1

181-184

When the spin relaxation time of paramagnetic impurities at different magnetic sites differs by orders of magnitude then instead of resonance line broadening, rather a decay of the line amplitude is expected. In particular, the sp-d coupling of magnetic impurities to shallow impurities leads to a nonuniform distribution of the longitudinal relaxation rates of local spins.

PbSe:Cr - New Resonant Donor System

75%

Story T. , Wilamowski Ż. , Grodzicka E. , Dobrowolski W. , Witkowska B. , Voiron J.

Acta Physica Polonica A

1995

tom 87

nr 1

229-232

Hall effect, conductivity, electron paramagnetic resonance and magnetization of Pb_{1-x}Cr_{x}Se (x ≤ 0.01) crystals were measured as a function of Cr content and electron concentration. The experimental results suggest that Cr in PbSe creates a resonant donor state with the energy of about 125 meV above the bottom of the conduction band.