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Magnetic Properties of GaMnAs Single Layers and GaInMnAs Superlattices Investigated at Low Temperature and High Magnetic Field

100%

Hernandez C., Terki F., Charar S., Sadowski J., Maude D., Stanciu V., Svedlindh P.

Magnetotransport properties of GaMnAs single layers and InGaMnAs/InGaAs superlattice structures were investigated at temperatures from 4 K to 300 K and magnetic fields up to 23 T to study the influence of carriers confinement through different structures. Both single layers and superlattice structures show paramagnetic-to-ferromagnetic phase transition. In GaMnAs/InGaAs superlattice beside the Curie temperature (T_c≈40 K), a new phase transition is observed close to 13 K.

Magnetic Properties of Short Period InGaMnAs/InGaAs Superlattices

100%

Sadowski J., Mathieu R., Svedlindh P., Kanski J., Karlsteen M., Świątek K., Domagała J.

issue 4-5

687-694

We have observed a paramagnetic-to-ferromagnetic phase transition in short period InGaMnAs/InGaAs superlattices. The thicknesses of magnetic InGaMnAs layers in the structures studied was chosen to be 4 or 8 molecular layers (12Å or 24Å). The non-magnetic InGaAs spacer layers are 12Å thick. The composition (In content) in InGaMnAs and InGaAs was chosen in such a way that magnetic layers were: deep potential wells, high potential barriers, or shallow potential wells. For superlattices with 8 monolayer thick InGaMnAs magnetic layers and 4 monolayer thick InGaAs non-magnetic spacers the temperatures of paramagnetic-to-ferromagnetic phase transition do not depend on the band offsets between InGaMnAs and InGaAs adjusted by the In content.

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2 Acta Physica Polonica A

1 2003

1 2002

2 Sadowski J.

2 Svedlindh P.

1 Charar S.

1 Domagała J.

1 Hernandez C.

1 Kanski J.

1 Karlsteen M.

1 Mathieu R.

1 Maude D.

1 Stanciu V.

1 Terki F.

1 Świątek K.

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Magnetic Properties of GaMnAs Single Layers and GaInMnAs Superlattices Investigated at Low Temperature and High Magnetic Field

Magnetic Properties of Short Period InGaMnAs/InGaAs Superlattices