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2 Acta Physica Polonica A

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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.

Acta Physica Polonica A

2003

tom 103

nr 6

613-619

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.

Planar Hall Effect in Ferromagnetic (Ga,Mn)As/GaAs Superlattices

100%

Wesela W. , Wosiński T. , Mąkosa A. , Figielski T. , Sadowski J. , Terki F. , Charar S.

Acta Physica Polonica A

2007

tom 112

nr 2

369-373

The planar Hall effect was used for investigation of magnetic anisotropy in short period (Ga,Mn)As/GaAs superlattices epitaxially grown on (001) oriented GaAs substrate. The results confirmed the existence of low-temperature magnetocrystalline anisotropy in the superlattices with the easy magnetic axes directed along the two in-plane 〈100〉 directions. Attention is paid to the two-state behaviour of the planar Hall resistance at zero magnetic field that provides its usefulness for applications in non-volatile memory devices.