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X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn_{1-x}Co_{x}S Diluted Magnetic Semiconductor Crystals

100%

Ławniczak-Jabłońska K., Gołacki Z., Paszkowicz W., Iwanowski R., Johansson L., Heinonen M.

Acta Physica Polonica A

1993

vol. 84

issue 4

633-636

X-ray photoelectron spectroscopy and powder X-ray diffraction studies of diluted magnetic semiconducting alloys Zn_{1-x}Co_{x}S, in the composition range 0 ≤ x ≤ 0.18, were performed. The analysis of XPS spectra has shown that admixture of Co into ZnS lattice does not affect the shape and position of Zn 2p core level, whereas certain modification of the S 2p peak shape was observed. The detected binding energy of Co indicated similarity between Co-S and Co-O bond structure. Significant contributions of Co 3d^{7} electrons to the valence band density of states were revealed.

MnAs Overlayer on GaN(000_1)-(1 x 1) - Its Growth, Morphology and Electronic Structure

84%

Kowalski B., Kowalik I., Iwanowski R., Łusakowska E., Sawicki M., Sadowski J., Grzegory I., Porowski S.

Acta Physica Polonica A

2004

vol. 105

issue 6

645-650

MnAs layer has been grown by means of MBE on the GaN(000_1)-(1 x 1) surface. Spontaneous formation of MnAs grains with a diameter of 30-60 nm (as observed by atomic force microscopy) occurred for the layer thickness bigger than 7 ML. Ferromagnetic properties of the layer with Curie temperature higher than 330 K were detected by SQUID measurements. Electronic structure of the system was investigated in situ by resonant photoemission spectroscopy for MnAs layer thickness of 1, 2, and 8 ML. Density of the valence band states of MnAs and its changes due to the increase in the layer thickness were revealed.

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2 Acta Physica Polonica A

1 2004

1 1993

2 Iwanowski R.

1 Gołacki Z.

1 Grzegory I.

1 Heinonen M.

1 Johansson L.

1 Kowalik I.

1 Kowalski B.

1 Paszkowicz W.

1 Porowski S.

1 Sadowski J.

1 Sawicki M.

1 Ławniczak-Jabłońska K.

1 Łusakowska E.

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X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn_{1-x}Co_{x}S Diluted Magnetic Semiconductor Crystals

MnAs Overlayer on GaN(000_1)-(1 x 1) - Its Growth, Morphology and Electronic Structure