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Magnetic and Structural Studies of GeMnSnTe Epitaxial Layers

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Grochot A., Knoff W., Taliashvili B., Wołkanowicz W., Minikayev R., Pieniążek A., Łusakowska E., Sawicki M., Jantsch W., Story T., Przybylińska H.

Acta Physica Polonica A

2017

vol. 132

issue 2

340-342

MBE grown Ge_{1-x-y}Mn_xSn_yTe layers with Mn content ranging from 10 to 30% and Sn content ranging from 2 to 5% have been characterized with X-ray diffraction, energy-dispersive X-Ray spectroscopy, atomic force microscopy, SQUID magnetometry, and ferromagnetic resonance. All layers (except the one with the highest Mn and Sn content) were found to be single phase rhombohedral, with the distortion axis perpendicular to the layer surface, and ferromagnetic. Ferromagnetic resonance studies have shown that co-doping with a few percent of tin makes the lattice more rigid and changes considerably the magnetocrystalline anisotropy, from purely uniaxial in GeMnTe to distorted cubic in Ge_{1-x-y}Mn_xSn_yTe at the same Mn content.

Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects

100%

Popovych V. D., Kuzma M., Skop N., Stefaniuk I., Cieniek B.

Acta Physica Polonica A

2017

vol. 132

issue 1

34-38

We study CdTe:Cr single crystals grown by the physical vapor transport method from pre-synthesized (Cd,Cr)Te alloys with 5 at.% of chromium nominal content. Macrodefects in the form of (111)-oriented thin platelets of dopant-related second phases were detected by scanning electron microscopy patterning of the chemically treated surfaces of the crystals. Magnetic properties of the crystals were investigated by ferromagnetic resonance using X-band Bruker spectrometer (9.43 GHz). Their ferromagnetic resonance spectra show several broad lines, which position depends on the orientation of the sample in relation to the external magnetic field in spectrometer. The angular dependences of ferromagnetic resonance spectra are interpreted in the frame of shape anisotropy of ferromagnetic resonance of the planar defects embedded in a weak magnetic CdTe matrix.

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2 Acta Physica Polonica A

2 2017

1 Cieniek B.

1 Grochot A.

1 Jantsch W.

1 Knoff W.

1 Kuzma M.

1 Minikayev R.

1 Pieniążek A.

1 Popovych V. D.

1 Przybylińska H.

1 Sawicki M.

1 Skop N.

1 Stefaniuk I.

1 Story T.

1 Taliashvili B.

1 Wołkanowicz W.

1 Łusakowska E.

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Magnetic and Structural Studies of GeMnSnTe Epitaxial Layers

Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects