Optical Characterization of MBE-Grown Cd<sub>1-x</sub>Mn<sub>x</sub>Te Layers by Raman Spectroscopy

Szuszkiewicz, W.; Dynowska, E.; Janik, E.; Karczewski, G.; Wójtowicz, T.; Kossut, J.; Jouanne, M.

doi:10.12693/aphyspola.89.335

Acta Phys. Pol. A

1996

DOI: 10.12693/aphyspola.89.335

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Optical Characterization of MBE-Grown Cd_1-xMn_xTe Layers by Raman Spectroscopy

W. Szuszkiewicz

E. Dynowska

E. Janik

et al.

Abstract: In this paper we discuss a possibility of an optical characterization of thin semiconductor epilayers by Raman scattering measurements. As an example zinc blende Cd1-xMnxΤe epilayers (0.66 < x < 1.0) have been grown by molecular beam epitaxy method and investigated by Raman scattering and X-ray diffraction. Information resulting from both methods is compared and discussed.

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Cited by 7 publications

(18 citation statements)

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“…2). One-magnon structures found at the Raman spectra taken for these compounds at low temperatures can be compared with the earlier Raman scattering data obtained for MnTe and Cd 1 -x Mnx Te layers [5,6]. The observed composition dependence of the magnon frequency is quite similar in all three diluted AFIII systems.…”

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confidence: 56%

Magnons in Cubic MBE-Grown A_1-xMn_xTe Layers (A = Cd, Zn, Mg)

et al. 1998

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One-magnon excitations in MBE-grown A1 ΜnΤe layers (where A = Cd, Zn, Mg and x > 0.7) were investigated by means of the Raman scattering measurements at low temperatures (,^s 20 K). The composition dependence of the anisotropy energy -as extracted from these measurements -is discussed. Further, the elastic neutron scattering measurements were performed in layers of cubic MnTe, which constitute the end point material of the ternary alloys series. Abundance of variously oriented antiferromagnetic domains in MnTe layers as a function of temperature was studied. We confirm occurrence of a pronounced magnetostriction effect. magnetic semiconducting alloys Mg1-x Μnx Te, with both constituent binaries that do not crystallise normally in the cubic form, were also grown by MBE. The interesting aspect of these new possibilities introduced by MBE is that, as it is known, zinc blende Mn chalcogenides constitute unique cases of fcc Heisenberg spin systems with strongly dominating antiferromagnetic nearest-neighbour interactions (resulting in AFIII antiferromagnetic phase -see, e.g., [1,2]). Therefore, they can be used as model systems for studies of magnetic properties and interactions to be confronted with existing theoretical predictions.* Crystal growth was supported in part by PBZ 28.11 grant from the Committee for ScientificResearch (Poland). tLaboratoire commun CEA-CNRS.(583)

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confidence: 56%

Magnons in Cubic MBE-Grown A_1-xMn_xTe Layers (A = Cd, Zn, Mg)

et al. 1998

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“…Such analysis at room temperature was previously performed on our samples and the results of these studies can be found in Ref. [3]. On the other hand, the structures observed in the -z(x, y)z polarization were previously not observed and we shall concentrate on discussion concerning possible physical mechanism responsible for this scattering.…”

mentioning

confidence: 69%

“…Magnetic excitations (magnons) were observed in the z(x, y)z polarization for thick layers of cubic MnTe at about 34 cm -1 at low temperatures [2]. The structures in the multilayer spectra are seen in the same polarization and, also, disappear at temperatures close to the Néel temperature in the bulk cubic MnTe.…”

mentioning

confidence: 91%

“…As the non-magnetic spacers, thin layers of CdTe were used. The lattice parameter values for both compounds do not differ too much (the lattice mismatch is close to above 2%) so the strain effects are expected to be insignificaut.Recently, it was demonstrated that the Raman scattering is a very effective tool for investigation of magnetic excitations (magnons) in thick, MBE-grown MnTe [2]. In order to make the Raman scattering intensity measurable, we used multilayers with thin MnTe layers having a constant thickness separated by 12 monolayers of nonmagnetic CdTe.…”

mentioning

confidence: 99%

“…Recently, it was demonstrated that the Raman scattering is a very effective tool for investigation of magnetic excitations (magnons) in thick, MBE-grown MnTe [2]. In order to make the Raman scattering intensity measurable, we used multilayers with thin MnTe layers having a constant thickness separated by 12 monolayers of nonmagnetic CdTe.…”

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confidence: 99%

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Raman Characterization of MBE-Grown Layered MnTe/CdTe Structures

et al. 1997

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Raman scattering measurements on (MnTe)8 /(Cd 0.64 Ζn 0.30Τc)8 multilayer grown by MBE method and on various (MnTe)n/(CdTe)ι2 multilayers (where n = 8,12,16, 24) were performed at low temperatures. In the The objective of this work is to analyse the Raman scattering in superlattices (multilayers) involving thin films of a magnetic semiconductor separated by a non-magnetic spacer. Zinc-blende MnTe (which in a bulk form possesses a long-range antiferromagnetic order of the AF-III type, see, e.g., [1]) was selected as a suitable material for the magnetically active component. As the non-magnetic spacers, thin layers of CdTe were used. The lattice parameter values for both compounds do not differ too much (the lattice mismatch is close to above 2%) so the strain effects are expected to be insignificaut.Recently, it was demonstrated that the Raman scattering is a very effective tool for investigation of magnetic excitations (magnons) in thick, MBE-grown MnTe [2]. In order to make the Raman scattering intensity measurable, we used multilayers with thin MnTe layers having a constant thickness separated by 12 monolayers of nonmagnetic CdTe. Thus according to the recent neutron scattering *This work has been partially supported by PB750/T0S/95/09 grant from the Committee for Scientiflc Research (Poland). †Permanent address:

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Néel temperature of zinc‐blende, MBE‐grown MnTe layers: modification by the crystal growth conditions

Szuszkiewicz

Dynowska

Domagała

et al. 2004

phys. stat. sol. (c)

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We present evidence of the influence of the substrate (GaAs and CdZnTe) on the magnetic properties and on the surface structure of (001) zinc-blende MnTe grown by molecular beam epitaxy. High-resolution Xray diffraction and atomic force microscopy were employed in the characterisation of the MnTe structure. The temperature dependence of collective spin excitations (magnons) was determined via Raman scattering and subsequently analysed in order to study selected magnetic properties. Differences in both the Néel temperature and magneto-elastic coupling between the MnTe layer and the given substrate were demonstrated, and mechanisms contributing to these effects are discussed.1 Introduction The preparation method of thin semiconductor layers as well as their mechanical parameters can influence various properties, including their magnetic characteristics. In particular, this phenomenon is well known for insulating ferromagnets which crystallize in the rock salt structure (e.g., europium chalcogenides). An important enhancement of the Curie temperature of undoped EuS epitaxial films, depending on the growth conditions, has been observed in Ref. [1]. As has been demonstrated, this effect is associated with indirect exchange through additional charge carriers that were created in the film due to non-stoichiometry caused by dislocations. Recently, the influence of the substrate (via strain effects) on the Curie temperature of EuS/PbS multilayers was also observed in Ref. [2]. This effect was attributed to stress resulting mainly from the difference of thermal expansion coefficients between the substrate and the structure. In addition, for extremely thin EuS layers -below 10 monolayers (ML) -a systematic reduction of the phase transition temperature with decreasing EuS layer thickness was observed. The phenomena described above are less well known in other groups of magnetic (or diluted magnetic) semiconductors, e.g., II-VI or III-V based materials. In particular, to our knowledge such data do not exist for crystals which, at low temperature, are antiferromagnets. Zinc-blende MnTe (for which the Néel temperature T N is about 65 K) is a good representative of this group of materials. Due to its metastable character, MnTe in this crystal phase can be obtained only by non-equilibrium growth techniques, e.g., molecular beam epitaxy (MBE). The goal of the present work was to demonstrate a relationship between the surface structure and magnetic properties of zinc-blende MnTe layers.

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Optical Characterization of MBE-Grown Cd_1-xMn_xTe Layers by Raman Spectroscopy

Cited by 7 publications

References 13 publications

Magnons in Cubic MBE-Grown A_1-xMn_xTe Layers (A = Cd, Zn, Mg)

Magnons in Cubic MBE-Grown A_1-xMn_xTe Layers (A = Cd, Zn, Mg)

Raman Characterization of MBE-Grown Layered MnTe/CdTe Structures

Néel temperature of zinc‐blende, MBE‐grown MnTe layers: modification by the crystal growth conditions

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Optical Characterization of MBE-Grown Cd1-xMnxTe Layers by Raman Spectroscopy

Cited by 7 publications

References 13 publications

Magnons in Cubic MBE-Grown A1-xMnxTe Layers (A = Cd, Zn, Mg)

Magnons in Cubic MBE-Grown A1-xMnxTe Layers (A = Cd, Zn, Mg)

Raman Characterization of MBE-Grown Layered MnTe/CdTe Structures

Néel temperature of zinc‐blende, MBE‐grown MnTe layers: modification by the crystal growth conditions

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Product

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Optical Characterization of MBE-Grown Cd_1-xMn_xTe Layers by Raman Spectroscopy

Magnons in Cubic MBE-Grown A_1-xMn_xTe Layers (A = Cd, Zn, Mg)

Magnons in Cubic MBE-Grown A_1-xMn_xTe Layers (A = Cd, Zn, Mg)