Magnetic Properties of EuS-SrS Semiconductor Multilayer Structures

Szot, M.; Kowalczyk, L.; Deptuła, P.; Domukhovski, V.; Osinniy, V.; Smajek, E.; Szczerbakow, A.; Sipatov, A. Yu.; Volobuev, Valentine V.; Fedorov, Andrei G.; Story, T.

doi:10.12693/aphyspola.112.419

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…at temperature close to the Curie temperature of bulk EuS. Such behavior was already observed in the case of previously studied magnetically coupled EuS/PbS [9,10] and EuS/SrS [11] multilayers and can be interpreted as a result of antiferromagnetic alignment of magnetization vectors of Co and EuS layers. Figure 3 shows the results of the measurements of the temperature dependence of magnetization M (T ) carried out for EuS/Co/EuS trilayer.…”

Section: Methodssupporting

confidence: 74%

Magnetic Properties of EuS/Co Multilayers on KCl and BaF₂ Substrates

et al. 2008

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Magnetic and structural properties of EuS/Co multilayers were studied by magnetic optical Kerr effect and SQUID magnetometry techniques and by X-ray diffraction method. The multilayers containing monocrystalline, ferromagnetic EuS layer (thickness 35-55Å) and metallic Co layer (thickness 40-250Å), were grown on KCl (001) and BaF2 (111) substrates using high vacuum deposition technique employing electron guns for Co and EuS. All investigated EuS/Co multilayers exhibit ferromagnetic properties at room temperature due to Co layer with the ferromagnetic transition in EuS layer clearly marked upon cooling below 16 K. In EuS/Co/EuS trilayers grown on KCl substrate the antiferromagnetic alignment of magnetization vectors of Co and EuS layers was experimentally observed as a characteristic low field plateau on magnetization hysteresis loops and a decrease in multilayer magnetization below 16 K. In Co/EuS bilayers the characteristic temperature dependent shift of magnetization loops was found due to exchange bias effect attributed to the CoO/Co interface formed by the oxidation of the top Co layer.

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Section: Methodssupporting

confidence: 74%

Magnetic Properties of EuS/Co Multilayers on KCl and BaF₂ Substrates

et al. 2008

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“…It should be noted, however, that EuS/SrS is a special case of a superlattice system- namely, due to the very small nuclear scattering contrast between EuS and SrS layers (nuclear scattering lengths of Eu and Sr are 7.22-1.26i fm and 7.02 fm, respectively) the structural SL Bragg peaks are extremely weak and they are not visible against the background in neutron reflectivity spectra (they can be seen only in x-ray reflectivity spectra, and from such measurements one can accurately determine their positions). Magnetic and structural properties of EuS/SrS semiconductor multilayers were studied earlier by SQUID, magneto-optical Kerr effect magnetometry and x-ray diffraction methods [7].…”

Section: Eus/srs Superlatticesmentioning

confidence: 99%

Interlayer coupling in EuS/SrS, EuS/PbSe and EuS/PbTe magnetic semiconductor superlattices

Kępa

Majkrzak

Sipatov

et al. 2009

J. Phys.: Condens. Matter

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Neutron reflectivity studies of EuS/SrS, EuS/PbSe and EuS/PbTe all-semiconductor superlattices were carried out in a search for exchange interlayer coupling. A relatively weak antiferromagnetic coupling was found in EuS/SrS and EuS/PbSe systems but no interlayer coupling was detected in EuS/PbTe superlattices. In EuS/SrS, where the SrS spacer is an insulator (E(g)≈4 eV), a very weak and short range interlayer coupling is in agreement with the earlier theoretical predictions that the interlayer coupling strength in EuS-based magnetic semiconductor superlattices depends strongly on the energy gap of the nonmagnetic layer and should decrease with an increase of the energy gap of the spacer material. A weak coupling in EuS/PbSe and no coupling in EuS/PbTe, where both PbSe and PbTe are narrow-gap semiconductors (E(g)≈0.3 eV), is in disagreement not only with the theoretical expectations but also in stark contrast with earlier results for another narrow-gap spacer system, EuS/PbS, where pronounced antiferromagnetic coupling persists even in samples with PbS layer thicknesses as large as 200 Å. A possible influence of the increasing lattice mismatch between EuS and the spacer materials (0.5%, 0.8%, 2.5% and 8.2% for PbS, SrS, PbSe and PbTe, respectively) on the magnetic ordering of the EuS layer near the interfaces and, consequently, on the interlayer coupling is discussed.

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Magnetization Studies of Antiferromagnetic Interlayer Coupling in EuS-SrS Semiconductor Multilayers

et al. 2013

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Temperature and magnetic eld dependence of magnetization of EuSSrS multilayers grown epitaxially on KCl (001) substrate is experimentally studied by superconducting magnetometry technique. In these lattice-matched semiconductor heterostructures EuS layers are ferromagnetic quantum wells whereas SrS layers are nonmagnetic spacer barriers. The multilayers composed of EuS layers with thickness 3.55 nm and SrS layers (thickness 0.5 10 nm) exhibit ferromagnetic transition at 17 K. In the multilayers with ultrathin SrS spacers (0.51 nm) a nonmonotonic temperature dependence of magnetization as well as a characteristic switching in magnetic hysteresis loops is observed. These experimental ndings are explained considering antiferromagnetic interlayer coupling between ferromagnetic EuS layers via nonmagnetic SrS spacers. The strength of this coupling is determined based on model magnetization calculations.

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Magnetic Properties of EuS-SrS Semiconductor Multilayer Structures

Cited by 3 publications

References 6 publications

Magnetic Properties of EuS/Co Multilayers on KCl and BaF₂ Substrates

Magnetic Properties of EuS/Co Multilayers on KCl and BaF₂ Substrates

Interlayer coupling in EuS/SrS, EuS/PbSe and EuS/PbTe magnetic semiconductor superlattices

Magnetization Studies of Antiferromagnetic Interlayer Coupling in EuS-SrS Semiconductor Multilayers

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