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3 Acta Physica Polonica A

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Magnetic Anisotropy in Co/Nd Multilayers with Depth-Selectively Inserted ^{57}Fe Probe Layer

100%

Baczewski L. , Mibu K. , Nagahama T. , Shinjo T.

nr 3

439-442

Multilayers of Co/Nd with probe layer of 2 Å of ^{57}Fe evaporated in UHV conditions were studied by means of vibrating sample magnetometry and Mössbauer spectroscopy at T = 4.2 K. Isomer shift, hyperfine field distribution and direction was obtained from the Mössbauer data computer fitting. Magnetic anisotropy was studied and discussed. The easy magnetization direction was close to the perpendicular direction for both samples but the tendency to perpendicular anisotropy was stronger when the Fe probe layer was placed in the vicinity of Co/Nd interface.

Stm Observed Surface Structures and Magnetic Properties of MBE-Grown Metallic Thin Films

88%

Kalinowski R. , Baczewski L. , Wawro A. , Meyer C. , Raułuszkiewicz J.

nr 2

409-413

Rare-earth epitaxial thin films of Tb and Gd of the thicknesses between 2 nm and 16 nm were deposited by means of molecular beam epitaxy method. The roughness of the rare-earth films measured by scanning tunneling microscopy was found to be in the range of 1-4.5 nm. The influence of the roughness on the dipolar anisotropy and magnetocrystalline surface anisotropy was estimated. The magnetic measurements have shown that the Gd layers deposited on the Y buffer layers had an easy plane anisotropy. However, for 2 nm thick Gd layer deposited on W buffer layer the perpendicular anisotropy was observed. According to the roughness analysis the possible sources of the perpendicular anisotropy in this sample is mainly the magnetoelastic anisotropy, but the presence of the magnetocrystalline surface anisotropy also cannot be neglected.

Growth and Properties of ZnMnTe Nanowires

45%

Zaleszczyk W. , Janik E. , Presz A. , Szuszkiewicz W. , Morhange J. , Dłużewski P. , Kret S. , Kirmse H. , Neumann W. , Dynowska E. , Domagała J. , Caliebe W. , Aleszkiewicz M. , Pacuski W. , Golnik A. , Kossacki P. , Baczewski L. , Petroutchik A. , Karczewski G. , Wojtowicz T.

nr 2

351-356

Catalytically enhanced growth of ZnMnTe diluted magnetic semiconductor nanowires by molecular beam epitaxy is reported. The growth is based on the vapor-liquid-solid mechanism and was performed on (001) and (011)-oriented GaAs substrates from elemental sources. X-ray diffractometry, scanning and transmission electron microscopy, atomic force microscopy, photoluminescence spectroscopy, and Raman scattering were performed to determine the structure of nanowires, their chemical composition, and morphology. These studies revealed that the obtained ZnMnTe nanowires possess zinc-blende structure, have an average diameter of about 30 nm, typical length between 1 and 2μm and that Mn^{2+} ions were incorporated into substitutional sites of the ZnTe crystal lattice.