SCI CDE with Abstracts (Jan 99 - Dec 99) (D4.1) Record 1 of 6. Title: Anomalous Decreasing of Hyperfine Magnetic-Field Value in the Top Layers of Multilayered Structure Revealed by Mossbauer Reflectometry Method Authors: Semenov-VG Andreeva-MA Irkaev-SM Prokhorov-KA Salashchenko-NN Chumakov-AI Ruffer-R Full source: IZVESTIYA AKADEMII NAUK SERIYA FIZICHESKAYA 1999, Vol 63, Iss 7, pp 1422-1429 Record 2 of 6. Title: Magnetic Trimer on Nonmagnetic Substrate - From Frustration Towards Non-Collinearity Authors: Uzdin-S Uzdin-V Demangeat-C Full source: EUROPHYSICS LETTERS 1999, Vol 47, Iss 5, pp 556-561 Abstract: We present the very first non-collinear magnetic structure calculations of supported metallic 3d triangular trimers. Within the vector Anderson model, in dependence on the ratio between hopping parameters in the trimer the ground state can be collinear or non-collinear. Calculations performed for the Cr and Fe trimers show that the modulus of the magnetic moments per atom are enhanced relatively to bulk value. The dependence, us. hopping integrals, of the angles between the magnetic moments is different when going from Cr to Fe although these angles are equal to 120 degrees in the ground state of the equilateral triangle. Record 3 of 6. Title: Mossbauer Reflectometry of Ultrathin Multilayer Zr(10 nm)/(Fe-57(1.6 nm)/Cr(1.7 nm)X26)/Cr(50 nm) Film Using Synchrotron-Radiation Authors: Andreeva-MA Irkaev-SM Semenov-VG Prokhorov-KA Salashchenko-NN Chumakov-AI Ruffer-R Full source: JOURNAL OF ALLOYS AND COMPOUNDS 1999, Vol 286, Iss 1-2, pp 322-332 Abstract: Time-resolved nuclear resonant reflectivity from ultrathin multilayer Zr(10 nm)/[Fe-57(1.6 nm)/Cr(1.7 nm)x26]/Cr(50 nm) film at grazing incidence angles of synchrotron radiation has been investigated at the Nuclear Resonance Beamline of the European Synchrotron Radiation Facility. For interpretation of the results, complementary measurements of X-ray reflectivity and grazing incidence Moessbauer spectra of reflectivity and secondary electron yield are invoked. Peculiarities and depth-selectivity of the Moessbauer reflectometry method in energy and rime domain are compared. It is shown that using this method the information about top layers of the multilayer structure can be obtained. Computer fitting of the energy and time spectra shows the decreasing of the hyperfine magnetic field in the upper layers of investigated multilayer structure. (C) 1999 Elsevier Science S.A. All rights reserved. Record 4 of 6. Title: Magnetic Dichroism and Spin-Resolved Photoemission from Rough Interfaces Authors: Uzdin-VM Knabben-D Hillebrecht-FU Kisker-E Full source: PHYSICAL REVIEW B-CONDENSED MATTER 1999, Vol 59, Iss 2, pp 1214-1222 Abstract: The magnetic structure of ultrathin Cr films on Fe is analyzed by taking into account the roughness of the surface and of the interface. An algorithm for the epitaxial growth of the film simulates the near-surface structure, and the magnetic moment distribution is calculated self-consistently in a periodic Anderson model. For rough interfaces we find that the layered antiferromagnetic structure of the Cr adlayer is quenched. Within this model we determine the spin polarization and the value of the magnetic linear dichroism to be expected in angle-resolved photoemission. Comparing with experimental data it is concluded that Cr grows on the Fe(001) in a Stranski-Kastranoff mode. We propose an explanation based on the confinement of the itinerant electrons within the Cr islands on the Fe substrate. [S0163-1829(99)13801-3]. Record 5 of 6. Title: Magnetic Superlattices and Multilayers Authors: Schuller-IK Kim-S Leighton-C Full source: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 1999, Vol 200, Iss 1-3, pp 571-582 Abstract: We briefly review the active areas of current research in magnetic superlattices, emphasizing later years. With recent widening use of advanced technologies, more emphasis has been made on quantitative atomic level chemical and structural characterization. Examples where the multilayer structure has been controlled, characterized and correlated with the physical properties are discussed. The physical properties are categorized according to the complexity of a structure needed to observe a particular effect. We outline a number of general important unsolved problems, which could considerably benefit from theoretical and experimental input. An extensive list of magnetic multilayer materials is provided, with references to recent publications. (C) 1999 Published by Elsevier Science B.V. All rights reserved. Record 6 of 6. Title: Mossbauer-Effect Studies of Multilayers and Interfaces Authors: Shinjo-T Keune-W Full source: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 1999, Vol 200, Iss 1-3, pp 598-615 Abstract: The usefulness of Mossbauer spectroscopy for the investigation of magnetic multilayer systems is described. By applying Fe-57 Mossbauer spectroscopy, the behavior of ultrathin magnetic layers, such as FCC-like Fe films on Cu(0 0 1). is studied. Position-specified (depth-selective) information is available by preparing samples in which monatomic Fe-57 probe layers are placed at specific vertical positions, e.g. at interfaces or at the surface. As demonstrated for egitaxial chemically ordered Fe50Pt50 alloy films and polycrystalline nanostructured Tb/Fe multilayers, the Fe-spin structure can be determined directly, and a site-selective Fe-specific magnetic hysteresis loop can be traced in very-highcoercivity materials. For the studies of non-magnetic layers, on the other hand, hyperfine field observations by Au-197 and Sn-119 probes are worthwhile. Spin polarizations in Au layers penetrating from neighboring ferromagnetic 3D layers are estimated from Au-197 Mossbauer spectra and are also studied by inserted Sn-119 probes in Au/3D multilayers. In the Sn spectra for Cr/Sn multilayers, it was found that remarkably large spin polarization is penetrating into Sn layers from a contacting Cr layer, which suggests that Cr atoms in the surface layer have a ferromagnetic alignment. (C) 1999 Elsevier Science B.V. All rights reserved.