CoPt alloy grown on the WSe2(0001) van der Waals surface
| Autor: | Denys Makarov, Fabiola Liscio, Mireille Maret, Günter Schatz, C. Brombacher, Manfred Albrecht, J.P. Simon |
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| Přispěvatelé: | Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2008 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Film plane [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetic hysteresis 01 natural sciences Grain size Electronic Optical and Magnetic Materials Magnetization Magnetic anisotropy Tetragonal crystal system 0103 physical sciences [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering 0210 nano-technology Superparamagnetism |
| Zdroj: | Journal of Magnetism and Magnetic Materials Journal of Magnetism and Magnetic Materials, Elsevier, 2008, 320, pp.1858-1866 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2008.02.164 |
| Popis: | The structural and magnetic properties of 3-nm-thick CoPt alloys grown on WSe2(0 0 0 1) at various temperature are investigated. Deposition at room temperature leads to the formation of a chemically disordered fcc CoPt alloy with [1 1 1] orientation. Growth at elevated temperatures induces L10 chemical order starting at 470 K accompanied with an increase in grain size and a change in grain morphology. As a consequence of the [1 1 1] growth direction, the CoPt grains can adopt one of the three possible variants of the L10 phase with tetragonal c-axis tilted from the normal to the film plane direction at 54°. The average long-range order parameter is found to be 0.35(±0.05) and does not change with the increase in the deposition temperature from 570 to 730 K. This behavior might be related to Se segregation towards the growing facets and surface disorder effects promoted by a high surface-to-volume ratio. Magnetic studies reveal a superparamagnetic behavior for the films grown at 570 and 730 K in agreement with the film morphology and degree of chemical order. The measurements at 10 K reveal the orientation of the easy axis of the magnetization lying basically in the film plane. |
| Databáze: | OpenAIRE |
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