Effective anisotropies in magnetic nanowires using the torque method
| Autor: | Manuel Vázquez, Nicoleta Lupu, T. Fehér, José A. Fernández-Roldán, Daniel G. Trabada, H. Chiriac, Cristina Bran, C. Rotarescu, Norbert M. Nemes, Oksana Chubykalo-Fesenko, Roberto Moreno, Tibor-Adrian Óvári |
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| Přispěvatelé: | European Commission, Executive Unit for Financing Higher Education, Research, Development and Innovation (Romania), Hungarian Scientific Research Fund, Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Nanowire Physics::Optics 02 engineering and technology 01 natural sciences Monocrystalline silicon Condensed Matter::Materials Science Magnetization 0103 physical sciences Physics::Atomic and Molecular Clusters Perpendicular Anisotropy Torque method 010302 applied physics Condensed matter physics Nanowires Condensed Matter::Other Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Vortex Magnetic anisotropy Crystallite 0210 nano-technology Micromagnetic simulations |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2017.07.059 |
| Popis: | The effective anisotropy of Co-based nanowires such as CoFe, monocrystalline hcp Co and polycrystalline Co with a mixture of fcc and hcp grains has been evaluated through micromagnetic modeling based on the magnetization torque simulations. We retrieve the experimental profile of the torque curves and show that the non-harmonic forms observed at low fields correspond to the presence of open vortices at the nanowire ends. Our results show that strong hcp anisotropy of Co cannot overcome the uniaxial character of the effective anisotropy which always remains parallel to the nanowire axis, even in the case of magnetocrystalline easy axis perpendicular to the nanowire. We evaluate effective anisotropy values for monocrystalline Co nanowires with different easy axis orientations and polycrystalline Co nanowires with different mixtures of hcp and fcc grains. Work supported by the Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCCDI) under project PN 16 37 02 02 (Nucleu Program) and by the European Commission under Grant no. 316194 (NANOSENS). The work of R.M., N.N., M.V and O.C. F was partially supported by Spanish MINECO Grant MAT2016-76824-C3-1-R, MAT2014-52405-C02-02 and MAT2013-48054-C2-1-R. The work of T.F. was partially supported by the Hungarian research fund OTKA K 107228. |
| Databáze: | OpenAIRE |
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