Magnetic hardening of Fe30Co70 nanowires
| Autor: | Marina Spasova, Behnaz Arvan, Peter Toson, Ruslan Salikhov, Sara Liébana Viñas, Ester M. Palmero, Manuel Vázquez, Xiang Yao, Cristina Bran, Ulf Wiedwald, Josef Fidler, Michael Farle |
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| Přispěvatelé: | European Commission |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Magnetic domain Nucleation Nanowire Bioengineering 02 engineering and technology 01 natural sciences Condensed Matter::Materials Science Ferrimagnetism 0103 physical sciences General Materials Science Electrical and Electronic Engineering Magnetic anisotropy 010302 applied physics Condensed matter physics Anisotropy energy Mechanical Engineering General Chemistry Coercivity Physik (inkl. Astronomie) 021001 nanoscience & nanotechnology Ferromagnetic resonance Domain wall motion Exchange coupling Mechanics of Materials 0210 nano-technology Magnetic nanowires |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1361-6528 |
| Popis: | 3d transition metal-based magnetic nanowires (NWs) are currently considered as potential candidates for alternative rare-earth-free alloys as novel permanent magnets. Here, we report on the magnetic hardening of FeConanowires in anodic aluminium oxide templates with diameters of 20 nm and 40 nm (length 6 μm and 7.5 μm, respectively) by means of magnetic pinning at the tips of the NWs. We observe that a 3-4 nm naturally formed ferrimagnetic FeCo oxide layer covering the tip of the FeCo NW increases the coercive field by 20%, indicating that domain wall nucleation starts at the tip of the magnetic NW. Ferromagnetic resonance (FMR) measurements were used to quantify the magnetic uniaxial anisotropy energy of the samples. Micromagnetic simulations support our experimental findings, showing that the increase of the coercive field can be achieved by controlling domain wall nucleation using magnetic materials with antiferromagnetic exchange coupling, i.e. antiferromagnets or ferrimagnets, as a capping layer at the nanowire tips. We acknowledge funding from the European Community's Seventh Framework Programme (FP7-NMP) under grant agreement no. 280670 (REFREEPERMAG). |
| Databáze: | OpenAIRE |
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