Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers
| Autor: | Dieter Akemeier, Andreas Hütten, Alexander Weddemann, Judith Meyer, Anna-Kristina Regtmeier, Irina Janzen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
magnetic nanoparticles
General Physics and Astronomy lcsh:Chemical technology lcsh:Technology Full Research Paper Magnetization magnetocrystalline anisotropy Nuclear magnetic resonance Monolayer Nanotechnology General Materials Science lcsh:TP1-1185 Electrical and Electronic Engineering lcsh:Science Magnetic moment Condensed matter physics Chemistry lcsh:T Plasma Magnetocrystalline anisotropy lcsh:QC1-999 Hysteresis Nanoscience monolayers dipolar particle coupling Magnetic nanoparticles Particle lcsh:Q lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Vol 4, Iss 1, Pp 164-172 (2013) |
| ISSN: | 2190-4286 |
| Popis: | Self-assembled two-dimensional arrays of either 14 nm hcp-Co or 6 nm ε-Co particle components were treated by hydrogen plasma for various exposure times. A change of hysteretic sample behavior depending on the treatment duration is reported, which can be divided in two time scales: oxygen reduction increases the particle magnetization during the first 20 min, which is followed by an alteration of the magnetic response shape. The latter depends on the respective particle species. Based on the Landau–Lifshitz equations for a discrete set of magnetic moments, we propose a model that relates the change of the hysteresis loops to a dipole-driven ordering of the magnetocrystalline easy axes within the particle plane due to the high spatial aspect ratio of the system. |
| Databáze: | OpenAIRE |
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