Unexpected Width of Minor Magnetic Hysteresis Loops in Nanostructures
| Autor: | Armin Satz, Dieter Suess, Pietro Palmesi, Anton Bachleitner-Hofmann, Claas Abert, Florian Bruckner |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Physics Magnetic energy Magnetic domain Condensed matter physics Demagnetizing field 02 engineering and technology 021001 nanoscience & nanotechnology Magnetostatics Magnetic hysteresis 01 natural sciences Electronic Optical and Magnetic Materials Magnetization Magnetic anisotropy 0103 physical sciences Magnetic pressure Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | IEEE Transactions on Magnetics. 52:1-4 |
| ISSN: | 1941-0069 0018-9464 |
| Popis: | We study the coercive fields and phase stability of magnetic nanostructures in hard axis loops and periodic rotational external magnetic fields over wide ranges of field amplitudes depending on the particle size and shape. For this purpose, we use a finite difference code with a gradient descent energy minimization algorithm. Our numerical simulations show that magnetic nanostructures can, in certain field amplitude regions, exhibit minor magnetic hysteresis loops with higher width than their major counterpart as well as variations in the coercive field for consecutive external field periods. The origin of the variations is chaotic behavior of the underlying magnetization processes leading to different residual domains after each field cycle. |
| Databáze: | OpenAIRE |
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