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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2402.17594 |
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| _version_ | 1866917599501090816 |
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| author | Schröder, Christian Ghebretinsae, Bereket Lonsky, Martin Mamoori, Mohanad Al Porrati, Fabrizio Huth, Michael Müller, Jens |
| author_facet | Schröder, Christian Ghebretinsae, Bereket Lonsky, Martin Mamoori, Mohanad Al Porrati, Fabrizio Huth, Michael Müller, Jens |
| contents | We present a comprehensive study of small-scale three-dimensional (3D) tetrahedral CoFe nanostructure arrays prepared by focused electron beam-induced deposition (FEBID) and placed in two distinct orientations with respect to the direction of an external magnetic field. Using ultra-sensitive micro-Hall magnetometry we obtain angular-dependent magnetic stray field hysteresis loops that show characteristic cascading magnetic switching close to zero magnetic field. By employing micromagnetic simulations we could reproduce the hysteresis loops and identify characteristic field dependent magnetic configurations including a vortex-type groundstate. From this we derive a coarse-graining macrospin model and show that the complex switching behavior can be explained by the reorientation dynamics of non-interacting uniaxial anisotropic magnetic grains modeled as a superposition of Stoner-Wohlfarth particles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_17594 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of magnetic switching cascades in tetrahedral CoFe nanostructures Schröder, Christian Ghebretinsae, Bereket Lonsky, Martin Mamoori, Mohanad Al Porrati, Fabrizio Huth, Michael Müller, Jens Mesoscale and Nanoscale Physics We present a comprehensive study of small-scale three-dimensional (3D) tetrahedral CoFe nanostructure arrays prepared by focused electron beam-induced deposition (FEBID) and placed in two distinct orientations with respect to the direction of an external magnetic field. Using ultra-sensitive micro-Hall magnetometry we obtain angular-dependent magnetic stray field hysteresis loops that show characteristic cascading magnetic switching close to zero magnetic field. By employing micromagnetic simulations we could reproduce the hysteresis loops and identify characteristic field dependent magnetic configurations including a vortex-type groundstate. From this we derive a coarse-graining macrospin model and show that the complex switching behavior can be explained by the reorientation dynamics of non-interacting uniaxial anisotropic magnetic grains modeled as a superposition of Stoner-Wohlfarth particles. |
| title | Origin of magnetic switching cascades in tetrahedral CoFe nanostructures |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2402.17594 |