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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.01284 |
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| _version_ | 1866909059741908992 |
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| author | Lu, Xingyuan Zou, Ji Pham, Minh Rana, Arjun Liao, Chen-Ting Subramanian, Emma Cating Wu, Xuefei Lo, Yuan Hung Bevis, Charles S. Karl Jr, Robert M. Lepadatu, Serban Yu, Young-Sang Tserkovnyak, Yaroslav Russell, Thomas P. Shapiro, David A. Kapteyn, Henry C. Murnane, Margaret M. Streubel, Robert Miao, Jianwei |
| author_facet | Lu, Xingyuan Zou, Ji Pham, Minh Rana, Arjun Liao, Chen-Ting Subramanian, Emma Cating Wu, Xuefei Lo, Yuan Hung Bevis, Charles S. Karl Jr, Robert M. Lepadatu, Serban Yu, Young-Sang Tserkovnyak, Yaroslav Russell, Thomas P. Shapiro, David A. Kapteyn, Henry C. Murnane, Margaret M. Streubel, Robert Miao, Jianwei |
| contents | We use soft x-ray vector-ptychographic tomography to determine the three-dimensional magnetization field in superparamagnetic nanoparticles self-assembled at the liquid-liquid interface and reveal the magnetic order induced by layered structure. The spins in individual nanoparticles become more aligned with increasing number of layers, resulting in a larger net magnetization. Our experimental results show a magnetic short-range order in the monolayer due to the proliferation of thermally induced magnetic vortices and a magnetic long-range order in the bilayer and trilayer, stemming from the strengthened dipolar interactions that effectively suppress thermal fluctuations. We also observe a screening effect of magnetic vortices and the attractive interaction between the magnetic vortices with opposite topological charges. Our work demonstrates the crucial role of layered structure in shaping the magnetization of nanoparticle assemblies, providing new opportunities to modulate these properties through strategic layer engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_01284 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Visualizing Magnetic Order in Self-Assembly of Superparamagnetic Nanoparticles Lu, Xingyuan Zou, Ji Pham, Minh Rana, Arjun Liao, Chen-Ting Subramanian, Emma Cating Wu, Xuefei Lo, Yuan Hung Bevis, Charles S. Karl Jr, Robert M. Lepadatu, Serban Yu, Young-Sang Tserkovnyak, Yaroslav Russell, Thomas P. Shapiro, David A. Kapteyn, Henry C. Murnane, Margaret M. Streubel, Robert Miao, Jianwei Mesoscale and Nanoscale Physics Materials Science We use soft x-ray vector-ptychographic tomography to determine the three-dimensional magnetization field in superparamagnetic nanoparticles self-assembled at the liquid-liquid interface and reveal the magnetic order induced by layered structure. The spins in individual nanoparticles become more aligned with increasing number of layers, resulting in a larger net magnetization. Our experimental results show a magnetic short-range order in the monolayer due to the proliferation of thermally induced magnetic vortices and a magnetic long-range order in the bilayer and trilayer, stemming from the strengthened dipolar interactions that effectively suppress thermal fluctuations. We also observe a screening effect of magnetic vortices and the attractive interaction between the magnetic vortices with opposite topological charges. Our work demonstrates the crucial role of layered structure in shaping the magnetization of nanoparticle assemblies, providing new opportunities to modulate these properties through strategic layer engineering. |
| title | Visualizing Magnetic Order in Self-Assembly of Superparamagnetic Nanoparticles |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2401.01284 |