Imaging thermally fluctuating Nèel vectors in van der Waals antiferromagnet NiPS3
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917656310841344 |
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| author | Lee, Youjin Kim, Chaebin Son, Suhan Cui, Jingyuan Park, Giung Zhang, Kai-Xuan Oh, Siwon Cheong, Hyeonsik Kleibert, Armin Park, Je-Geun |
| author_facet | Lee, Youjin Kim, Chaebin Son, Suhan Cui, Jingyuan Park, Giung Zhang, Kai-Xuan Oh, Siwon Cheong, Hyeonsik Kleibert, Armin Park, Je-Geun |
| contents | Studying antiferromagnetic domains is essential for fundamental physics and potential spintronics applications. Despite its importance, few systematic studies have been performed on van der Waals (vdW) antiferromagnets (AFMs) domains with high spatial resolutions, and direct probing of the Nèel vectors remains challenging. In this work, we found a multidomain in vdW AFM NiPS3, a material extensively investigated for its exotic magnetic exciton. We employed photoemission electron microscopy combined with the X-ray magnetic linear dichroism (XMLD-PEEM) to image the NiPS3's magnetic structure. The nanometer-spatial resolution of XMLD-PEEM allows us to determine local Nèel vector orientations and discover thermally fluctuating Néel vectors that are independent of the crystal symmetry even at 65 K, well below TN of 155 K. We demonstrate a Ni ions' small in-plane orbital moment anisotropy is responsible for the weak magneto-crystalline anisotropy. The observed multidomain's thermal fluctuations may explain the broadening of magnetic exciton peaks at higher temperatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_01846 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Imaging thermally fluctuating Nèel vectors in van der Waals antiferromagnet NiPS3 Lee, Youjin Kim, Chaebin Son, Suhan Cui, Jingyuan Park, Giung Zhang, Kai-Xuan Oh, Siwon Cheong, Hyeonsik Kleibert, Armin Park, Je-Geun Materials Science Mesoscale and Nanoscale Physics Studying antiferromagnetic domains is essential for fundamental physics and potential spintronics applications. Despite its importance, few systematic studies have been performed on van der Waals (vdW) antiferromagnets (AFMs) domains with high spatial resolutions, and direct probing of the Nèel vectors remains challenging. In this work, we found a multidomain in vdW AFM NiPS3, a material extensively investigated for its exotic magnetic exciton. We employed photoemission electron microscopy combined with the X-ray magnetic linear dichroism (XMLD-PEEM) to image the NiPS3's magnetic structure. The nanometer-spatial resolution of XMLD-PEEM allows us to determine local Nèel vector orientations and discover thermally fluctuating Néel vectors that are independent of the crystal symmetry even at 65 K, well below TN of 155 K. We demonstrate a Ni ions' small in-plane orbital moment anisotropy is responsible for the weak magneto-crystalline anisotropy. The observed multidomain's thermal fluctuations may explain the broadening of magnetic exciton peaks at higher temperatures. |
| title | Imaging thermally fluctuating Nèel vectors in van der Waals antiferromagnet NiPS3 |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.01846 |