Quantum Imaging of Magnetic Phase Transitions and Spin Fluctuations in Intrinsic Magnetic Topological Nanoflakes
Quantum Imaging of Magnetic Phase Transitions and Spin Fluctuations in Intrinsic Magnetic Topological Nanoflakes
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DOI：
10.1021/acs.nanolett.2c01390
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发表时间：
2022-07-11
期刊：
影响因子：
10.8
通讯作者：
Du, Chunhui Rita
中科院分区：
文献类型：
--
作者：
McLaughlin, Nathan J.;Hu, Chaowei;Du, Chunhui Rita
拓扑材料具有奇异的能带结构、非常规的电流模式和新兴的组织原理，为下一代变革性量子电子技术的发展提供了诱人的平台。在这一背景下，MnBi2Te4(Bi2Te3)(N)材料家族自然是相关的，因为它们具有非平凡的能带拓扑结构、可调谐的磁性以及最近发现的特殊的量子输运行为。尽管迄今为止有许多开创性的研究，但MnBi2Te4(Bi2Te3)(N)的局域磁性仍然是一个悬而未决的问题，阻碍了对其基本材料性质的全面了解。利用金刚石中的氮空位(NV)中心，我们报道了剥离的MnBi4Te7薄片的磁性相变和自旋涨落的纳米尺度量子成像，揭示了纳米尺度下潜在的自旋输运物理和磁畴。我们的结果突出了NV中心在探索新兴量子材料的磁性方面的独特优势，为研究拓扑和磁性之间的相互作用打开了新的机会。
Topological materials featuring exotic band structures, unconventional current flow patterns, and emergent organizing principles offer attractive platforms for the development of next-generation transformative quantum electronic technologies. The family of MnBi2Te4 (Bi2Te3)(n) materials is naturally relevant in this context due to their nontrivial band topology, tunable magnetism, and recently discovered extraordinary quantum transport behaviors. Despite numerous pioneering studies to date, the local magnetic properties of MnBi2Te4 (Bi2Te3)(n) remain an open question, hindering a comprehensive understanding of their fundamental material properties. Exploiting nitrogen-vacancy (NV) centers in diamond, we report nanoscale quantum imaging of the magnetic phase transitions and spin fluctuations in exfoliated MnBi4Te7 flakes, revealing the underlying spin transport physics and magnetic domains at the nanoscale. Our results highlight the unique advantage of NV centers in exploring the magnetic properties of emergent quantum materials, opening new opportunities for investigating the interplay between topology and magnetism.