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The discovery of various primary ferroic phases in atomically-thin van der Waals (vdW) crystals have created a new two-dimensional (2D) wonderland for exploring and manipulating exotic quantum phases. It may also bring technical breakthroughs in device applications, as evident by prototype functionalities of giant tunnelling magnetoresistance, gate-tunable ferromagnetism and non-volatile ferroelectric memory etc. However, 2D multiferroics with effective magnetoelectric coupling (MEC), which ultimately decides the future of multiferroic-based information technology, has not been realized yet. Here, we show that an unconventional MEC mechanism interlocked with heterogeneous ferrielectric (FiE) transitions emerges at the 2D limit in vdW monolayers of CuCrP2S6 with inherent ferromagnetism and antiferroelectricity. Distinct from the homogeneous antiferroelectric (AFE) bulk, thin-layer CuCrP2S6 under external electric field makes layer-dependent heterogeneous FiE transitions, minimizing the depolarization effect introduced by the rearrangements of Cu+ ions within the ferromagnetic vdW cages of CrS6 and P2S6 octahedrons. The resulting FiE phases are characterized by substantially reduced interlayer magnetic coupling energy of nearly 50% with a moderate electric field of 0.3 V/nm, producing widely-tunable MEC which can be further engineered by asymmetrical electrode work functions.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Ferroic phases, magnetoelectric coupling, CuCrP2S6

刊行年月日: 2024-04-08

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 3029

研究助成金:

• National Natural Science Foundation of China 12374194

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-47373-7

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更新時刻: 2025-02-07 16:30:52 +0900

MDRでの公開時刻: 2025-02-07 16:30:52 +0900