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論文

Layer-number-independent two-dimensional ferromagnetism in Cr$$_3$$Te$$_4$$

Wang, Y.*; 梶原 駿*; 松岡 秀樹*; Saika, B. K.*; 山神 光平*; 竹田 幸治; 和達 大樹*; 石坂 香子*; 岩佐 義宏*; 中野 匡規*

Nano Letters, 22(24), p.9964 - 9971, 2022/12

https://doi.org/10.1021/acs.nanolett.2c03532
 被引用回数：2 パーセンタイル：62.62(Chemistry, Multidisciplinary)

In a conventional magnetic material, a long-range magnetic order develops in three dimensions, and reducing a layer number weakens its magnetism. Here we demonstrate anomalous layer-number-independent ferromagnetism down to the two-dimensional (2D) limit in a metastable phase of Cr$$_3$$Te$$_4$$. We fabricated Cr$$_3$$Te$$_4$$ thin films by molecular-beam epitaxy and found that Cr$$_3$$Te$$_4$$ could host two distinct ferromagnetic phases characterized with different Curie temperatures ($$T_mathrm{C}$$). One is the bulk-like high-$$T_mathrm{C}$$ phase showing room-temperature ferromagnetism, which is consistent with previous studies. The other is the metastable low-$$T_mathrm{C}$$ phase with $$T_mathrm{C}$$ $${approx}$$ 160 K, which exhibits a layer-number-independent $$T_mathrm{C}$$ down to the 2D limit in marked contrast with the conventional high-$$T_mathrm{C}$$ phase, demonstrating a purely 2D nature of its ferromagnetism. Such significant differences between two distinct phases could be attributed to a small variation in the doping level, making this material attractive for future ultracompact spintronics applications with potential gate-tunable room-temperature 2D ferromagnetism.

論文

Spin-orbit-induced Ising ferromagnetism at a van der Waals interface

松岡 秀樹*; Barnes, S. E.*; 家田 淳一; 前川 禎通; Bahramy, M. S.*; Saika, B. K.*; 竹田 幸治; 和達 大樹*; Wang, Y.*; 吉田 訓*; et al.

Nano Letters, 21(4), p.1807 - 1814, 2021/02

https://doi.org/10.1021/acs.nanolett.0c04851
 被引用回数：9 パーセンタイル：75.68(Chemistry, Multidisciplinary)

Magnetocrystalline anisotropy, a key ingredient for establishing long-range order in a magnetic material down to the two-dimensional (2D) limit, is generally associated with spin-orbit interaction (SOI) involving a finite orbital angular momentum. Here we report strong out-of-plane magnetic anisotropy without orbital angular momentum, emerging at the interface between two different van der Waals (vdW) materials, an archetypal metallic vdW material NbSe$$_{2}$$ possessing Zeeman-type SOI and an isotropic vdW ferromagnet V$${}_5$$Se$${}_8$$. We found that the Zeeman SOI in NbSe$$_{2}$$ induces robust out-of-plane magnetic anisotropy in V$$_{5}$$Se$$_{8}$$ down to the 2D limit with a more than 2-fold enhancement of the transition temperature. We propose a simple model that takes into account the energy gain in NbSe$$_{2}$$ in contact with a ferromagnet, which naturally explains our observations. Our results demonstrate a conceptually new magnetic proximity effect at the vdW interface, expanding the horizons of emergent phenomena achievable in vdW heterostructures.

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