Intrinsic 2D ferromagnetism in VSe epitaxial thin films

VSeエピタキシャル薄膜試料における真性の二次元強磁性

中野 匡規*; Wang, Y.*; 吉田 訓*; 松岡 秀樹*; 真島 裕貴*; 池田 啓祐*; 平田 靖透*; 竹田 幸治   ; 和達 大樹*; 小濱 芳允*; 大東 祐汰*; 坂野 昌人*; 石坂 香子*; 岩佐 義宏*

Nakano, Masaki*; Wang, Y.*; Yoshida, Satoshi*; Matsuoka, Hideki*; Majima, Yuki*; Ikeda, Keisuke*; Hirata, Yasuyuki*; Takeda, Yukiharu; Wadachi, Hiroki*; Kohama, Yoshimitsu*; Ohigashi, Yuta*; Sakano, Masato*; Ishizaka, Kyoko*; Iwasa, Yoshihiro*

The discoveries of intrinsic ferromagnetism in atomically thin van der Waals crystals have opened a new research field enabling fundamental studies on magnetism at two-dimensional (2D) limit as well as development of magnetic van der Waals heterostructures. Here we demonstrate that VSe epitaxial thin films grown by molecular-beam epitaxy exhibit emergent 2D ferromagnetism with intrinsic spin polarization of the V 3d electrons although the bulk counterpart is originally antiferromagnetic. Moreover, thickness-dependence measurements reveal that this newly developed 2D ferromagnet could be classified as an itinerant 2D Heisenberg ferromagnet with weak magnetic anisotropy.