Magnetic properties of vanadium selenide epitaxial thin films*

The discoveries of ferromagnetism in atomically-thin Cr₂Ge₂Te₆ and CrI₃ crystals have opened up an opportunity for integration of magnetic 2D materials into van der Waals heterostructures. Moreover, the recent discovery of emergent room-temperature ferromagnetism in monolayer VSe₂ [1], which has been known as a paramagnetic metal in its bulk form, should provide an important step toward spintronics applications based on 2D materials, although the existence of ferromagnetism in monolayer VSe₂ is still controversial [2]. We have recently found that vanadium selenide epitaxial thin films fabricated by molecular-beam epitaxy (MBE) with our growth recipe [3] exhibit peculiar magnetic properties with clear anomalous Hall effect down to 2D limit. In this presentation, we will show transport properties of our MBE-grown vanadium selenide epitaxial thin films, and discuss possible origins of this emergent ferromagnetism in our samples. [1] M. Bonilla, et. al., Nat. Nanotechnol. 13, 289 (2018). [2] J. Feng, et. al., Nano Lett. 18, 4493 (2018). [3] M. Nakano, et. al., Nano Lett. 17, 5595 (2017).