Dr. Jun Woo Choi
Center for Spintronics, Korea Institute of Science and Technology (KIST)
van der Waals magnetic materials: fundamental properties and spintronics applications
Location: 4138 Physics Research Building
Faculty Host: Roland Kawakami
Abstract: Recent discovery of intrinsic two-dimensional (2D) ferromagnetism in van der Waals (vdW) ferromagnetic materials has stimulated research on the fundamental properties and spintronic applications of the materials and their heterostructures. VdW-ferromagnet-based nanostructures and heterostructures provide clean and well-defined interfaces which enable systematic investigation of interfacial magnetism and spin transport. Moreover, they provide exciting opportunities to tune 2D magnetism in an unprecedented manner, via strain, gating, proximity effect, twist angle, and optical excitations, readily available in the 2D materials world.
In this talk, we report on our recent research progress on van der Waals (vdW) ferromagnets [1,2,3]. VdW ferromagnetic materials can show unique magnetic characteristics, distinct from conventional magnetic materials, due to the weak interlayer coupling strength [2]. Furthermore, heterostructures between various vdW material families can be fabricated, which facilitates the study of interfacial phenomena. Here, we show that the magnetic properties of vdW ferromagnets can be readily controlled by external parameters such as doping, strain, and voltage gating [1,3]. Such controllability provides a key technological advance in potential vdW-magnetic-materials-based device applications.
[1] S. Park et al., Nano Lett. 20, 95 (2020).
[2] H. Gweon et al., Nano Lett. 21, 1672 (2021).
[3] J. Eom et al., Nat. Commun. 14, 5605 (2023)
