울산대학교 | 미래혁신응집물질물리인재교육연구단

Tunability of magnetic anisotropy of Co on two-dimensional materials by tetrahedral bonding
작성자	김**	작성일	2019-07-29	조회수	108
Journal Article published 18 Jan 2019 in Physical Review B volume 99 issue 1 Research funded by National Research Foundation of Korea \| Ministry of Science, ICT and Future Planning (2015M3D1A1070465) Authors: D. Odkhuu, T. Tsevelmaa, P. Taivansaikhan, N. Park, S. C. Hong, S. H. Rhim https://doi.org/10.1103/physrevb.99.014419 Abstract Pairing of $π$ electronic state structures with functional or metallic atoms makes them possible to engineer physical and chemical properties. Herein, we predict the reorientation of magnetization of Co on hexagonal BN ( $h ? BN$ ) and graphene multilayers. The driving mechanism is the formation of the tetrahedral bonding between $s p^{3}$ and $d$ orbitals at the interface. More specifically, the intrinsic $π$ bonding of $h ? BN$ and graphene is transformed to $s p^{3}$ as a result of strong hybridization with metallic $d_{z^{2}}^{2}$ orbital. The different features of these two tetrahedral bondings, $s p^{2}$ and $s p^{3}$ , are well manifested in charge density and density of states in the vicinity of the interface, along with associated band structure near the $? ?? ? K$ valley. Our findings provide an approach to tailoring magnetism by means of degree of the interlayer hybrid bonds in two-dimensional layered materials.

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