Large edge magnetism in oxidized few-layer black phosphorus nanomeshes
black phosphorus nanomesh, edge magnetism, spintronics, zigzag edge, oxygen termination, rare-metal free
ABSTRACT The formation and control of a room-temperature magnetic order in twodimensional (2D) materials is a challenging quest for the advent of innovative magnetic- and spintronic-based technologies. To date, edge magnetism in 2D materials has been experimentally observed in hydrogen (H)-terminated graphene nanoribbons (GNRs) and graphene nanomeshes (GNMs), but the measured magnetization remains far too small to allow envisioning practical applications. Herein, we report experimental evidences of large room-temperature edge ferromagnetism (FM) obtained from oxygen (O)-terminated zigzag pore edges of few-layer black phosphorus (P) nanomeshes (BPNMs). The magnetization values per unit area are ~100 times larger than those reported for H-terminated GNMs, while the magnetism is absent for H-terminated BPNMs. The magnetization measurements and the first-principles simulations suggest that the origin of such a magnetic order could stem from ferromagnetic spin coupling between edge P with O atoms, resulting in a strong spin localization at the edge valence band, and from uniform oxidation of full pore edges over a large area and interlayer spin interaction. Our findings pave the way for realizing high-efficiency 2D flexible magnetic and spintronic devices without the use of rare magnetic elements.
Tsinghua University Press
Yudai Nakanishi,Ayumi Ishi,Chika Ohata,David Soriano,Ryo Iwaki,Kyoko Nomura,Miki Hasegawa,Taketomo Nakamura,Shingo Katsumoto,Stephan Roche,Junji Haruyama, Large edge magnetism in oxidized few-layer black phosphorus nanomeshes. NanoRes.2017, 10(2): 718–728