Details

Autor(en) / Beteiligte

• Chen, Lebing
• Chung, Jae-Ho
• Chen, Tong
• Duan, Chunruo
• Schneidewind, Astrid
• Radelytskyi, Igor
• Voneshen, David J
• Ewings, Russell A
• Stone, Matthew B
• Kolesnikov, Alexander I
• Winn, Barry
• Chi, Songxue
• Mole, R A
• Yu, D H
• Gao, Bin
• Dai, Pengcheng

Titel

Magnetic anisotropy in ferromagnetic CrI3

Ist Teil von

• Physical review. B, 2020-04, Vol.101 (13), p.1

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We use neutron scattering to show that ferromagnetic (FM) phase transition in the two-dimensional (2D) honeycomb lattice CrI3 is a weakly first order transition and controlled by spin-orbit coupling (SOC) induced magnetic anisotropy, instead of magnetic exchange coupling as in a conventional ferromagnet. With increasing temperature, the magnitude of magnetic anisotropy, seen as a spin gap at the Brillouin zone center, decreases in a power law fashion and vanishes at TC, while the in-plane and c-axis spin-wave stiffnesses associated with magnetic exchange couplings remain robust at TC. We also compare parameter regimes where spin waves in CrI3 can be described by a Heisenberg Hamiltonian with Dzyaloshinskii-Moriya interaction or a Heisenberg-Kitaev Hamiltonian. These results suggest that the SOC induced magnetic anisotropy plays a dominant role in stabilizing the FM order in single layer 2D van der Waals ferromagnets.