Transition between canted antiferromagnetic and spin-polarized ferromagnetic quantum Hall states in graphene on a ferrimagnetic insulator

0561012 - FZÚ 2023 RIV US eng J - Journal Article
Li, Y. - Amado, M. - Hyart, T. - Mazur, G. P. - Risinggard, V. - Wagner, T. - McKenzie-Sell, L. - Kimbell, G. - Wunderlich, Joerg - Linder, J. - Robinson, J.W.A.
Transition between canted antiferromagnetic and spin-polarized ferromagnetic quantum Hall states in graphene on a ferrimagnetic insulator.
Physical Review B. Roč. 101, č. 24 (2020), č. článku 241405. ISSN 2469-9950. E-ISSN 2469-9969
Institutional support: RVO:68378271
Keywords : quantum hall ferromagnets * magnetic proximity effect * graphene
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 4.036, year: 2020
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.101.241405

In the quantum Hall regime of graphene, antiferromagnetic and spin-polarized ferromagnetic states at the zeroth Landau level compete, leading to a canted antiferromagnetic state depending on the direction and magnitude of an applied magnetic field. Here, we investigate this transition at 2.7 K in graphene Hall bars that are proximity coupled to the ferrimagnetic insulator Y3Fe5O12 . From nonlocal transport measurements, we demonstrate an induced magnetic exchange field in graphene, which lowers the magnetic field required to modulate the magnetic state in graphene. These results show that a magnetic proximity effect in graphene is an important ingredient for the development of two-dimensional materials in which it is desirable for ordered states of matter to be tunable with relatively small applied magnetic fields (>6 T).
Permanent Link: https://hdl.handle.net/11104/0333762