Title | Controlling magnetism in 2D CrI by electrostatic doping. |
Publication Type | Journal Article |
Year of Publication | 2018 |
Authors | Jiang, S, Li, L, Wang, Z, Mak, KFai, Shan, J |
Journal | Nat Nanotechnol |
Volume | 13 |
Issue | 7 |
Pagination | 549-553 |
Date Published | 2018 07 |
ISSN | 1748-3395 |
Abstract | The atomic thickness of two-dimensional materials provides a unique opportunity to control their electrical and optical properties as well as to drive the electronic phase transitions by electrostatic doping. The discovery of two-dimensional magnetic materials has opened up the prospect of the electrical control of magnetism and the realization of new functional devices. A recent experiment based on the linear magneto-electric effect has demonstrated control of the magnetic order in bilayer CrI by electric fields. However, this approach is limited to non-centrosymmetric materials magnetically biased near the antiferromagnet-ferromagnet transition. Here, we demonstrate control of the magnetic properties of both monolayer and bilayer CrI by electrostatic doping using CrI-graphene vertical heterostructures. In monolayer CrI, doping significantly modifies the saturation magnetization, coercive force and Curie temperature, showing strengthened/weakened magnetic order with hole/electron doping. Remarkably, in bilayer CrI, the electron doping above ~2.5 × 10 cm induces a transition from an antiferromagnetic to a ferromagnetic ground state in the absence of a magnetic field. The result reveals a strongly doping-dependent interlayer exchange coupling, which enables robust switching of magnetization in bilayer CrI by small gate voltages. |
DOI | 10.1038/s41565-018-0135-x |
Alternate Journal | Nat Nanotechnol |
PubMed ID | 29736035 |