Research / 2020 / Article / Fig 4

Review Article

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

Figure 4

(a) Scheme of three basic mechanisms of anomalous Hall effect. (b) Hall resistivity of Cr0.68Se at 2 K. (c, d) Hall resistivity of Fe3GeTe2 of 12 nm thick under various temperatures (c) and of varying thicknesses at 2 K (d) with . (e, f) Hall resistivity of Co3Sn2S2 as a function of out-of-plane magnetic field at 100, 50, and 2 K (e) and as a function of temperature at zero magnetic field (f). (g) Scheme of the crystal lattice and magnetic structure of MnBi2nTe3n+1 family (). (h) Illustration of intrinsic axion insulator in even layers and quantum anomalous Hall (QAH) insulator in odd layers. (i) Topological phases and magnetic phases of 2D and 3D MnBi2Te4. (j) Topological phase diagram in the 2D limit of a 3D topological insulator as a function of the crystal thickness and magnetization gM, including the normal insulator (grey area), quantum spin Hall effect (QSHE) with preserved time-reversal symmetry (blue line), QSHE with broken time-reversal symmetry (yellow area), and quantum anomalous Hall effect (QAHE) (cyan area). (k) Magnetic transition in five-layer MnBi2Te4 under and at 1.6 K. (l) Hall resistivity of bulk MnBi4Te7 at 2 K with and . (m, n) Magnetization, Hall resistivity, and planar magnetoresistivity of few-layer MnBi6Te10 with of 0.3 T (m) and MnBi8Te13 with of 0.2 T (n) at 2 K. Panels (a, b) are reproduced with permission from ref. [43], copyright 2017 Applied Physics Letters. Panel (c) is reproduced with permission from ref. [46], copyright 2018 Nature Materials. Panel (d) is reproduced with permission from ref. [47], copyright 2018 Nature Communications. Panels (e, f) are reproduced with permission from ref. [48], copyright 2018 Nature Physics. Panels (g, n) are reproduced with permission from ref. [59], copyright 2019 Arxiv. Panels (h, i) are reproduced with permission from ref. [54], copyright 2019 Science Advances. Panel (j) is reproduced with permission from ref. [57], copyright 2019 Physical Review Letters. Panel (k) is reproduced with permission from ref. [55], copyright 2019 Arxiv. Panel (l) is reproduced with permission from ref. [56], copyright 2020 Nature Communications. Panel (m) is reproduced with permission from ref. [58], copyright 2019 Arxiv.