Quantum materials display a broad range of collective phenomena governed by quantum mechanics and hold great promise for future applications. In 2D materials in particular, topological phases such as the Quantum Anomalous Hall (QAH) effect hold promises for potential application in the field of spintronics, quantum metrology, or low-power electronics. The quantum anomalous Hall effect, characterised by a one-dimensional edge channel circulating around an insulating surface at zero magnetic field, has been predicted in particular in 3D topological insulators (3D TI) whose topological surface states (TSS) are gapped by breaking time-reversal symmetry (TRS). Although the QAH effect has been first observed in magnetically-doped 3D TIs nearly a decade ago, it has been extremely difficult to tune and to reproduce and control in many materials. New QAH materials operating at higher temperature and over longer length-scales are therefore highly desirable and are actively sought for. A new paradigm recently developed with the discovery of intrinsically magnetic topological insulators such as MnBi2Te4 (MBT). In magnetic TIs, TRS is broken in the whole bulk but without affecting the topological character, which results in the opening of a magnetic gap in the surface states below the magnetic transition temperature. The members of the MBT family and other magnetic TIs are currently intensively investigated in growth, spectroscopy and transport, to understand the characteristics and electronic properties of the material, as well as their topological properties. In particular, electronic, topological and magnetic properties are strongly coupled with each other, and moreover dependent on the microscopic detail and disorder of the system. Efforts are therefore ongoing to achieve high-quality materials, as well as to understand the interaction between magnetism, electronic properties and topology in magnetic TIs. The goal of this project is to better understand the interaction between magnetic, topological and electronic properties in the magnetic 3DTI MBT from bulk samples to monolayers through magnetotransport measurements. To this end, we will study quantum transport and quantum oscillations in nanostructures of high-quality MBT epitaxial thin films, using both moderate and very high magnetic field. In particular, we will investigate epitaxial heterostructures of MBT monolayers on Bi2Te3 (monoMBT/BT) who are predicted to realise a new ferromagnetic QAH system. We will also study the quantum coherent transport and attempt to study the spin dynamics of the system through electrically-detected electron spin resonance. To investigate the intrinsic topological, magnetic and electronic properties of magnetic topological insulator MBT, the project is oriented along two main axes. The investigation of the electronic properties (effective mass, band bending) of thin films of MBT down to monolayer thickness through quantum oscillations (Shubnikov-de-Haas oscillations) in high magnetic fields. The observation of SdH oscillations will enable further understanding of the bulk and surface bands, such as their effective mass and the band bending close to the surface. This study is particularly important monoMBT/BT, for which the band bending and band reconstruction between the MBT monolayer and the BT bulk is unknown. The investigation of static and dynamical spin and electronic properties in thin films and monolayers of magnetic topological insulators MBT through quantum transport. To access the magnetic and electronic state, quantum transport experiments will be performed to study the anomalous Hall effect and of quantum coherent oscillations (universal conductance fluctuations, Aharonov-Bohm effect). Furthermore, the dynamic of the spins and their interaction with conduction electrons (trivial and topological) will be investigated through electrically-detected electron spin resonance.