Two-dimensional (2D) materials hosting magnetic orders have been discovered in 2016-2017. They have generated tremendous research activity in the past years, partly due to the opportunities they offer to explore low-dimensional on-lattice order physics, and also driven by the prospect for future applications in the field of spintronics. I will give a biased, rather general introduction to this field of research and some of its main current directions, and I will then focus on a particular class of these materials, Cr-based tellurides. Among this family is the 1T polymorph of CrTe2, a truly van der Waals compound exhibiting room temperature ferromagnetism (a rare property for a van der Waals crystals) discovered in Grenoble [1-4], which we are able to controllably and locally transform into other Cr-Te compounds with different magnetic properties .
 A. Purbawati et al., ACS Appl. Mater. Interf. 12, 30702 (2020)
 X. Sun et al., Nano Res. 13, 3358 (2020)
 F. Fabre et al., Phys. Rev. Materials 5, 034008 (2021)
 P. Kumar et al., Phys. Rev. Applied 18, L061002 (2022)
 A. Purbawati, S. Sarkar et al. ACS Appl. Electron. Mater. 5, 764 (2023)
Coffee and pastries will be served at 11:00 in the hall