By Qnami
Atomically thin van der Walls magnets have been found to be not only an optimal platform for fundamental studies of magnetism in two-dimensional systems, but also promising candidates for next-generation spintronic devices.Bidimensional van der Waals magnets have been extensively investigated at micrometer scale s.H owever,many of the relevant magnetic properties would be measurable only by probing materials at nano scale resolution s. Professor Wrachtrup’s group and collaborators used Qnami Quantilever MX probes to assess nanoscale magnetic features of atomically thin bilayers of the ferromagnetic insulator CrBr 3.The m agnetic domains and their dynamics in CrBr 3 have been predicted but never ex p erimentally observed before. The team proved the possibility of identifying magnetic domains and study their dynamics in bidimensional van der Waals magnets u sing scanning NV magnetometry in cryogenic(4K) environment.By using a pulsed measurement scheme,they achieved optimal magnetic field sensitivity and minimize sample heating due to continuous microwave. The team was able to measure the stray magnetic field,determine the magnetization and identify the magnetic domains on the CrBr3 bilayer. Researchers studied the evolution of magnetic domains as a function of changing external magnetic field.D omain wall pinning effects were observed and material defect sites identified.
