CC BY-NC-ND 4.0Thiemann, KerstinKerstinThiemannBlug, AndreasAndreasBlugKoss, PeterPeterKossDurmaz, Ali RizaAli RizaDurmazLaskin, GennadiiGennadiiLaskinBertz, AlexanderAlexanderBertzKühnemann, FrankFrankKühnemannStraub, ThomasThomasStraub2022-06-072022-06-072022https://publica.fraunhofer.de/handle/publica/418156https://doi.org/10.24406/h-41815610.1117/12.262176210.24406/h-418156The extreme sensitivity of quantum magnetometers enables new applications in material testing such as the identification of single defect events in the bulk of small volume specimen (0.1 mm³). Exposing ferromagnetic materials to strain alters their magnetic response. Due to uncompensated spins, defects arising from the fatigue process interact with magnetic domain walls. Optically pumped zero-field magnetometers (OPM) provide the sensitivity required to measure small variations in the magnetic response and potentially to quantify damage in the material. We provide first results of a novel micro fatigue setup with an integrated OPM to correlate variations of the magnetic response in a multimodal approach. The position of the Villari reversals within the magneto-mechanic hysteresis and the amplitude of magnetic field are potential candidates to estimate fatigue damage within the specimen.enQuantum sensingMaterial testingLow-cycle fatigueOptical magnetometryconference paper