article published yes C. L. Tschirhart author M. Serlin author Hryhoriy Polshyn author edfc7cb1-526e-11ec-b05a-e6ecc27e4e480000-0001-8223-8896 A. Shragai author Z. Xia author J. Zhu author Y. Zhang author K. Watanabe author T. Taniguchi author M. E. Huber author A. F. Young author Electrons in moiré flat band systems can spontaneously break time-reversal symmetry, giving rise to a quantized anomalous Hall effect. In this study, we use a superconducting quantum interference device to image stray magnetic fields in twisted bilayer graphene aligned to hexagonal boron nitride. We find a magnetization of several Bohr magnetons per charge carrier, demonstrating that the magnetism is primarily orbital in nature. Our measurements reveal a large change in the magnetization as the chemical potential is swept across the quantum anomalous Hall gap, consistent with the expected contribution of chiral edge states to the magnetization of an orbital Chern insulator. Mapping the spatial evolution of field-driven magnetic reversal, we find a series of reproducible micrometer-scale domains pinned to structural disorder. American Association for the Advancement of Science2021 eng multidisciplinary 0036-8075 1095-9203 2006.08053 3404532210.1126/science.abd3190 37265481323-1327 yes Tschirhart, C. L., Serlin, M., Polshyn, H., Shragai, A., Xia, Z., Zhu, J., … Young, A. F. (2021). Imaging orbital ferromagnetism in a moiré Chern insulator. <i>Science</i>. American Association for the Advancement of Science. <a href="https://doi.org/10.1126/science.abd3190">https://doi.org/10.1126/science.abd3190</a> C. L. Tschirhart <i>et al.</i>, “Imaging orbital ferromagnetism in a moiré Chern insulator,” <i>Science</i>, vol. 372, no. 6548. American Association for the Advancement of Science, pp. 1323–1327, 2021. Tschirhart, C. L., et al. “Imaging Orbital Ferromagnetism in a Moiré Chern Insulator.” <i>Science</i>, vol. 372, no. 6548, American Association for the Advancement of Science, 2021, pp. 1323–27, doi:<a href="https://doi.org/10.1126/science.abd3190">10.1126/science.abd3190</a>. Tschirhart CL, Serlin M, Polshyn H, et al. Imaging orbital ferromagnetism in a moiré Chern insulator. <i>Science</i>. 2021;372(6548):1323-1327. doi:<a href="https://doi.org/10.1126/science.abd3190">10.1126/science.abd3190</a> C.L. Tschirhart, M. Serlin, H. Polshyn, A. Shragai, Z. Xia, J. Zhu, Y. Zhang, K. Watanabe, T. Taniguchi, M.E. Huber, A.F. Young, Science 372 (2021) 1323–1327. Tschirhart CL, Serlin M, Polshyn H, Shragai A, Xia Z, Zhu J, Zhang Y, Watanabe K, Taniguchi T, Huber ME, Young AF. 2021. Imaging orbital ferromagnetism in a moiré Chern insulator. Science. 372(6548), 1323–1327. Tschirhart, C. L., M. Serlin, Hryhoriy Polshyn, A. Shragai, Z. Xia, J. Zhu, Y. Zhang, et al. “Imaging Orbital Ferromagnetism in a Moiré Chern Insulator.” <i>Science</i>. American Association for the Advancement of Science, 2021. <a href="https://doi.org/10.1126/science.abd3190">https://doi.org/10.1126/science.abd3190</a>. 106162022-01-13T12:17:45Z2022-01-13T14:11:36Z