Roberts, Andrew P.Zhao, XiangHu, PengxiangAbrajevitch, AlexandraChen, Yen-HuaHarrison, Richard JHeslop, DavidJiang, ZhaoxiaLi, JinhuaLiu, QingsongMuxworthy, Adrian ROda, HirokuniO'Neill, HughPillans, BradleySato, Tetsuro2024-03-192024-03-192169-9313http://hdl.handle.net/1885/316106Hematite carries magnetic signals of interest in tectonic, paleoclimatic, paleomagnetic, and planetary studies. First-order reversal curve (FORC) diagrams have become an important tool for assessing the domain state of, and magnetostatic interactions among, magnetic particles in such studies. We present here FORC diagrams for diverse hematite samples, which provide a catalog for comparison with other studies and explain key features observed for hematite. Ridge-type signatures typical of uniaxial single-domain particle assemblages and “kidney-shaped” FORC signatures, and combinations of these responses, occur commonly in natural and synthetic hematite. Asymmetric features that arise from the triaxial basal plane anisotropy of hematite contribute to vertical spreading in kidney-shaped FORC distributions and are intrinsic responses even for magnetostatically noninteracting particles. The dominant FORC distribution type in a sample (ridge, kidney-shaped, or mixture) depends on the balance between uniaxial/triaxial switching. The identified signals explain magnetization switching and anisotropy features that are intrinsic to the magnetic properties of hematite and other materials with multiaxial magnetic anisotropy.This work was supported financially by the National Institute of Advanced Industrial Science and Technology, Ministry of Economy, Trade and Industry, Japan (APR, HO, DH, XZ, RJH, and ARM), which supported PXH and TS, the Australian Research Council through grants DP160100805 and DP200100765 (APR, DH, RJH, and ARM), the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013)/ERC grant agreement number 320750 (RJH), and the National Natural Science Foundation of China (grants 41922026 and 91858108 to ZXJ and 41920104009 to JHL).application/pdfen-AU© 2021. American Geophysical Union.202110.1029/2021JB0230272022-11-13