Study of a set of micrometeorites from Antarctica using magnetic and ESR methods coupled with micro-XRF

• Published in: Journal of Magnetism and Magnetic Materials
• Main Authors: Marfaing, J., Rochette, P., Pellerey, J., Chaurand, P., Suavet, C., Folco, L.
• Other Authors: Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2008
• Subjects: [SDE]Environmental Sciences; Antarc*; Antarctica
• Online Access: https://hal.science/hal-01426345; https://doi.org/10.1016/j.jmmm.2008.01.037

International audience A collection of iron-rich micrometeorites from Antarctica have been investigated using electron spin resonance (ESR) and conventional magnetic methods to establish a complete magnetic codification of their specific characteristics. Due to the high selectivity of the ESR, the spectra show that the amount and nature of the magnetic impurities contained in these tiny-sized samples, mainly Ni and Cr ions, significantly modify their ESR responses. This result provides a criterion, the Ni/Cr content (identified by spectroscopy), useful for a faithful classification of this class of extraterrestrial particles with close magnetic properties. We attempt to separate the contribution of the different magnetic ions in the ESR response. This method can be easily extended to other magnetic impurities. (c) 2008 Elsevier B.V. All rights reserved.