Magnetic properties of lamellar tetrataenite in Toluca iron meteorite

• Main Authors: Minoru Funaki, Takesi Nagata, Jacques A. Danon
• Format: Report
• Language: English
• Published: National Institute of Polar Research 1986
• Subjects: Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1980; http://id.nii.ac.jp/1291/00001980/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1980&item_no=1&attribute_id=18&file_no=1

Magnetic studies were conducted using lamellar tetrataenite extracted from the Toluca octahedrite by a diluted HCl etching technique. Natural remanent magnetization (NRM) in the lamellae is very stable against AF demagnetization and is quite intense, ranging from 2.58 to 37.42×(10)^<-2> Am^2/kg. This NRM is completely demagnetized at about 550℃ of temperature. The most characteristic change in magnetic properties on heating up to about 550℃ is a significant decrease in magnetic coercivity. This observation is consistent with the results obtained from chondrites. The paramagnetic component in lamellar tetrataenite, which is estimated by Mossbauer spectrum analyses, was not detected by conventional magnetic studies.