Antiphase domains and reverse thermoremanent magnetism in ilmenite-hematite minerals.
Examination of synthetic ilmenite-hematite samples by transmission electron microscopy has for the first time revealed the presence of well-defined antiphase domains and antiphase domain boundaries in this mineral system. Samples quenched from 1300 degrees C have a high density of domain boundaries, whereas samples quenched from 900 degrees C have a much lower density. Only the high-temperature samples acquire reverse thermoremanent magnetism when cooled in an applied magnetic field. The presence of a high density of domain boundaries seems to be a necessary condition for the acquisition of reverse thermoremanent magnetism.
Lawson
C A
CA
Nord
G L
GL
Dowty
E
E
Hargraves
R B
RB