Open AccessRotational remanent magnetization (RRM) and its high temporal and thermal stability
Author(s) -
Mahon S. W.,
Stephenson A.
Publication year - 1997
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1997.tb05654.x
Subject(s) - remanence , thermoremanent magnetization , natural remanent magnetization , demagnetizing field , magnetization , magnetite , rock magnetism , geology , paleomagnetism , mineralogy , condensed matter physics , magnetic field , geophysics , physics , paleontology , quantum mechanics
SUMMARY The time and temperature stability of various types of magnetic remanence has been measured in pottery samples containing magnetite and in a clay sample containing manganese ferrite. The time decay of rotational remanent magnetization (RRM), anhysteretic remanent magnetization (ARM) and a low‐field isothermal remanent magnetization (IRM) has been measured. While the decay of the last two remanences is easily measurable at about 2 and 19 per cent per decade of time, respectively, the decay of RRM is too small to be measured, being less than about 0.1 per cent per decade of time. Thermal demagnetization of thermoremanent magnetization (TRM), ARM and RRM indicates that RRM is also the most thermally stable. The implications of these experiments are that rocks which exhibit gyromagnetic effects such as RRM contain highly stable particles and therefore are likely to be most suitable for palaeomagnetism.