Pressure effect on low-temperature remanence of multidomain magnetite: Change in demagnetization temperature

Details Pressure effect on low-temperature remanence of multidomain magnetite: Change in demagnetization temperature Pressure effect on low-temperature remanence of multidomain magnetite: Change in demagnetization temperature

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3904305s&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 4, CiteID L04305

Physics

Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Instruments And Techniques, Mineral Physics: High-Pressure Behavior, Mineral Physics: Instruments And Techniques

Scientific paper

We have conducted the first in-situ thermal demagnetization experiments on low-temperature remanences of magnetite under high pressure up to 0.7 GPa, to investigate the pressure dependence of the demagnetization temperature (Td) defined as rapid decreases in the remanences. A sample of multidomain magnetite particles was set up in the piston-cylinder-type high-pressure cell specially designed for an MPMS. We conducted zero-field warming (ZFW) on (1) saturation isothermal remanent magnetizations imparted at 20 K and (2) remanences given by field cooling from 300 to 20 K. Our measurements show a clear decrease in Td with pressure at a rate of -2.9 K/GPa, although a positive rate was inferred by the previous study. Combining with other transition data of physical properties, sharp declines in low-temperature remanences around 120 K during ZFW are considered as one of the physical property changes associated with the Verwey transition.

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