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Magnetic Measurements |
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Variable Field Translation Balance This instrument is built by Petersen Instruments
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This exciting new rock magnetic instrument is not just a CURIE BALANCE but an ultra sensitive variable field translation balance (MMVFTB) that can perform many different tasks. It can measure CURIE TEMPERATURES up to 800 deg C, VARIABLE TEMPERATURE (-180 to +800 deg C) IRM acquisition and BACK FIELD, and VARIABLE TEMPERATURE (-180 to +800 deg C) HYSTERESIS LOOPS, FORC DDIAGRAMS and MAGNETIC SUSCEPTIBILITY all fully automatically using our sophisticated windows software. It is an ideal instrument for research in Rock Magnetism and Environmental Magnetism and can measure weakly magnetic materials (sandstone, limestone, loess, soil etc). See the thermomagnetic and hysteresis curves of the same marine sediment consisting of calcareous microfiossils. Diamagnetism dominates the hysteresis curve at high magnetic fields. A low field of 0.063 Tesla was used to obtain the thermomagnetic curve and reduce the diamagnetic signal. |
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See also IRM acquisition curves at 15 and 300 deg C, a low
field (0.063 T) thermomagnetic curve, and hysteresis curves at 15 and 300 deg C The MMVFTB can be supplied in 2 forms, Electromagnet and
Solenoid versions. The new modified MMVFTB(E) uses an electromagnet
to generate the field (maximum field approximately 1.2 Tesla) and can measure
between -180 and +800 deg C with RMS noise of 10-6emu. Maximum sample weight 500mg It can
simultaneously measure the reversible and irreversible components of
magnetisation and their temperature dependence. An important feature that
allows the behavior of the remanence carriers to be separated from those that
do not carry a stable remanence. The MMVFTB(S) uses
a solenoid to generate a field of
0.32 Tesla and can measure between room temperature and +800 deg C
with RMS noise level of 10-6emu,. Maximum sample weight 2000mg. Additionally the MMVFTB(S) is
equipped with an alternating field demagnetiser and can automatically create
ARM’s and af demagnetise
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