Open AccessRapid Demagnetization of Palaeomagnetic Samples using a Rotating Magnetic Field
Author(s) -
Noël Mark,
Molyneux L.
Publication year - 1975
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1975.tb06210.x
Subject(s) - demagnetizing field , rotation (mathematics) , twist , magnetic field , field (mathematics) , rotating magnetic field , geology , geophysics , physics , mechanics , geometry , magnetization , mathematics , quantum mechanics , pure mathematics
Summary An instrument has been constructed in which efficient multiaxis demagnetization of separate samples or long cores is achieved by passing the specimen in a twisting manner through a rotating magnetic field so that the axes of twist and rotation of the field are orthogonal. The rotating field is created by driving three coils, whose axes are 120° apart, from the three phase electricity mains supply. Experiments show that the system is as least as effective as conventional means for both long core and separate samples. For separate samples where a direct comparison can be made with conventional apparatus, demagnetization can be done in one tenth of the time normally needed.