Encyclopedia of Geomagnetism and Paleomagnetism

2007 Edition
| Editors: David Gubbins, Emilio Herrero-Bervera

Magnetization, Anhysteretic Remanent

  • Bruce M. Moskowitz
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4423-6_189

Anhysteretic remanent magnetization (ARM) is a magnetization an assemblage of magnetic particles acquires when it is subjected to an alternating field (AF) of gradually decreasing amplitude (HAF) with a constant decrement (ΔHAF/cycle) simultaneously with a steady, unidirectional DC field (HDC). The ARM is measured when both AF and DC fields are zero. Typically, the DC field is maintained while the AF is slowly ramped down to zero, and then reduced to zero. For isotropic samples, the direction of the ARM is parallel to HDC but the intensity will depend on the amplitudes and relative orientations of the AF and DC fields. The maximum ARM intensity occurs when HAF and HDC are parallel. For a standard laboratory experiment, HDCHAF with HAF = 100–200 mT and HDC = 0.05–0.1 mT. HDC is also referred to as a bias field because it produces a statistical preference or biases the direction of ARM along HDC. A special case of ARM is a partial ARM (pARM) produced by a DC field applied only for a...

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  • Bruce M. Moskowitz

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