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 (H AF) with a constant decrement (ΔH AF/cycle) simultaneously with a steady, unidirectional DC field (H DC). 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 H DC but the intensity will depend on the amplitudes and relative orientations of the AF and DC fields. The maximum ARM intensity occurs when H AF and H DC are parallel. For a standard laboratory experiment, H DC ≪ H AF with H AF = 100–200 mT and H DC = 0.05–0.1 mT. H DC is also referred to as a bias field because it produces a statistical preference or biases the direction of ARM along H DC. A special case of ARM is a partial ARM (pARM) produced by a DC field applied...
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Moskowitz, B.M. (2007). Magnetization, Anhysteretic Remanent. In: Gubbins, D., Herrero-Bervera, E. (eds) Encyclopedia of Geomagnetism and Paleomagnetism. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4423-6_189
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