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Table 2 Hysteresis parameters obtained from low-temperature measurements

From: Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite

Samples Hc (mT) Ms (Am2kg−1) Mrs (Am2kg−1)
5 K 10 K 20 K 5 K 10 K 20 K 5 K 10 K 20 K
M1 25.1 10.0 0 23.7 23.7 22.6 7.4 4.1 0.4
M2 25.1 10.0 0 10.9 10.8 10.8 3.4 1.9 0.3
M3 25.1 10.0 0 3.8 3.7 3.7 1.2 0.7 0.2
M4 70.3 65.3 50.2 0.4 0.4 0.4 0.2 0.2 0.2