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Table 1 Hysteresis parameters obtained from room-temperature measurements

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

Samples Weight (mg) Magnetite in M-HFn (mg) Magnetite in MSR-1 (mg) Ms (Am2kg−1) Mrs (Am2kg−1) Hc (mT) Hcr (mT)
M1 3.1 1.00 0 9.6 0 0 0
M2 15.5 1.98 0.38 4.1 0.07 1.8 15.7
M3 22.5 1.02 0.77 1.6 0.09 4.5 15.2
M4 12.8 0 0.51 0.3 0.11 9.6 15.2
  1. Ms, saturation magnetization; Mrs, saturation remanence; Hc, coercivity force; Hcr, remanence coercivity
  2. Calculation of magnetite mass in magnetoferritin (M-HFn)
  3. Wmagnetite = Cmagnetite × (4/3 × π × (d/2)3)
  4. Wferritin = Mferritin/NA
  5. where density of magnetite, Cmagnetite = 5.18 g/cm3; diameter of the magnetite core in magnetoferritin, d = 5.31 nm; molecular weight of ferritin, Mferritin = 509 kDa; Avogadro’s constant, NA = 6.02 × 1023