4); Q = Koenigsberger ratio; D and I = declination and inclination of the natural remanent magnetization
The modified montmorillonite (MMt) exhibits higher saturation magnetization and markedly lower values of the remanent magnetization
and coercivity (Table 4).
The influence of the extent of remanent magnetization
[B.sub.r] and the application of an iron magnetic circuit can be further specified with reference to the dependence in Figure 8 (Zezulka, 2010), measured on the same assembly 3 but with the N45 material of the magnets with [B.sub.r] = 1.354 T, identical with the material of assemblies 1 and 2.
So far, provenance studies applying rock magnetic properties have comprised measurements of the susceptibility and intensity of natural remanent magnetization
of pottery samples, saturation isothermal remanence (SIRM) and anystheretic remanent magnetization
(ARM) intensities (McDougall et al., 1983).
On Earth remanent magnetization
most commonly occurs when hot volcanic rocks become cool enough to reach the Curie point, the temperature at which the signature of the magnetic field at that time is "frozen in." Right now, Mars lacks an internally generated magnetic field, so the crustal anomalies most likely represent remanent magnetism induced in the distant past.
Magnetic susceptibility, saturation isothermal remanent magnetization
, natural remanent magnetization
, electrical resistivity, dielectric constant, wet P-wave velocity, effective porosity, and wet, dry and grain densities were measured in the Petrophysical Laboratory of Research Institute of Earth Crust of St.
The saturation magnetization, coercivity, and remanent magnetization
are obtained from hysteresis loop.
The remanence (e.g., natural remanent magnetization
(NRM)) was measured using either the AGICO JR-6A spinner magnetometer or 2G Superconducting Rock Magnetometer 755 (SQUID), and the magnetic susceptibility ([chi]) was checked with the AGICO KLF-4A Automatic Magnetic Susceptibility Meter.
Figure 5 shows the hysteresis loop of the assynthesized powder that exhibits a low remanent magnetization
value similar to superparamagnetic behavior.
Figure 5 shows that the coercivities are [H.sub.c||] = 222.6 and [H.sub.c[perpendicular to]] - 80.5 Oe (1 Oe = [[10.sup.3]/4[pi]] A*[m.sup.-l]), and the saturated magnetization ([M.sub.s]) and remanent magnetization
([M.sub.r]) are 0.0610 and 0.0095 emu for the applied magnetic field perpendicular to the Ni nanotubes, and 0.0559 and 0.0066 emu for the applied magnetic field parallel to Ni nanotubes, respectively.
Natural remanent magnetization
(NRM) is an important required characteristic.