Magnetization remanent

Signal of remanent magnetization of small iron particle. Mass is approximately lOmg.Lift off is 4mm. 

Particulate Materials. There are three principal classes of particulate magnetic materials y-ferric oxide, y-Fe202, and its modifications chromium dioxide [12018-01 -8] and iron [7439-89-6]. A comparison of the remanent magnetization, and coercivity, for several y-Fe202... 

Maps of the remanent magnetic domain pattern in the near-surfiice region of magnetic material and thin films can be made routinely. 

This clearly shows that, for a given saturation magnetization, the remanence magnetization, Mr, markedly varies with the orientation of the applied field. This change is at-... 

Yamazaki, T, Katsura, I. and Marumo, K. (1991) Origin of stable remanent magnetization of siliceous sediments in the central equatorial Pacific. Earth Planet. Sci. Lett., 105, 81—93. 

Hysteresis curves for a magnetically hard and a magnetically soft ferromagnetic material. S = saturation magnetization, R = remanent magnetization, K = coercive force... 

Remanent magnetization is the magnetization that remains after the magnetic field has been switched off. 

The magnetite crystals are well developed (euhedral), and this ensures that they act as single magnetic domains (SD) and produce remanent magnetization in sediments. The average number of magnetite crystals/cell in 220 cells of the microaero-... 

The discovery that certain metalloxo clusters can sustain a remanent magnetization prompted interest in the synthesis of new single-molecule magnets as potential media for high-density information storage. Unfortunately, the broad... 

Archaeomagnetism can be considered a branch of Paleomagnetism specifically devoted to the dating of archaeological materials from the measurement of the remanent magnetization achieved by the iron oxide impurities present in clay after cooling of the ceramic artifact. This recording mechanism primarily provides information on the direction of the Earth s field at the time the artifact was fired or the kiln was last used. 

Fig. 9. Magnetic field dependence of the magnetization at selected temperatures for a 150-nm thick Ga xMn As film with a Mn composition x = 0.03S. The magnetic field is applied parallel to the sample surface (direction of magnetic easy axis) except for the closed circles at 5 K taken in perpendicular geometry. The solid line for S K shows the magnetization determined from transport measurements. The upper left inset shows a magnified view of the magnetization in the parallel field at 5 K. The lower right inset shows the temperature dependence of the remanent magnetization (Ohno et al. 1996a).

Fig. II. (a) Temperature dependence of the magnetization for 200-nm thick Ga, MnrAs with x =0.053. The magnetic field is applied perpendicular to the sample surface (hard axis). The inset shows the temperature dependence of the remanent magnetization (0 T) and the magnetization at 1 T in a field parallel to the film surface, (b) Temperature dependence of the saturation magnetization determined from the data shown in (a) by using ArTott plots (closed circles). Open circles show inverse magnetic susceptibility and the Curie-Weiss fit is depicted by the solid straight line (Ohno and Matsukura 2001).

Fig. 36. (a) The structure of a light emitting diode for detection of electrical spin-injection, (b) Relative change in light polarization A P as a function of the magnetic held at four different temperatures. Inset compares the remanent magnetization as determined by SQUID magnetomery with the remanent A P (Ohno et al. 1999). 

The saturation magnetization Ms is a specific constant for the material and for magnetic iron oxides is principally determined by the Fe2 + ion content. The ratio of remanent magnetization to saturation magnetization (Mr/Ms) for the tape depends mainly on the orientation of the pigment needles with respect to the longitudinal direction of the tape, and should approach the theoretical maximum value of unity as closely as possible. 

Figure 2 shows the two hysteresis loops for a medium and a head material. The coercivity, FT, the saturation magnetization, M or induction, Bs, remanent magnetization, M or induction, B and the permeability, JJ, differ for the two materials. 

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