Field-cooled susceptibility curves

Fig. 5.7 (A) TEM micrograph of silica-alginate-Co hybrid nanocomposites and (B) corresponding Zero Field Cool-Field Cool (ZFC/FC) susceptibility curves (H = 500 0e) indicating superparamagnetic behavior (Adapted from [34]).

Fig. 3 (a) Temperature variation of x of [C4NjHi2][NH4l2[Mn"jF6(S04)2], I under ZFC conditions (ff = 100 and 1000 Oe). Inset shows the variation of inverse susceptibility, (b) Temperature dependence of the magnetic susceptibility of I under field-cooled (FC) and zero-field-cooled (ZFC) conditions (100 Oe). Inset shows the M-H curve at 5 K. 

The result for a typical high quality crystal is shown in Fig. 5, where the data were taken with the field parallel to the c axis, that is, normal to the plane of the platelet. Data were taken by cooling in zero field, then applying a field of 10 Oe and measuring the susceptibility on warming (denoted zfc, for zero-field-cooled), and also by cooling in an applied field (fc). The curves are often referred to as exclusion and expulsion, respectively, or shielding and Meissner curves, respectively. The ratio between the low-temperature ( T -> 0)... 

Figure 14 In (a) is shown the variation of the susceptibility with temperature for a Bi2Ca2Mn06+y crystal obtained while warming the sample in a field of 500G after having cooled the sample in zero field. The magnetization vs. field curve measured at 10K on the same sample is shown in (b).

Fig. 62. Inverse of the susceptibility, x HIM, of AgMn 10.6 atom% as a function of temperature for various magnetic fields (indicated on each curve in G). Data points were obtained by slow cooling in constant field H. The onset of the plateau (marked by arrows) is defined arbitrarily by the point of the M T) curve departing by 3% from its low-temperature value. The resulting boundary for the spin-glass phase H T) is shown as an inset (from Monod and Bouchiat 1982).

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