Difference between ascending and descending curve hysteresis
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d(DM)/dH curves (DM is the difference between ascending and descending M(H) curves for H ! 0) of ZFC loops obtained at different temperatures for sample S 2 at: T ¼ 293 K; T ¼ 80 K, T ¼ 30 K, and T ¼ 10 K. Arrows signal the humps maximum. (*) indicates maxima superposition for 80 and 30 K curves.
According to Tauxe et al. 35 (and references therein), it is possible to distinguish between different causes of loop distortion as the derivative d(DM)/dH, where DM is the dif- ference between ascending and descending M-H curves for H ! 0, is not sensitive to SP but sense phases carrying differ- ent remanence; each hump in the d(DM)/dH, curve means a different coercivity contribution to the loop. Figure 11 dis- plays the d(DM)=dH vs H curves for all ZFC loops corre- sponding to S 2 sample. We observe that both the RT and 80 K d(DM)=dH vs H curves show only one hump, but incip- ient departures of background at higher fields are also observed in the 80 K one.