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Saw-tooth pattern from flux jumps observed by high resolution curves in thin films
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Remanent parts of magnetic hysteresis loops for temperatures from 2 to 11 K. Results from 4 to 11 K are shifted to upward by 0.01 emu. (b) shows the sharp saw-tooth pattern at 2 K for applied fields between −50 and 50 Oe with sweeping rate of 5 Oe/s and the data-acquisition time interval of 0.1 s. The and the are defined in (b). (c) shows the flux jump in the loop measured by using the conventional SQUID magnetometer at 5 K (Ref. 18). Due to the fewer data points, the real shape of saw-tooth pattern is not captured.

Image of FIG. 2.
FIG. 2.

Distribution of in different field intervals at (a) 2 K, (b) 4 K, and (c) 6 K. The maximum and the minimum of increase with increasing applied field. Bars in figures indicate the distribution of the . Black lines in figures are results from the calculation.

Image of FIG. 3.
FIG. 3.

(a) Different jump patterns in the magnetic hysteresis loop at 8 K. The black arrow identifies the transition from a sharp saw-tooth pattern to a rounded one. (b) The pattern diagram illustrates the sharp saw-tooth region, the rounded saw-tooth region, and the no-flux-jump region. (c) The line is curves at 10 K without flux jumps. Result from 10 K is drawn to indicate the hysteresis loop without flux jumps.

Image of FIG. 4.
FIG. 4.

Temperature dependence of the size of the flux jump .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Saw-tooth pattern from flux jumps observed by high resolution M-H curves in MgB2 thin films