access icon free Pinched hysteresis loops and symmetry

Pinched hysteresis loops (PHLs) can be clockwise, counter-clockwise, self-crossing and non-self-crossing. While it is difficult to differentiate these features from the measured PHLs on the oscilloscope, this study shows that PHL exhibits different forms of symmetry. Self-crossing PHLs display reflection symmetry and non-self-crossing ones display point symmetry. These features are confirmed with practical measurements based on the memristor characteristics of Hewlett-Packard (self-crossing) and of a discharge lamp (non-self-crossing). It is shown that the symmetry graph is a useful tool to identify the features of PHLs.

Inspec keywords: magnetic hysteresis; oscilloscopes; memristors

Other keywords: pinched hysteresis loops; point symmetry; Hewlett-Packard; symmetry graph; memristor characteristics; self-crossing PHL; reflection symmetry; oscilloscope; discharge lamp; nonself-crossing PHL

Subjects: Resistors; Magnetization curves, hysteresis, Barkhausen and related effects; Display, recording and indicating instruments

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