Hysteresis is Hysteresis is a familiar macroscopic phenomenon in the behavior of magnetic materials: When a sample is subjected to a varying external magnetic field, its magnetization curve does not, in general, retrace its steps as the external field in a fixed direction is swept from a large negative value to a large positive value and then back again. But until the summer of 1995, no one had ever seen quantum steps in a hysteresis loop.

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