Hysteresis loop (B versus H) for steel needle in a spiral with 1 Hz sinusoidal excitation in H. Also shown are hysteresis loops for two cases of damped sinusoidal 1 Hz excitations (damping ratio of about .2). The two cases correspond to different amplitudes for the damped oscillatory excitations. This figure shows how a steel needle can be left in different directions of polarizations following damped oscillatory excitation.

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