THE DUALITY THAT RELATES MAGNETIC NOISE TO ELECTRIC SHOT-NOISE

Statistical treatment of the succession in time of the Barkhausen-nois e pulses shows that magnetic noise possesses characteristics that are similar to those of electric shot noise. On the other hand, the electr ic shot-noise intensity in a noisy component is known to be related di rectly to the square root of the de current through the component. Hen ce, it is intriguing to relate in the same manner the magnetic-noise f lux-fluctuations to a magnetic entity similar to the de current in the electric case. The present work is a successful attempt to demonstrat e that such relationship exists. This is attained by employing the dua lity that relates the time-derivative of the magnetic flux to the elec tric current. The magnetic noise measurements of commercially availabl e thin-film magnetoresistors confirm the applicability of the proposed approach. The noise was generated by exciting the magnetoresistors by an sc magnetic field along their easy axes. The level of the resulted flux time-derivative was changed by varying the excitation frequency.