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Magnetic images obtained by using the magnetoresistive reader after having scanned the write head over the media for different values of the write current. The proportion of reversed bits can be compared to the magnetization of the array measured by classical magnetometry tools.
Major hysteresis loop measured by polar magneto-optical Kerr effect (squares) compared to the one deduced from Fig. 1 and measured with the magnetoresistive head (circles).
(a) Density plot of the readback signal from the head. All dots (in white) present the same contrast as in the initial state meaning that the write current was not large enough to reverse the central bit. (b) The contrast of the central dot has changed. The current was large enough to reverse its magnetization. (c) The central dot presents an unstable bi-domain state of the magnetization.
Write current as a function of pulse width. The discontinuous line is a guide to the eye. The three different symbols correspond to the different pulse generators. A higher bandwidth head was used for the measurements below (explaining the drift in the current value at between the two heads). Inset: current pulse plots and wide.
Evolution of the dynamic coercive field as a function of the pulse width (squares). The continuous line is a fit according to Eq. (1).
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