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The resistance vs magnetic field loop for an MTJ ring with exchange bias. Inset is a scanning electron microscope image of the ring.
The magnetic field dependence of the MTJ ring resistance (a) and the normalized octave noise at 4.8 Hz (b). The lines show the noise peaks, and the numbers refer to the configurations in Figs. 3 and 4. The inset shows a time sequence of RTN at a noise peak.
Schematic magnetization configurations for magnetic states of the pinned (a) and free [(b)–(f)] CoFeB layers in MTJ rings obtained as the field is scanned from positive to negative. The schematic is based on micromagnetic simulations using the OOMMF code (see Ref. 15).
[(a) and (b)] show the power spectral density of the noise as a function of frequency at , taken in different magnetic states marked in Fig. 2(a). (c) Shows the magnetic Hooge parameter plotted as a function of sensitivity; the line is a fit to the data.
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