Magnetic loop array

To measure the current distribution in a hydrogen PEFC, Brown et al. ° and Cleghorn et al. ° employed the printed circuit board approach using a segmented current collector, anode catalyst, and anode GDL. This approach was further refined by Bender et al. ° to improve ease of use and quality of information measured. Weiser et al. ° developed a technique utilizing a magnetic loop array embedded in the current collector plate and showed that cell compression can drastically affect the local current density. Stumper et al."° demonstrated three methods for the determination of current density distribution of a hydrogen PEFC. First, the partial membrane elec-... 

Alternatively, a noncontact magnetic loop array containing Hall sensors can be used to measure the current density distribution [55-57]. Each segment of this array consists of an electric conductor inducing a voltage within a ferromagnetic ring. 

Let us consider the condition for thermal stability of the patterned-media with perpendicular anisotropy, based on a perpendicular M-H loop [28], The net M-H loop for a dot array is the statistic result of small Stoner-Wohlfarth model like square M-H loops of each magnetic dot. The thermally stable condition for a magnetic dot array is just that of the condition for a dot, which is the easiest to reverse among the whole dots. Using the beginning field of the reversal, namely, the nucleation field of the magnetic dot array, H, the condition is expressed as. 

FIGURE 12. In-plane hysteresis loops of self-assembled [Pto.47Feo.53]8sAgi2 (solid line) and Fe53Pt47 (dotted Une) nanoparticle arrays annealed at different temperatures H = field strength, M = magnetization, Mg = saturated magnetization) . Reproduced from Reference 96 by permission of the American Institute of Physics... 

A thin wire bent into a closed contour is called a loop antenna. The terminals of a loop antenna are formed by a small discontinuity or gap in the conducting wire. Loops have been used in such diverse applications as radio receiving antennas, direction finding, magnetic field-strength probes, as well as array elements. 

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