IntroductionIt has been shown that electromagnetic interference (EMI) from a remote ESD- induced spark can damage giant magnetoresistive (GMR) heads [1]. In order to be susceptible to damage from EMI, the GMRhead needs to be in very close proximity(o30 cm) to a strong ESD source (>500 V) and have additional wires of some length(>10 cm) attached to it in order to create an antenna.An interesting question is whether the electromagnetic emission from mobile cell phones is also capable of inducing damage to GMRheads. The purpose of this study was to determine whether operation of cell phones in the proximity of the GMR head gimbal assembly (HGA) could damage GMR heads or otherwise influence GMRhead testing.
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