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Pulse shape, resolution, and signal-to-noise ratio in perpendicular recording

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3 Author(s)
Valcu, B. ; Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA ; Roscamp, Thomas ; Bertram, H.N.

The paper theoretically examines playback characteristics of a giant magnetoresistive (GMR) head for perpendicular recorded magnetization transitions with a soft underlayer. The magnetic scalar potential, calculated numerically by the finite-element method, is fitted to a simple formula involving geometry-dependent parameters. The reciprocity principle leads to the shape of the single pulse signal. For high permeability of the underlayer the pulse has an error function-type dependence on distance. Within this approximation, the paper derives simple formulas for the pulsewidth T50, D50, and transition-noise-limited signal-to-noise ratio

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Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 1 )