Question

when compare
mean free path
319) GIANT MAGNETO RESISTANCE (GMR)
SENSOR - SPIN VALVE
A device that woks on the principle of the GMR is a spin
valve. This device is used in magnetic hard discs for high density
data storage (Fig. 3.30 (a)). There are 4 layers altogether in a
spun valve (Fig. 3.80 (b)
re
Two ferro magnetic layers are separated by a thin spacer
Syer (Cu or Ru). One ferromagnetic layer is pinned its direction
of magnetization is fixed and is not distributed by changes in
Seld. This layer is pinned by adding a fourth layer: a strong anti
ferromagnet
Senwer head containing the CMR​

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