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Magnetoresistive sensors based on Ni81Fe19/Ag multilayers

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3 Author(s)
Mouchot, J. ; LETI, Grenoble, France ; Gerard, P. ; Rodmacq, B.

Because of their good magnetoresistive properties and thermal stability, sputtered NiFe/Ag multilayers (MLs) produce sensors with attractive characteristics. Thermal treatments up to 280°C are carried out. They lead to improved sensitivity; the magnetoresistance (MR) ratio remains practically constant, while the saturation field decreases from 24 kA/m to 6 kA/m after annealing. Sensors are made from these MLs using a microtechnology process. They are tested by reading magnetic tracks on a hard magnetic disk. Their performance is compared with sensors based on classical anisotropic MR in ferromagnetic 3-D alloys. The signal is found to be about ten times greater with this new ML than with sensors based on NiFe or NiFeCo alloys

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Magnetics, IEEE Transactions on  (Volume:29 ,  Issue: 6 )