Nonmagnetic layers

Inset of Fig. 1 shows the high correlation between the electrical measured GMR (TMR) and the optically measured MRE for CoFe/Cu and CoFe/AljOs multilayers. The differences in the nonmagnetic layer (Cu or AI2O3) lead to different values of the magnetoresistive effect. 

Fig. 7.46 HRTEM picture taken on the Ni-Cu(3.8 nm)/Cn(1.4 nm) sample which shows the atomic structure of a twin boundary (indicated by the arrow) andthemagnetic/nonmagnetic layers (Reprinted from Ref. [5] with kind permission from Springer)...

Two other methods, multiple layer and evaporation, are in production use today. Multiple layer coating is a proprietary method capable of coating, as the name implies, multiple layers on a single base film. The layers can be coated at the same time and be of different formulations. The different layers, then, can serve different pmqjoses in the recording process. Nonmagnetic layers are also possible. 

Studies on Magnetic Multilayers and Interfaces 5.6.1 Spin Polarization in Nonmagnetic Layers... 

---