Original: Types of GMR Multilayer GMR In multilayer GMR two or more ferromagnetic layers are separated by a very thin (about 1 nm) non-ferromagnetic spacer (e.g. Fe/Cr/Fe).
Simplified: Types of GMR Multilayer GMR In multilayer GMR two or more ferromagnetic layers are separated by a very thin (about 1 nm) non-ferromagnetic layer (e.g. Fe/Cr/Fe).