Read head including semiconductor spacer and long spin diffusion length nonmagnetic conductive material and method of making thereof

A read head, comprising:

• a first ferromagnetic layer;
• a second ferromagnetic layer;
• a first diffusion-assist nonmagnetic metallic layer located between the first ferromagnetic layer and the second ferromagnetic layer;
• a second diffusion-assist nonmagnetic metallic layer located between the first ferromagnetic layer and the second ferromagnetic layer;
• and
• a semiconductor spacer layer located between the first diffusion-assist nonmagnetic metallic layer and the second diffusion-assist nonmagnetic metallic layer;
• wherein each of the first diffusion-assist nonmagnetic metallic layer and the second diffusion-assist nonmagnetic metallic layer comprises a metal selected from Ag, Au, Cu, or Ti;
• and
• wherein the semiconductor spacer layer comprises a material selected from copper-indium-gallium-selenide, copper-indium-selenide or copper-gallium-selenide.