Magnetic steel sheet having a layer improving the electrical insulation and method for the production thereof

A steel sheet, comprising:

• a magnetic steel sheet core;
• a diffusion zone formed at a side of the magnetic steel sheet core, the diffusion zone including a metal diffused into the diffusion zone in a direction toward an internal area of the magnetic steel sheet core, the metal comprising titanium or tantalum;
• wherein the diffusion zone includes more than fifty percent by weight of the metal up to 2 μm from an exterior side of the diffusion zone facing away from the internal area;
• and
• a metal oxide layer formed at the exterior side the diffusion zone, such that the diffusion zone is located between the metal oxide layer and the internal area of the magnetic steel sheet core,
• wherein the metal oxide layer comprises an associated metal oxide of the metal in the diffusion zone,
• the diffusion zone comprises a remaining residual content of the metal, and
• the concentration of the metal in the diffusion zone decreases from 100% by weight at an interface with the metal oxide layer to 0% by weight in the direction extending toward the internal area of the magnetic steel sheet core.