soft magnetic composites can be used in ignition coil efficiency

SMC materials are made of iron powder particles coated with an electrically insulating layer and can be formed into complex shapes by means of powder metallurgy, thereby allowing three-dimensional magnetic circuit design. 

Advantages:
1. High power density by 3D magnetic flux
2. Lower eddy current  losses at high frequencies compared with lamination steel
3. Complex shapes can easily be made,which opens a wide scale for product design
4.SMCs save copper,Quick response,Fast and accurate drive,High-intensity operations
5.can be used in Linear Motor,General Motor,DC Brush Motor,Claw Pole Motor,
   Brushless DC Motor,ignition coil
6.SMCs can improve the motor/engine performance, and can reduce cost obviously.