We have developed the core HRM series that uses metal materials with high resistance. The HRM series has a higher saturation magnetic flux density than ferrite and is excellent in strength, making it suitable for use as a core material for small, high-current inductors. It uses materials with excellent heat resistance and does not contain resin, so it can be used in high temperature environments. In particular, it is suitable for the core material of small inductors for smartphones and in-vehicle devices in the high current range, contributing to system miniaturization.