Electromagnetic Halbach array device with substantially contiguous vertical and horizontal cores. The device is equipped with horizontal cores having protrusions which establish substantial contiguity between horizontal and vertical cores.

Provided are an opposed iron core transmitting rotation motion, a manufacturing method thereof, and an electromagnetic fan clutch formed by the opposed iron core. The opposed iron core includes iron core grooves (12; 13) axially arranged in a back-to-back manner on an electromagnetic iron core body (11). The manufacturing method of the opposed iron core includes: directly drawing the iron core body (11) to form the iron core grooves arranged in the back-to-back manner, or directly spinning the iron core body (11) to form the iron core grooves arranged in the back-to-back manner. The electromagnetic fan clutch formed by the opposed iron core has a first actuation gap (841) and a second actuation gap (842) respectively on two sides of the electromagnetic iron core body (11) of an opposed iron core apparatus.

A chip electronic component may include: a magnetic body; and internal coil parts buried in the magnetic body. The magnetic body includes: a core layer including the internal coil parts; and upper and lower cover layers disposed on upper and lower portions of the core layer, respectively, the core layer having a level of magnetic permeability different from that of at least one of the upper and lower cover layers.