Patent ID: 8723633

Claim:
A magnetic core comprising: a first core having a recess; and a second core having a first end portion and a second end portion both held in contact with the first core, the second core forming a closed magnetic path with the first core, wherein the second core comprises a material having a lower magnetic permeability and a higher saturation magnetic flux density than a magnetic permeability and a saturation magnetic flux density of the first core, the second end portion includes a distal end surface having a cross-sectional area larger than a cross-sectional area of the first end portion in a direction perpendicular to a direction in which a magnetic flux flows in the closed magnetic path, the distal end surface of the second end portion is held in contact with the first core, and the first end portion is engaged with the recess in the first core, the first end portion has a distal end surface and a side surface, which is perpendicular to the distal end surface of the first end portion, and the first end portion is held in contact with the first core at the distal end surface and the side surface of the first end portion, and a cross-sectional area of the first core is greater than a cross-sectional area of the second core at a longitudinal middle.