Magnetic carrier for electrophotographic developer and process for producing the same, and two-component system developer

A magnetic carrier for an electrophotographic developer comprising spherical magnetic composite particles comprising a phenol resin as a binder and ferromagnetic iron oxide particles bonded to each other through the phenol resin, and further comprising on the spherical magnet particles a coating layer comprising at least one resin selected from the group consisting of a melamine resin, a silicone-based resin, a fluororesin, an acrylic resin and a styrene-acrylic resin,

• wherein the spherical magnetic composite particles before coating with the coating layer have a ten-point mean roughness Rz of 0.3 to 2.0 μm,
• a total content of the ferromagnetic iron oxide particles in the spherical magnetic composite particles is 80 to 99% by weight,
• the ferromagnetic iron oxide particles are constituted from ferromagnetic iron oxide particles (a) and ferromagnetic iron oxide particles (b) which are different in average particle diameter from each other,
• a ratio of an average particle diameter (ra) of the ferromagnetic iron oxide particles (a) having a larger average particle diameter to an average particle diameter (rb) of the ferromagnetic iron oxide particles (b) having a smaller average particle diameter (ra/rb) is more than 1,
• a content of the ferromagnetic iron oxide particles (a) is 1 to 50% by weight based on a total amount of the ferromagnetic iron oxide particles (a) and the ferromagnetic iron oxide particles (b), and
• the ferromagnetic iron oxide particles (a) and the ferromagnetic iron oxide particles (b) respectively have any shape selected from the group consisting of a spherical shape, a hexahedral shape, an octahedral shape, a polyhedral shape and an amorphous shape.