(a) Illustration of the macroscopic magnetism of an amorphous Tb₄₃Co₅₇ film. (b) Illustration of the microscopic magnetism of Tb₄₃Co₅₇. Magnetic moments of Tb and Co are oriented in anti-parallel to each other. Each magnetic moment consists of spin and orbital magnetic moments. (c) Solid curve: Macroscopic magnetic hysteresis loop measured using SQUID. Dark green circles: spin-specific magnetic hysteresis (SSMH) loop. Light green circles: orbital-specific magnetic hysteresis (OSMH) loop. The shape of the SSMH is different from that of the OSMH.