All ferromagnetic materials that have been magnetically saturated may retain a certain amount of magnetization called the:

The retention of a certain amount of magnetization in ferromagnetic materials, even after the external magnetic field has been removed, is referred to as residual magnetism. This phenomenon occurs due to the alignment of magnetic domains within the material, which can become 'locked' in a particular orientation after the material has been magnetically saturated.

Residual magnetism is significant because it can affect various applications, such as in the manufacturing of permanent magnets or in the assessment of materials using non-destructive testing methods like magnetic particle inspection. It indicates the ability of a material to hold a magnetic charge and is a crucial concept in understanding the magnetic properties of ferromagnetic materials in engineering and material science.

The other terms, while related to magnetism, describe different concepts: coercive force pertains to the intensity of the magnetic field required to demagnetize a material, the hysteresis loop represents the relationship between magnetization and applied magnetic field and illustrates energy loss during magnetization and demagnetization cycles, and hysteresis loss refers specifically to the energy lost due to these cycles.