A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory? Explain the meaning of this statement.

Explanation

(c) When external magnetic field applied on ferromagnetic sample with net magnetic field zero, is increased gradually and then decreased to its initial value, the domains in that sample do not return completely to their original configuration but retains some magnetic field called residual or remanent magnetic field as its "memory.. of past. From this remanence value, we can come to know about no. of hysterisis cycles repeated by given ferromagnetic sample. Such memory given ferromagnetic sample. Such memory magnetic storage of information on tapes of cassettes and on the disks of computers. The no. of bits in the information signal can be related to no. of hysterisis cycles repeated and that is how, ferromagnetic sample is used as a memory storage device.