Giant magnetoresistance effect is widely used in high-density read heads and magnetic storage elements. With the development of technology, when the magnetic area for storing data becomes smaller and smaller, the density of storing data becomes larger and larger, which puts forward higher requirements for the read-write head.
The increase or decrease of the current in the giant magnetoresistance material can be defined as the sum of 0 of the logic signal 1, thus reading the magnetic memory device. Giant magnetoresistance materials can output data stored by magnetic methods with different currents, and even if the magnetic field is small, they can output enough current changes to identify data, thus greatly improving the data storage density.
Giant magnetoresistance effect has been successfully applied to hard disk production. 1994, IBM successfully developed a read head with giant magnetoresistance effect, which increased the recording density of the disk by 17 times, thus making the disk return to the leading position in the competition with the optical disk. At present, GMR technology has become the standard technology for almost all computers, digital cameras and MP3 players.