1. When current is passed through a coil, a magnetic field is induced. Thus principle, called “electromagnetic induction” is used as a basic parameter in the storage device.
2. The ease with which the material can be magnetized is another parameter.
3. We know the soft magnetic materials are the magnetized which can easily be magnetized and demagnetized. Hence based on this parameter, a data can be stored and erased easily. Such magnetic materials are used in temporary storage devices.
4. Similarly we know hard magnetic materials cannot be easily magnetized and demagnetized easily. So, such magnetic materials are used in permanent storage devices.
5. In soft magnetic materials, the electrical resistance varies with respect to the magnetization and this effect is called magneto-resistance. This parameter is used in specific thin films systems.
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