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Hard Magnetic Materials. Soft Magnetic Materials. 1. Materials which retain their magnetism and are difficult to demagnetize are called hard magnetic materials. These materials retain their magnetism even after the removal of the applied magnetic field. Hence these materials are used for making permanent magnets.n permanent magnets the movement of the domain wall is prevented. They are prepared by heating the magnetic materials to the required temperature and then quenching them. Impurities increase the strength of hard magnetic materials. Soft magnetic materials are easy to magnetize and demagnetize.
10 most extreme places on Earth. A soft key is a key on a computer or cell phone that can be programmed to perform multiple different functions of the userâs choosing. Most keys, including letters on computer keyboards and numbers on cell phones, are considered âhard keysâ because they cannot be reprogrammed.n this instance, the numeral key is acting as a soft key because it has been programmed by the user to perform a specific task. The term has a slightly different meaning on smartphones with touch screen keyboards or keyboards that appear graphically on the screenâs display device, rather than being fixed buttons.