EAMR – Energy-Assisted Magnetic Recording – a disk drive recording technology in which energy, in the form of microwaves or heat, is applied to a magnetic recording medium which is resistant to having its polarity changed at room temperature. This is known as having high coercivity. The applied energy lowers the coercivity while the energy is applied, making it easier to write data to the medium, change its polarity in other words. Once the energy is withdrawn the coercivity returns to its previous high state and the polarity, and hence bit value, remains stable. See MAMR and HAMR.