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Energy-assisted magnetic recording
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Energy-assisted magnetic recording (EAMR) is a disk drive recording technology which use energy (microwaves - MAMR or heat - HAMR) to increase the areal density (a higher BPI value) during writing operations by improving writability. To lower the resistance of the storage medium for having its polarity changed (high coercivity), energy is applied on the recording head: electrical current in ePMR (energy-assisted perpendicular magnetic recording), a laser source for heating temporarily the disk material (HAMR), a spin-torque oscillator (STO) for microwaves (MAMR). Further reading * https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/collateral/tech-brief/technology-brief-energy-assisted-magnetic-recording.pdf |
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