MAS-MAMR – Microwave Assisted Switching Microwave-Assisted Magnetic Recording. This is the use of resonance-enhanced magnetic oscillations between a spin-torque oscillator (STO) in the disk drive’s read/write head and the recording medium. The stronger oscillations facilitate writing data in narrower tracks in the media. MAS-MAMR drives capacity gains higher than FC-MAMR.

MAS-MAMR diagram.