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Micro Wave Technology delivers higher storage densities in hard disks MAMR-Microwave Assisted Magnetic Recording technology Operation of MAMR MAMR applies microwave and magnetic fields to a recording medium to generate ferromagnetic resonance (FMR), i.e., the magnetic interaction with the magnetization of a recording medium, inducing a substantial precession of its magnetization. As a result, MAMR makes it possible to reverse the magnetization of the recording medium with a lower magnetic field than in the case of the conventional magnetic recording. Therefore, MAMR write heads require an additional device to generate a microwave field while MAMR media need to interact with a microwave field properly.