WEBApr 1, 2023 · Hard Disk Drive read heads moved from GMR to Tunneling Magnetoresistive (TMR) Devices as a way to enhance head SNR in order to keep up with advanced linear densities. TMR technology was further extended by the transition from amorphous alumina tunneling barriers to crystalline MgO barriers lattice matched to adjacent BCC magnetic ...
WEBA method of testing acceleration to assess instability in GMR and TMR heads was developed. Head instability appears as the output of change in signal amplitude and/or signal distortion with spike noise in both heads.