Measurement of intensity of recorded magnetization on Co-Cr film by electron holography

Electron holography has excellent features that permit the direct observation of magnetic flux in micro regions and the quantitative measurement of the flux intensity. Using this method, the intensity of recorded magnetization on a Co-cr single layer medium is measured. As a result, it is revealed that the demagnetization factor, which is determined by the aspect ratio of the recorded bit cell, dominates the magnetization recorded in contact with a head. It is also learned that the spacing loss in the recording process is -160d/λ[dB).