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Hc measurement of microscopic regions on thin film magnetic disc using longitudinal Kerr effect

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5 Author(s)
Abe, K. ; Hitachi Ltd., Yokohama, Japan ; Fujimaki, S. ; Furusawa, K. ; Kataoka, H.
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A longitudinal Kerr magnetooptical microscope system with a read/write testing unit and a positioning unit was developed for nondestructive measurement of the coercive force (Hc) in thin-film magnetic disks. This system measures the magnetooptical hysteresis loop from an area 2-30 μm in diameter on a disk with a C/CoNi/Cr layer. The magnetic field strength at the disk surface was estimated from the coil current in a Weiss-type magnet. The absolute value of the field strength was calibrated by a Hall sensor. The actual Hc values were measured and compared with the result obtained by a vibrating sample magnetometer in order to determine the accuracy, which was found to be within 2%. It took 36 min. to complete the H c measurement at 144 points over a 5.25 in. disk for a mean spot size of 30 μm

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 5 )