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Dependence of magnetics, microstructures and recording properties on underlayer thickness in CoNiCr/Cr media

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5 Author(s)
Yogi, T. ; IBM Almaden Res. Center, San Jose, CA, USA ; Gorman, Grace L. ; Hwang, Cherngye ; Kakalec, Michael A.
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The effect of Cr underlayer thickness on the magnetic, microstructural, and recording properties of sputtered CoNiCr media is reported. Cr thickness was varied from 100 to 2000 Å while the magnetic layer was maintained in the range of 260-300 Å. Measurements using a vibrating sample magnetometer show a monotonic enhancement of coercivity from 600 to 1500 Oe with increasing Cr thickness. Media noise was measured as a function of transition density using a spectrum analyzer. The media noise power at 2400 flux changes per millimeter decreased by a factor of about 10 with the increase in Cr thickness. This reduction is accompanied by a reduction in the coercivity squareness and the development of granular features in CoNiCr grains growing on the columns of the Cr underlayer. These features are consistent with a reduction of exchange coupling among CoNiCr grains

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Magnetics, IEEE Transactions on  (Volume:24 ,  Issue: 6 )