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Improved Magnetic Alloy for Low Noise Medium

IP.com Disclosure Number: IPCOM000121621D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Ahlert, RH: AUTHOR [+3]

Abstract

An important consideration for Co-alloy thin-film media for magnetic recording is media noise associated with irregularity of the transition boundaries between bit cells. Considerable success has been achieved in reducing media noise through a variety of means. We summarize here our results for a new alloy system CoPtMo and compare recording performance to data for CoPtCr.

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Improved Magnetic Alloy for Low Noise Medium

      An important consideration for Co-alloy thin-film media
for magnetic recording is media noise associated with irregularity of
the transition boundaries between bit cells. Considerable success has
been achieved in reducing media noise through a variety of means.  We
summarize here our results for a new alloy system CoPtMo and compare
recording performance to data for CoPtCr.

      Films of CoPtMo on VrV or Mo underlayers were produced in an
RF-DC magnetron sputtering system on Si substrates at a pressure of
approximately 3 mTorr of Ar.  Values of Hc as high as 1200 Oe were
obtained CoPt12Mo20, somewhat higher than the 1000 Oe obtained for
CoPt12Cr20 prepared under similar conditions.  Recording measurements
were made in the usual fashion using a shielded magnetoresistive
recording transducer for readback.  The isolated pulse amplitude S0
divided by the integrated rms media noise voltage nm at various
transition densities is shown in the figure for both CoPt12Mo20 and
CoPt9Cr17 prepared under similar conditions.  It is clear that the
S0/Nm recording performance of the CoPtMo is comparable to that of
CoPtCr.  This shows that CoPtMo provides an alternative means to
obtain the low noise performance required in future magnetic
recording devices.