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CoHfNb/Al2O3 Laminated Write Pole for an Integrated Spin Valve Giant Magnetoresistive Read Inductive Write Head

IP.com Disclosure Number: IPCOM000118596D
Original Publication Date: 1997-Apr-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Gill, HS: AUTHOR

Abstract

As data rate for the magnetic recording system increases, the strength of the write head fringing field decreases. The writing efficiency of the head, therefore, decreases with increase in operating frequency of the recording system. This loss in write efficiency has been shown to be due to increase in eddy currents at higher operating frequency. It is possible to significantly improve the write efficiency by using high electrical resistivity write pole made out of Co-based amorphous alloy. It is also known to minimize the eddy current loss by forming laminations of magnetic material with nonmagnetic material.

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CoHfNb/Al2O3 Laminated Write Pole for an Integrated Spin Valve Giant
Magnetoresistive Read Inductive Write Head

      As data rate for the magnetic recording system increases, the
strength of the write head fringing field decreases.  The writing
efficiency of the head, therefore, decreases with increase in
operating frequency of the recording system.  This loss in write
efficiency has been shown to be due to increase in eddy currents at
higher operating frequency.  It is possible to significantly improve
the write efficiency by using high electrical resistivity write pole
made out of Co-based amorphous alloy.  It is also known to minimize
the eddy current loss by forming laminations of magnetic material
with nonmagnetic material.

      CoHfNb amorphous alloy has excellent properties for the write
pole of the integrated spin valve read/inductive write head for the
data storage application.  Its electrical resistivity is greater than
100 microOhmCm, saturation flux density near 13 KG, and
magnetostriction constant near zero.  CoHfNb alloy or its laminations
with Al(2)O(3) also  possess soft magnetic properties without
requiring high temperature anneal.  In addition, CoHfNb alloy has the
potential to exhibit soft magnetic properties for the material
deposited over non-planar surface,  such as the trailing pole of the
write head which covers large steps in underlying photoresist.  Most
of the other write pole material candidates, e.g., Fe-N, CoFe,
Ni(45)Fe(55...