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Fe-Hf-N Soft Magnetic Film for Magnetoresistive Head Biasing

IP.com Disclosure Number: IPCOM000118133D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Gill, HS: AUTHOR [+2]

Abstract

Magnetoresistive recording head with Soft Adjacent Layer (SAL) bias is commonly used for data storage applications. The read back sensitivity of this head is an important function of the product of magnetization and electrical resistivity of the SAL. The higher product of magnetization and electrical resistivity reduces the sense current shunting through the SAL and as a result gives higher read back sensitivity. It is found that the Fe-Hf-N alloy film exhibits about a factor of ten improvement in the product of magnetization and electrical resistivity over a commonly used NiFeCr alloy film. This improvement results in about 50% improvement in the magnetoresistive coefficient. The magnetic, electrical, and magnetoresistive properties of the Fe-HfN film are compared with other soft films in Table 1 and Table 2.

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Fe-Hf-N Soft Magnetic Film for Magnetoresistive Head Biasing

      Magnetoresistive recording head with Soft Adjacent Layer (SAL)
bias is commonly used for data storage applications.  The read back
sensitivity of this head is an important function of the product of
magnetization and electrical resistivity of the SAL.  The higher
product of magnetization and electrical resistivity reduces the sense
current shunting through the SAL and as a result gives higher read
back sensitivity.  It is found that the Fe-Hf-N alloy film exhibits
about a factor of ten improvement in the product of magnetization and
electrical resistivity over a commonly used NiFeCr alloy film.  This
improvement results in about 50% improvement in the magnetoresistive
coefficient.  The magnetic, electrical, and magnetoresistive
properties of the Fe-HfN film are compared with other soft films in
Table 1 and Table 2.

      In addition to excellent magnetic and electrical properties,
FeHfN alloy film also exhibits good thermal stability and corrosion
resistance.  The higher thermal stability of this alloy allows higher
temperature fabrication process for the magnetoresistive sensor.  As
shown in Table 2, the improvement in magnetoresistive coefficient
after 300C anneal is higher for the sensor structure with the FeHfN
alloy SAL.