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Deposition Process to Produce Anisotropic Sendust Films through Multilayer Lamination

IP.com Disclosure Number: IPCOM000108427D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 76K

Publishing Venue

IBM

Related People

Chen, MM: AUTHOR [+2]

Abstract

Sendust film has been used in many magnetic recording heads as pole-piece material. The most recent development is the use of sendust film as pole material in the metal-in-gap (MIG) heads primarily because of its relatively higher saturation moment and hardness compared to ferrite. The as-deposited sendust film, however, exhibits very poor magnetic properties of high coercivity and ill-defined anisotropy. To improve its magnetic properties, a post deposition annealing of 500 to 600~C is required. The high temperature process is undesirable because it creates potential problems, such as delamination, oxidation, and process complexity. It can also affect the device performance as reported for MIG heads which exhibit a pseudo gap phenomenon due to the interdiffusion of sendust and MnZn ferrite.

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Deposition Process to Produce Anisotropic Sendust Films through Multilayer Lamination

      Sendust film has been used in many magnetic recording heads as
pole-piece material.  The most recent development is the use of
sendust film as pole material in the metal-in-gap (MIG) heads
primarily because of its relatively higher saturation moment and
hardness compared to ferrite.  The as-deposited sendust film,
however, exhibits very poor magnetic properties of high coercivity
and ill-defined anisotropy.  To improve its magnetic properties, a
post deposition annealing of 500 to 600~C is required.  The high
temperature process is undesirable because it creates potential
problems, such as delamination, oxidation, and process complexity.
It can also affect the device performance as reported for MIG heads
which exhibit a pseudo gap phenomenon due to the interdiffusion of
sendust and MnZn ferrite.  For future recording head applications, it
is essential to have a sendust deposition process which does not
involve a high temperature treatment either during film growth stage
or after film deposition.  A process without high temperature
treatment allows sendust films to be used as pole-piece material for
thin film inductive heads and as shield material for magnetoresistive
sensors.

      A multilayer process is proposed to deposit sendust-based films
having excellent magnetic properties without the need of high
temperature treatment.  The process involves the deposition of
alternating NiFe/sendust multilayer films.  Permalloy is used here to
orient magnetically the sen...