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Multilayer NiFe/Fe for Use as Magnetic Pole Material and or Shield in Tape Heads

IP.com Disclosure Number: IPCOM000103722D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 27K

Publishing Venue

IBM

Related People

Aboaf, JA: AUTHOR [+2]

Abstract

Laminated NiFe/Fe thick films deposited in nitrogen atmosphere can be used as pole tip materials for magnetic heads. These 2 to 4 microns laminates made of NiFe (100 to 300 o thick) and Fe (250 to 2000 o thick) are deposited by RF sputtering; the number of layers in the laminate can vary between 60 and 100 layers; they have good magnetic properties and have good wear properties.

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Multilayer NiFe/Fe for Use as Magnetic Pole Material and or Shield in Tape Heads

       Laminated NiFe/Fe thick films deposited in nitrogen
atmosphere can be used as pole tip materials for magnetic heads.
These 2 to 4 microns laminates made of NiFe (100 to 300 o thick) and
Fe (250 to 2000 o thick) are deposited by RF sputtering; the number
of layers in the laminate can vary between 60 and 100 layers; they
have good magnetic properties and have good wear properties.

      We have found that when the nitrogen content in the films is
below 7 atom %, the NiFe and Fe layers diffuse in each other; when
the nitrogen content in the films is over 7 atom %, no diffusion
between layers occurs: all layers in a thick laminate are very well
defined.

      We have also found that the magnetic properties of the
laminates vary with the content of nitrogen in the films. For
laminates containing less than 7 atom % nitrogen, the anisotropy is
of the order of 10-12 Oersteds while for laminates containing more
than 7 atom % nitrogen the anisotropy is 4 to 6 Oersteds.  Both types
of laminates are obtained with small easy axis coercivities of about
1 to 1.5 Oersteds.