So let’s quickly break down what is inside those heads.
From the giant 4 track of the pre 60s to the miniature nanometer level heads for 1” spinning hard disks.

Outer shell: steel. Newer ones use an iron nickel chromium steel. Older ones use iron nickel and aluminium steel.
Iron ferrite band.
The actual head arm.
(post 76)Signal controller IC.

Inside:
Copper coil.
Steel coil
Compressed Head package

Compressed head package:
Contact- often ferrite

Soft Metallic ceramic —:
Ranges.
NFe
NGa
NMg
Etc.

Conductive film
Rhodium spacer
Metallic spacer- varies by age and manufacturer
î
Each with a rubber or plastic foam spacer between them, depending on age.


Bias braces
2x
CoPtCr is most common today.


Head
——
—
——
—
——
—
——


Package
@-
V
\—/
——


Layout
[ ] <@- #-~ arm/wires

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42 6F 61 72 64 73 6F 72 74 2E 63 6F 6D