25 Apr
2011
25 Apr
'11
9:22 p.m.
On 25 Apr 2011 at 23:57, Dave McGuire wrote:
Aren't some types of media nickel-based? Or is
that just the
substrate over the aluminum or glass platter, between that and the
FeO2?
Nickel-cobalt alloy, usually, sputtered onto a phosphorous-nickel
electroless coating (phosphorous-nickel isn't magnetic; pure nickel
is, slighly). Some sort of protective coating is usually deposited
onto the nickel-cobalt.
There are also high-performance multi-layer coatings.
--Chuck