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Re: Core memory
- To: T.L.G.vanderLinden@student.utwente.nl (Timothy van der Linden)
- Subject: Re: Core memory
- From: Steve VanDevender <stevev@efn.org>
- Date: Tue, 12 Mar 1996 11:18:34 -0800
- Cc: KellySt@aol.com, kgstar@most.magec.com, stevev@efn.org, jim@bogie2.bio.purdue.edu, zkulpa@zmit1.ippt.gov.pl, hous0042@maroon.tc.umn.edu, rddesign@wolfenet.com, David@InterWorld.com, lparker@destin.gulfnet.com, bmansur@oc.edu
- In-Reply-To: <199603121412.AA18640@student.utwente.nl>
- References: <199603121412.AA18640@student.utwente.nl>
Timothy van der Linden writes:
> > > Why doesn't the magnetic field in the ferrite core degrade? (I assume the
> > > ferrite has some resistance.)
> >
> >Have you ever known other magnets to degrade? Once magnetized, a
> >material won't demagnetize unless exposed to heat above its Curie point
> >or another sufficiently strong magnetic field.
>
> Oh, now I understand, you create a permanent magnetic field just like
> magnetic discs and tapes. (I though you created a current in the core) So in
> fact the cores don't need to be closed completely.
>
> Tim
The core is in essence just a lump of magnetizable material; they were
generally made toroidal because it was easiest to string them that way.
There were some designs for magnetic memory that didn't use cores, but
(if I recall correctly) used spots of magnetic material sandwiched
between two layers of parallel conductors. And even more exotic memory
hardware has existed -- ever heard of mecury delay lines? Williams
tubes?
- References:
- Re: Core memory
- From: T.L.G.vanderLinden@student.utwente.nl (Timothy van der Linden)