jagec is right. Permanent magnets occur when when "atoms" of a magnetic element have dipoles that point in the same direction. Melting the metal down will most definitely rerandomize the miniature dipoles and kill the magnet.
Well, memory access is fairly easy to define. Even the shortest neural pathways take a few milliseconds, and functional neural responses for memory are often recorded within a few seconds (well, in my lab at least). So that at least can take a while longer.
As for the storage capacity...
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