If you're wondering where computer memory and storage will go after flash memory, the phrase to remember is "phase change memory" (PCM). It "reads and writes 100 times faster than flash, stays reliable for millions of write-cycles (as opposed to just thousands with flash), and is cheap enough to be used in anything from enterprise-level servers all the way down to mobile phones." Based on chalcogenide glass (glass containing a chalcogenide elements such as sulfur, selenium or tellurium) phase change memory stores data by switching glass cells between two phases, crystalline and amorphous.
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