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MRAM is a memory (RAM) technology that uses electron spin to store information. It has been dubbed “the ideal memory” – potentially combining the density of DRAM with the speed of SRAM and non-volatility of FLASH memory or hard disk, and all this while consuming a very low amount of power.
MRAM can resist high radiation, and can operate in extreme temperature conditions.

MRAM requires less far less memory refresh than DRAM – leading to better organized power consumption. It is also speed-competitive with SRAM (the CPU’s CACHE memory). So MRAM can mean much more storage in mobile devices, with longer battery life. MRAM will eventually be made in high densities, and will perhaps replace your computer’s HD – leading to a fast computer that can instantly turned on.

http://www.mram-info.com/introduction.html