Everspin makes a type called MRAM (magnetoresistive random access memory), which uses magnetic properties to store data.

BBC: ReRAM competes to be tech's next memory chip standard

Since its founding in 2005 the company has created 15 subsidiary companies based on technology like magnetoresistive random access memory from New York University and a salt-intake monitoring system from Cornell University.

FORBES: Magazine Article

TOKYO-Toshiba Corporation (TOKYO: 6502) today announced that the company has developed a prototype memory element for a spin transfer torque magnetoresistive random access memory (STT-MRAM) that achieves the world's lowest1 power consumption yet reported, indicating that it has the potential to surpass the power consumption efficiency of SRAM as cache memory.

ENGADGET: Toshiba goes perpendicular to solve MRAM's power issues, rethink cache memory