But as wires and switches are shrunk and packed ever closer together, with thinner and thinner silicon insulation, the chance of current leakage rises.

FORBES: Magazine Article

However, improving the performance of SRAM to match advances in mobile products results in increasing current leakage, both during operation and in standby mode, degrading power performance.

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