Perpendicular MRAMs challenge flash

PORTLAND, Ore. -- Magnetic random access memory (MRAM) stores information magnetically, but has so far achieved relatively low densities compared to charge-based memories like flash. Now researchers claim to have solved MRAM's density problems by crafting a ferroelectric interface that allows perpendicular magnetic domains to be as small as 40 nanometers, potentially achieving higher densities than flash.

In conventional MRAMs, two ferromagnetic plates, each of which maintains a magnetic field, are separated by a thin insulating layer. Using magnetic fields to change the state of one plate so that it either matches the other plate or has an opposite orientation, bits can be stored. The new approach developed at Tohoku University (Sendai, Japan) instead uses spin currents to switch memory states, allowing perpendicular magnetic domains that are much smaller than conventional MRAMs.

New York University professor Andrew Kent, an expert in mesoscopic magnetic systems, said it was significant that the Japanese researchers used conventional ferromagnetic material.

By crafting magnetic tunnel junctions for perpendicular recording, the researchers group used interfacial anisotropy between the ferromagnetic plates and the tunnel barrier. Using a material with a CoFeB-to-MgO interface allowed the researchers to produce a giant tunnel magnetoresistance ratio that can switch bits on and off with currents as small as 49 microamps.

About Magnetic Solutions 

Magnetic Solutions, a privately held company based in Dublin, Ireland with offices in the USA, Korea, Japan and Taiwan, is a leading developer of process technology used in the manufacture of magneto-electronic devices such as MRAM, a non-volatile memory chip, GMR sensors used in data storage.
Since its introduction in 2000, the MRT1000/2000 system has become the industry leading magnetic annealing technology for MRAM providing exceptional reliability, low cost of ownership, fast cycle times and is used by leading semiconductor companies in the USA, Europe, Korea and Japan.