MRAM


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MRAM

[′em‚ram]
(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

MRAM

(Magnetoresistive RAM) Also known as "magnetic RAM," MRAM is a non-volatile memory that provides the byte addressability of RAM and the non-volatile attribute of flash memory. MRAM uses magnetic, thin film elements on a silicon substrate that is built on the same chip with the logic circuits. In contrast, DRAM, SRAM and flash memories cannot be embedded on the CPU chip.

Several organizations make MRAM products, including Everspin, NVE, Honeywell, Toshiba and Samsung. See non-volatile memory.

Similar and Different
Like disks and tapes, MRAM is a magnetic technology. The 0s and 1s are the polarizations of the electrons within a ferromagnetic material. However, their operation is entirely different. MRAM uses a magnetic tunnel junction (MTJ), which comprises two magnetic layers separated by a dielectric (insulation) layer. The bit is read as the resistance in that junction.

Toggle MRAM and STT-MRAM
The two MRAM architectures are field-switched toggle MRAM and spin torque transfer MRAM (STT-MRAM). Toggle RAM has been around for more than a decade, while the newer STT-RAM uses a less complex architecture to achieve higher bit densities. See magnetoresistance, future memory chips and spintronics.


A Bit in Toggle MRAM
Magnetic fields (H fields) are created by the current passing through the two write lines, which are perpendicular to each other. The free layer, where the bit is stored, is switched by the direction of the current. When both the free and fixed layers have the same polarity, the junction offers low resistance, and the bit is 0. In opposite polarity, the bit is 1. (Image courtesy of Everspin Technologies Inc., www.everspin.com)







A Bit in STT-MRAM
Like toggle MRAM above, the 0 or 1 is determined by the resistance between the magnetic orientation in the free and fixed layers. When both layers have the same polarity, the bit is a 0 (low resistance). In opposite polarity, the bit is 1. The yellow arrow is the polarizing current, which flows in one direction at a time. (Image courtesy of Everspin Technologies Inc., www.everspin.com)
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References in periodicals archive ?
According to the company, the new MRAM was designed and fabricated by NEC and has a memory capacity of 1Mb.
SRAM & MRAM is in the process of launching Hey Cab, a B2C cab hiring service on the lines of Uber and Grab in partnership with Master Tours and Travels owned by Rahul Shah in South Africa, Cambodia and India.
Gurujee Shree Kumaran Swamijee, who is a spiritual guru and the biggest advocate of India across the globe with his various social activities said that his organisation has been working with SRAM & MRAM in various CSR initiatives to help the poor and downtrodden in various parts of the globe.
SRAM and MRAM Group Director Manoj Todi informed that with permission of the Government of India, the company had pre-launched SMEXINDIA.
Major semiconductor players such as Samsung, Intel, Toshiba and IBM are intensifying research efforts in MRAM and the team's innovative technology has received strong interest from the industry.( ANI )
SRAM and MRAM Group's core strengths are Agro-products and Information Technology, with footprints spread across multifarious services, verticals and operations viz, Neural Networks, Artificial Intelligence, Hedge Fund Management, FOREX Management, Hospitality Services and Solutions, Information Technology, Media and Publishing, Embedded Systems and Infrastructure.
New memories--notably MRAM, ReRAM and PCRAM--promise unique benefits, but they are based on new materials that have been too challenging for high-volume manufacturing.
MRAM data company Everspin Technologies Inc (Nasdaq:MRAM) disclosed on Friday that it expects total revenue in the range of USD8.3m to USD8.5m for the second quarter ending 28 June 2019.
It is the first manufacturer to be certified for embedding MRAM technology at 22nm (22 MRAM), and to develop finger print detecting technology on optic screens.
We're looking at phase change memory, MRAM. To be able to do analog computing on these models of neural nets.