Western Digital, UCLA Cook up Refined Spintronics-Based MRAM
December 17, 2012 1:32 PM
comment(s) - last by
Improvements to spin-torque transfer (STT) MRAM bring technology closer to market readiness
MRAM, or MeRAM, is the acronym bandied about for magnetoresistive random access memory, one of
several novel competitors
vying to insert itself
as the replacement
to current digital storage technologies.
I. MRAM -- NAND Killer?
Professor Kang L. Wang
at UCLA -- the
University of California, Los Angeles
-- have come up with a refinement to a special type of MRAM, which they feel is a key improvement that moves the technology closer to broader commercial availability (
some MRAM products
are being currently sold, but at low volume due to the cost).
The UCLA team says the new storage nanocells represent a 10 to 1,000 times power efficiency bump over traditional MRAM designs during the power-intensive write cycle.
Unlike traditional flash memory, which operates using cells that stored values via charge, MRAM cells consist of little nanoscopic "sandwiches", stacks of specially prepared materials. Typically these materials contain a pair of tiny magnetic plates, one permanent, and one adjustable. To write to MRAM, a current induces a shift in polarity, which will remain fixed until the next write.
MRAM is expected to enjoy longevity and speed advantages over NAND or traditional hard-drive-based magnetic storage (which is inherently very slow due to the need for moving parts).
The new MRAM is part of a collection of emerging circuit technologies called "spintronics". Spintronics involves tweaking electron spins to generate novel behavior.
[Image Source: Big Bang Gadget]
MRAM was first developed in the 1990s. A major improvement arrived more recently with the development of spin-transfer torque (STT), a special MRAM technique that uses polarized electrons to trigger a cascade effect and "write" the magnetic value to a nanoscopic in-cell plate.
STT is attractive because unlike with older MRAM designs, it does not require significantly more power to perform a write cycle. However, it still suffered from heat and leakage issues due to the fact that it still required a fair amount of current.
II. Tweaking Spin-Torque
To tackle that challenge, Professor Wang's team modified MRAM cells to use voltage -- a potential difference -- rather than direct current to perform an STT-style write.
Pedram Khalili, a project manager at UCLA-DARPA who participated in the research
, "The ability to switch nanoscale magnets using voltages is an exciting and fast-growing area of research in magnetism. This work presents new insights into questions such as how to control the switching direction using voltage pulses, how to ensure that devices will work without needing external magnetic fields, and how to integrate them into high-density memory arrays."
"Once developed into a product. MeRAM's advantage over competing technologies will not be limited to its lower power dissipation, but equally importantly, it may allow for extremely dense MRAM. This can open up new application areas where low cost and high capacity are the main constraints."
By using voltage instead of current, UCLA researchers have greatly improved write power performance for MRAM spintronic cells. [Image Source: UCLA]
STT MRAM is often referred to under the
umbrella term "spintronics"
, which refers to circuit elements that rely on controlling the spin of electrons to accomplish goals.
Industry observers are clearly pretty interested in the more refined recent iterations of MRAM. Among the participants in the project was Hitachi Global Storage Technologies,
a subsidiary of hard-drive giant Western Digital
). The military is also intrigued; the project received funding from the
U.S. Defense Advanced Research Projects Agency
(DARPA) NV Logic Program.
A paper on the work was published at Dec. 12 at IEEE's 2012 International Electron Devices Meeting (
) in San Francisco, a top electrical engineering conference held annually in Silicon Valley.
This article is over a month old, voting and posting comments is disabled
which magnetic memory tech is this?
12/20/2012 1:01:33 PM
Is this an advancement of HP's "memristor" or is it some other new memory technology?
RE: which magnetic memory tech is this?
12/20/2012 2:02:06 PM
Memristors are a competing technology to this one, which is likely to offer similar benefits.
Memristors are an HP property though, so others will try to find alternatives. It will all boil down to price, density, power and longevity. I think memristors are further along, so we'll probably see them first. This technology looks like it could be denser (more bits per chip) though.
"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." -- Bill Gates
IBM Researchers Observe Theorized Spintronics Feat
August 13, 2012, 2:11 PM
IBM's New Racetrack Memory is on an IC, But Only has "One Car" Per Lane
December 6, 2011, 7:00 PM
Western Digital to Purchase Hitachi GST
March 7, 2011, 10:10 AM
Freescale Semiconductor Announces Commercial Availability of MRAM
July 10, 2006, 9:37 AM
Toshiba, NEC Announce New MRAM Technologies
February 8, 2006, 1:27 AM
SanDisk Unveils Pricey iXpand USB 2.0/Lightning Drive to Expand iPhone, iPad Storage
November 13, 2014, 2:29 PM
HP's 15.6" Omen Gaming Laptop is Incredibly Thin, Powerful
November 4, 2014, 10:34 AM
Tim Cook Touts Apple’s Product Portfolio, Performance in Letter to Employees
October 21, 2014, 8:05 AM
Lenovo Once Again The Top Global PC Maker, Apple Takes 50% of PC Profits
October 9, 2014, 7:46 AM
It’s Official: HP to Split Into Two Business Units
October 6, 2014, 8:14 AM
Quick Note: HP Plans to Split PC, Enterprise Units
October 5, 2014, 4:31 PM
Most Popular Articles
Miyamoto: Nintendo is Prepping Successor to Troubled Wii U
December 22, 2014, 6:28 PM
Amazon's Kindle Fire HDX 8.9 Drops to $299 (30 Percent Off) for a Day
December 22, 2014, 10:57 AM
Android-Powered BLU Studio 7.0 Claims to be the "World's Largest Smartphone"
December 19, 2014, 2:40 PM
Airbus A350 XWB Passenger Jet Takes Off, First Unit Delivered to Qatar Airlines
December 22, 2014, 1:22 PM
Mississippi AG Drops Anti-Google Subpoena After Dirty MPAA Ties Are Revealed
December 22, 2014, 9:51 AM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2014 DailyTech LLC. -
Terms, Conditions & Privacy Information