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MEMRISTOR

SREEJITH A G

S7 EB # 57

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What isMemristorMem story

InsideMemristors

WhyMemristor

Big Guns involved

FUTURETo conclude

Ref:

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What is memristor ?

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Memristor is really aMEMory ResISTOR

Memristor can be defined as a two

terminal device which shows the

relation between magnetic flux

and charge

memristor symbol

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Memristor Analogy

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The term Memristor was first proposed byLeon Chaua in 1971 when he was a risingprofessor atThe University of CaliforniaBerkeley

LEON.O.CHUA

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THE FORTH FUNDAMENTAL DEVICE

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Pinched Loop Curve

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MEMISTOR

IN 1960 Bernard Widrow develops a 3

terminal device called a "memistor" as a new

fundamental circuit component forming thebasis of a neural network circuit called

ADALINE (ADAptive LInear NEuron).

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1960:

Bernard Widrow develops a 3-terminal device called a

"memistor" as a new fundamental circuit component forming the

basis of a neural network circuit called ADALINE (ADAptive LInearNEuron).

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1971:Lion chaua postulates a new two terminal circuit element characterised

by flux charge relationship in the article

"Memristor-the Missing Circuit Element" published in

IEEE Transactions on Circuit Theory

1972:Leon Chua and his student Sung Mo Kang publish a paper entitled

"Memristive Devices and Systems" in the Proceedings of the IEEEgeneralizing the theory of memristors and memristive systems

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1998:Bhagwat Swaroop, William West and others publish a paper entitled

Programmable Current Mode Hebbian Learning Neural Network

Using Programmable Metallization Cell"

in the Proceedings of the IEEE International Symposium onCircuits and Systems demonstrating that the complexity of an artificial

synapse can be minimized by using an ionic programmable resistance

device.

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2008:MAY

Dmitri Strukov, Gregory Snider, Duncan Stewart, and Stan Williams, of

HP Labs, publish an article in Nature

"The missing memristor found"

identifying a link between the 2-terminal resistance switching

behavior found in nano scale systems and Leon Chua's memristor.

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JULY

Victor Erokhin and M.P. Fontana claim to have developed a polymeric

memristor before the titanium dioxide memristor of Stan Williams

group in the article "Electrochemically controlled polymeric device:

a memristor (and more) found two years ago."

SEPTEMBERBlaise Mouttet, a graduate student at George Mason University,

presents a poster entitled "Proposal for Memristors in Signal

Processing" at Nano-Net 2008, a nanotechnology conference in

Boston

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2009:MARCH

XiaobinWang, Yiran Chen, Haiwen Xi, Hai Li, and Dimitar

Dimitrov publishes article entitled Spintronic Memristor

Through Spin-Torque-Induced Magnetization Motion in

IEEE Electron Device Letters

JULY

NIST scientist demonstrate flexible memory which has memristorproperties

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SEPTEMBER

Memristive behavior of magnetic tunnel junctions is reported by

researchers from the Bielefeld University, Germany.

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Memistor

In 1960 circuit element called the memistor (a resistor with memory)has been devised by B. Widrow and M. E, Hoff for the realization of

automatically adapted ADALINE neurons

The first working memistors were made of ordinary pencil leads

immersed in test tubescontaining copper sulphate-

sulphuric acid plating baths.

These elements are small and

rugged, cheap, simple, andnoncritical in manufacture.

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In may of 2008, 37 year oldWaiting for Leon Chua blossomed,when scientists under theleadership of

R .Stanley Williamscreated the firstmemristorat

HP labsThe Memristor was created out

ofTiO2 andTiO 2-x

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How H Ps Memristor works

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DRAWBACKS

The models do not take into account memcapacitiveeffects.

The models are poorly formulated.

The models do not properly distinguish the internal andexternal electric field.

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Spintronic Memristor

Yiran Chen and Xiaobin Wang, researchers at disk-driveManufacturer Seagate Technologydescribed three

examples of possible magnetic memristors inIEEE

Electron Device Letters

Spintronics is at the heart of recent

advances in hard-drive data density

and the niche nonvolatile memory

known as MRAM

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The three methods

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NISTs effort to built the first

nonvolatile fast flexiblememory for defense purposeled them to the invention offirst ever flexible memristorin July of 2009

This memristor uses thesame material as that of HPsmemristor but in a much

simpler way

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Other types of Memristor to be developed

Magneto Resistive memory effect

Electrostatic effect

Valency change effect

Thermo chemical effect

Phase change memory

Nano mechanical memory

Ferroelectric/ MF Tunneling

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Nonvolatile memories

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Logic/computing

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Artificial Brain

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Physarum polycephalum

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Big Guns involved

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Future

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Memcapacitor

and

Meminductor

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To conclude

It is sure that Memristor is going to revolutionaries the 21stcentury as radically as the transistor in the 20th century

But Memristor will have to wait a few years for a

killer app like transistor which had to wait almost a decade

after its invention for the killer app in the form of hearing aids

Finally as Leon O Chua mentioned

Its time to rewrite all the EE textbooks

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REFERENCE "MemristorThe Missing Circuit Element",IEEE

Transactions on Circuit Theory by Leon O Chua

(1971)

"Memristive Devices and Systems" in the

Proceedings of the IEEEby Leon Chua and his

student Sung Mo Kang (1976)

"The missing memristor found"Nature (may2008)

IEEE Spectrum - The Mysterious Memristor, by

Sally Adee (may 2008)

IEEE Spectrum - How We Found the MissingMemristor, by R. Stanley Williams (dec 2008)

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Spintronic Memristor Through Spin-Torque-

Induced Magnetization Motion by XiaobinWang,

Yiran Chen, Haiwen Xi, Hai Li,and Dimitar

DimitrovIEEE Electron Device Letters,(march2009)

A Flexible Solution-Processed Memristor by

Nadine Gergel-Hackett, Behrang Hamadani,

Barbara Dunlap, John Suehle, Curt Richter,Christina Hacker, and David Gundlach,IEEE

Electron Device Letters, (july 2009)

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web links

en.wikipedia.org/wiki/Memristor

www.hpl.hp.com/news/2008/apr-jun/memristor.html

www.memristor.org

www.newscientist.com/article/mg20327151.600-memristor-

minds-the-future-of-artificial-intelligence.html

www.youtube.com/ucberkley

http://blogs.howstuffworks.com/2009/07/24/

how-does-a-memristor-work/

www.spectrum.ieee.org

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VIDEO LINKS

Memristor and Memristive Systems Symposium (4 parts)total of 5 hours

6-Minute Memristor Guide

Memristors The Missing Link(3:38)

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Any queries?...

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