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MILLIPEDEMEMORY

Sooraj.S.Shettigar

111006085MS-ESD(B)

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CONTENTS

The Millipede concept.

Reading and Writing data

Cantilever Structure

Usage Scenarios

Current state of the arts

Future challenges

conclusion

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THE MILLIPEDE CONCEPT

The main memory of modern computers isconstructed from number of DRAM-relateddevices..

Hard drives store data on a metal disk that iscovered with a magnetic material; data isrepresented as local magnetization of thismaterial.

Millipede storage attempts to combine the bestfeatures of both. Like the hard drive, millipedestores data in a "dumb" medium that is simpler

and smaller than any cell used in an electronic

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The name millipede

The name Millipede came from the way thetechnology works.

It consists of a thin, organic polymer on which

sits thousands of fine silicon tips that canpunch information into the polymer surface,leaving pits and creating a way of storing data.

Each tip is very small, with 4,000 fitting onto a6.4 mm square

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WHAT IS MILLIPEDE???

Millipede is a non-volatile computermemory stored

on nanoscopic pits burned into the surface of

a thinpolymer layer.

Millipede storage technology is being pursuedasa potential replacement for magnetic recordingin

hard drives.

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HOW IT IS

Uses nano technology, offers data storagedensity of a trillion bits per square inch

Rather than using traditional magnetic orelectronic means to store data, usesthousands of nano-sharp tips to punch

indentations representing individual bits into athin film.

The 'Millipede' technology is re-writeable(meaning it can be used over and over again)

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NEED OF MILLIPEDE

Millipede technology could pack 10 - 15 gigabytes ofdata into the same tiny format, without requiringmore power for device operation.

"The Millipede project could bring tremendous datacapacity to mobile devices such as personal digitalassistants, cellular phones, and multifunctionalwatches.

Using nanotechnology, scientists have made it tothe millionths of a millimeter range, achieving datastorage densities of more than one terabit (1000GB) per square inch, equivalent to storing thecontent of 25 DVDs on an area the size of a postage

stamp.

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ANIMATED VIEW OF MILLIPEDE

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WHAT IS A CANTILEVER ??

A silicon platform whose one end is fixed and a probe tipis attached to another end which is free to move in thevertical axis by the application of a mechanical force

Arranged in a 2D array on the substrate.

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A CANTILEVER

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Writing & Reading

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WRITING DATA

Bits are written by heating theprobe tip to a temperature of

400 degrees Celsius.

The hot tip softens the

polymer and briefly sinks intoit,& generating an indentation

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READING DATA

Temp needed- 300 degree C.

temperature dependentresistance of the probe tip is the

main principle behind the readoperation

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OVERWRITING DATA

To over-write data, the tip makesa

series of offset pits that overlapsoclosely their edges fill in the oldpits,effectively erasing the unwanteddata.

The write or overwrite cycles are

limited to 1,00,000 cycles

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Zoom to a section of the Millipedecantilever array as seen in an opticalmicroscope

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MICROSCANNER

Movement of the storage medium relative to thecantilever array is achieved using a silicon-based x/ymicro scanner.

The scanner chip is mounted on a silicon base plate,which acts as the mechanical ground of the system .

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A MICROSCANNER

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USAGE SCENARIOS

Micro Drives (watches,mobilesetc)

High-capacity hard drives

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FEATURES

1. Storage capacity 1 terabit per square inch

2. Equal to 25 DVD

3. 25 billion texts in a stamp sized surface

4. Enable large Gb capacity of storage in cellphones

5. Uses atomic force probes

6. Data reads & writes in the storage field 7. Access time is small

8. Data rate is 1Gb/s

9. Needs less power about 100mw

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COMPARISON

DRAM 10 GB/sq inch

FLASH DRIVE 25 GB/sq inch

HARD DRIVE 250 GB/sq inch

MILLIPEDE 1 TB/sq inch

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The millipede chip

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CURRENT STATE OF THE ART

The progress of millipede storage to a commercially

useful product has been slower than expected. Hugeadvances in other competing storage systems,notably Flash and hard drives, has made the existingdemonstrators unattractive for commercialproduction.

Millipede appears to be in a race, attempting tomature quickly enough at a given technology level

that it has not been surpassed by newer generationsof the existing technologies by the time it is ready forproduction.

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CHALLENGES

Overall system reliability, including bit stability,tip and medium wear, erasing/rewriting.

Limits of data rate (S/N ratio), array andcantilever size.

Optimization of write/read multiplexingscheme.

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CONCLUSION

Millipede has an unprecedented storagedensity and the possibilities it opens up arelimitless.

Its speed of access and low powerconsumption make it an ideal choice to fulfillthe burgeoning memory demand.

Millipede is rewritable, and it may eventuallyreplace the present scenario of data storagemechanisms.

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REFERENCES

http://en.wikipedia.org/wiki/Millipede memory,

http://www.zurich.ibm.com/st/storage/index.html,

http://en.wikipedia.org/wiki/Hard disk drive,

http://en.wikipedia.org/wiki/Flash Drive, P. Vettiger, Fellow, G. Cross, M. Despont, U. Drechsler,

U. Drig, B.Gotsmann, W. Hberle, M. A. Lantz,H. E.Rothuizen, R. Stutz, and G. K. Binnig, The

MillipedeNanotechnology Entering Data Storage , www.research.ibm.com/journal/rd/443/vettiger.html,

www.domino.research.ibm.com/comm/pr.nsf/pages/rsc.millipede.html

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