19-06-2014, 03:12 PM
PLASTIC MEMORY
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Introduction
Main challenge in computer construction is the design of new memory chips with decreased size.
Imagine a scenario where the memory stored in your digital camera or personal digital assistant is partially based one of the most flexible materials made by man :plastic.
Scientists at HP lab and Princeton University are excited a new memory technology that could stored more data and cost less than traditional silicon-based chips for mobile devices such as handheld computers ,cell phones and MP3 players.
What is plastic memory
It is a two terminal device that can be written and erased repeatedly by voltage pulses for e.g. -4v & +4v.
It a technique that store a megabit of data in a millimeter square device
STRUCTURE OF PLASTIC MEMORY
The experimental devices to contain two polymer layers.
The first layer consist of PEDOTSS .
The second layer consist of P3HT (3hexylthiophene) with the plasticizer
Polythylene dioxythiopene (pedot)
PEDOT’s ability to conduct electricity. It is already used widely as the anti-static coating on camera film. But until now ,no one suspected that it could be converted into an insulator.
The material is a blend of a negatively charged polymer called PSS and a positively charged one PED.
Spin Electronic structure
It is a thin strip of dark blue organic-based magnet layered with a metallic ferromagnetic connected to two electrical leads.
The data is recorded & retrieved from it by controlling the spin of the electrons with a magnetic field
HOW IT WORK
The device is a polymer that conducts low amount of electricity , but if the high amounts are applied it loss its ability to conduct forever.
So the polymer is like a fuse. Too much voltage and it blows.
We apply a large current to write the data.
PEDOT is ferroelectric polymer
COMPARISON WITH FLASH MEMORY
Plastic memory is fast.
Let a devices with a 1GB storage capacity have yielded read/write cycle times that are 10 times faster than COMPACT FLASH ,typically 2-10 MB/s read ,1-4/s write.
It require far transistors ,typically only 0.5 M (million) for 1GB of storage , compared to silicon’s 1.5-6.5 B(billion).
It has very low power consumption.
ADVANTAGES
One mega bit of information could fit into a millimeter –square device.
Technology could potentially store more data than flash , and perhaps even become fast enough to store videos.
Scientists suggest , producing it wouldn`t requir high temperatures or vacuum chamber.
It`s a very cheap technology which gives it a upper hand over other technology
CONCLUSION
It is 10 times denser then current magnetic memories .
Store mega-bit of data in millimeter-square device.
Data can not be rewritten so suitable for permanent storage.
It requires only few transistors .
Retain data with out power.
Low cost.