I think you are confusing spintronics with quantum computing. Spintronics include many different applications (just like electronics). From what I know, the status of each application is:
1. GMR - it works and works beautifully. It has brought about a revolution in disk storage technology.
2. MRAM - it works. Prototypes have been made and demonstrated. It's the matter of refining the technology so that it can be commerically competitive with semicondutors.
3. Spin transistors - it may work. Many designs have been proposed. It's the matter of find the right design and figuring out how to make it work.
4. Spin tunneling devices - the principle is understood but how to use it in real applications still needs to be worked on.
5. Quantum computing - it will probably never work. Yeah, you can compute with no problem. The problem is, how can you get the results out without destroying the quantum states? We may need to rewrite quantum mechanics before this one works.
So by and large, spintronics works.
Re:An international tragedy
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Chinese foreign minister announced three Chinese citizens killed, one missing.
Has anyone thought of the possible connection to the mysterious crash of Egyptian Air 990 in Nov of 1999? That plane was also a 767. No evidence of mechanical failure was found. The US investigators believed that the copilot may have drove the plane into the Atlantic in an act of suicide, but the Egyptians disagreed. Could there be any connection?
Guys/gals, you are confusing this device with the magneto-electronics devices described in the IEEE Spectrum article. They are very different. This is essentially a nano version of the magnetic bubble memory. The switching speed is in the order of msec. Yes, milli-seconds. That is why they are driving it at 30Hz.
The devices described in the Spectrum use a new phenomenon called giant-magnetoresistance. Those devices can be switched orders of magnitude faster than silicon devices.
If you read the article in Science, it appears that the speed at which they are driving these memories is about 30Hz. That's right, thirty Hertz, no M or G or any other prefix.
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I think you are confusing spintronics with quantum computing. Spintronics include many different applications (just like electronics). From what I know, the status of each application is:
1. GMR - it works and works beautifully. It has brought about a revolution in disk storage technology.
2. MRAM - it works. Prototypes have been made and demonstrated. It's the matter of refining the technology so that it can be commerically competitive with semicondutors.
3. Spin transistors - it may work. Many designs have been proposed. It's the matter of find the right design and figuring out how to make it work.
4. Spin tunneling devices - the principle is understood but how to use it in real applications still needs to be worked on.
5. Quantum computing - it will probably never work. Yeah, you can compute with no problem. The problem is, how can you get the results out without destroying the quantum states? We may need to rewrite quantum mechanics before this one works.
So by and large, spintronics works.
Chinese foreign minister announced three Chinese citizens killed, one missing.
Has anyone thought of the possible connection to the mysterious crash of Egyptian Air 990 in Nov of 1999? That plane was also a 767. No evidence of mechanical failure was found. The US investigators believed that the copilot may have drove the plane into the Atlantic in an act of suicide, but the Egyptians disagreed. Could there be any connection?
Which galaxy will the match be? (I assume it will be in another galaxy so you have to use a telescope to watch it :-)
Guys/gals, you are confusing this device with the magneto-electronics devices described in the IEEE Spectrum article. They are very different. This is essentially a nano version of the magnetic bubble memory. The switching speed is in the order of msec. Yes, milli-seconds. That is why they are driving it at 30Hz.
The devices described in the Spectrum use a new phenomenon called giant-magnetoresistance. Those devices can be switched orders of magnitude faster than silicon devices.
They are totally different beasts.
If you read the article in Science, it appears that the speed at which they are driving these memories is about 30Hz. That's right, thirty Hertz, no M or G or any other prefix.