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superparamagnetic limit

   Also found in: Wikipedia 0.01 sec.

superparamagnetic limit

The maximum number of bits per square inch that is commercially feasible on a magnetic storage device. As the magnetic bits get smaller, at some point they no longer hold their charge. Thermal fluctuations reduce the signal strength and render the bits unstable.

However, this ultimate areal density keeps changing as researchers find new techniques for recording and sensing the bit. Years ago the limit was thought to be 20 gigabits per square inch. Today, the limit is several hundred gigabits per square inch, and more than a terabit is expected in the years to come. See areal density, magnetoresistance and AFC.



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Today, the hard drive industry's ability to push out the superparamagnetic limit is more critical than ever as capacity requirements continue to grow dramatically.
Perpendicular recording: opening the doors for 10-fold hard drive ... by Best, John / Computer Technology Review
But even perpendicular recording will stave off the superparamagnetic limit only for a few years.
Memory enhancers: researchers explore future possibilities for dense ... by Gorman, Jessica / Science News
In addition, the damping mechanisms that couple the magnetism to the thermal bath also drive the magnetic fluctuations that characterize the superparamagnetic limit of storage density.
Broadband ferromagnetic resonance spectrometer. (News Briefs) by Journal of Research of the National Institute of Standards and Technology
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