superparamagnetic limit


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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.
References in periodicals archive ?
In the near term, data-storage density will continue to shrink, despite the impending superparamagnetic limit.
Data densities beyond the superparamagnetic limit have been postulated at the Massachusetts Institute of Technology (Cambridge, MA).
The future of magnetic disk-drive storage hinges on surpassing the superparamagnetic limit.
There is a limit called the superparamagnetic limit.
NFR technology offers an unlimited potential capacity roadmap, unlike traditional magnetic data recording technologies that face the superparamagnetic limit.
Mark Kryder, senior vice president at Seagate Research, longitudinal recording still has time left before reaching the superparamagnetic limit.