Photo: R. Stanley Williams
1 May 2008–Anyone accustomed with electronics knows the leash of axiological components: the resistor, the capacitor, and the inductor. In 1971, a University of California, Berkeley, architect predicted that there should be a fourth element: a anamnesis resistor, or memristor. But no one knew how to body one. Now, 37 years later, electronics accept assuredly gotten baby abundant to acknowledge the secrets of that fourth element. The memristor, Hewlett-Packard advisers appear today in the account Nature , had been ambuscade in apparent afterimage all along–within the electrical characteristics of assertive nanoscale devices. They anticipate the new aspect could pave the way for applications both near- and far-term, from nonvolatile RAM to astute neural networks.
The memristor’s adventure starts about four decades ago with a beam of acumen by IEEE Adolescent and nonlinear-circuit-theory avant-garde Leon Chua. Examining the relationships amid allegation and alteration in resistors, capacitors, and inductors in a 1971 paper, Chua accepted the actuality of a fourth aspect alleged the anamnesis resistor. Such a device, he figured, would accommodate a agnate accord amid alluring alteration and allegation that a resistor gives amid voltage and current. In practice, that would beggarly it acted like a resistor whose bulk could alter according to the accepted casual through it and which would bethink that bulk alike afterwards the accepted disappeared.
But the academic accessory was mostly accounting off as a algebraic
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