Nobel Prize Honors Work in Magnetism
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STOCKHOLM — Two European scientists won the 2007 Nobel Prize in physics today for a discovery that lets computers, iPods, and other digital devices store reams of data on ever-shrinking hard drives.
France’s Albert Fert and German Peter Gruenberg independently discovered a physical effect in 1988 that has led to sensitive tools for reading the information stored on hard disks. That sensitivity lets the electronics industry use smaller and smaller disks.
“The MP3 and iPod industry would not have existed without this discovery,” a member of the Royal Swedish Academy of Sciences, Borje Johansson, said. “You would not have an iPod without this effect.”
The two scientists discovered a phenomenon called giant magnetoresistance. In this effect, very weak changes in magnetism generate larger changes in electrical resistance. This is how information stored magnetically on a hard disk can be converted to electrical signals that the computer reads.
Smaller disks mean fainter magnetic signals, so the ability to detect them is key to shrinking hard disks.
The first disk-reading device based on the effect was launched in 1997 “and this soon became the standard technology,” the Nobel committee said.
A physicist and spokesman for the American Institute of Physics, Phil Schewe, said the prize honored “a terrific combination of great physics and huge practical application.
“I can hardly think of an application that has a bigger bang than the magnetic hard drive industry. Every one of us probably owns three or four or five devices, probably more, that depend on billions of bits of information stored on something the size of a dime.”
Mr. Fert, 69, is the scientific director of the Mixed Unit for Physics at CNRS/Thales in Orsay, France, while Gruenberg, 68, is a professor at the Institute of Solid State Research in western Germany.
In a telephone conference with the award committee, Mr. Fert said he was very happy to win, and to share the $1.5 million prize with Gruenberg.
“This is a surprise for me but I knew that it was possible,” he said. “I knew I was among the many candidates.”
