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Magnets get flipped by light

Laser control of magnetism could improve hard drives

1:25pm, August 22, 2014

A quick laser zap can alter the magnetism of a host of materials, researchers report August 21 in Science. The finding opens up the possibility of using lasers to speed up and simplify data storage in computers.


Computer hard drives read and write data by flipping the magnetization of memory cells with magnetic fields. In 2007, Dutch and Japanese researchers discovered that for a limited set of materials, they could replace the relatively slow, energy-hogging magnetic fields with laser light. The clockwise or counterclockwise polarization of the light determined the direction of the materials’ magnetization.


Physicist Eric Fullerton of the University of California, San Diego and his team decided to shine a rapid-pulse laser at a wider variety of magnetic materials, including those under study for

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