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Graphene Goes the Distance in Spintronics

Experiments push electron-spin signals to record lengths

4 min read
A multilayer flake of graphene [dark wedge] carries a spin signal between two electrodes made from a magnetic alloy.
Image: Yunfei Gao and Yuri Kubo

Fast Flake: Amultilayer flake of graphene (dark wedge) carries a spin signal betweentwo electrodes made from a magnetic alloy.

Image: Yunfei Gao and Yuri Kubo
Fast Flake: A multilayer flake of graphene [dark wedge] carries a spin signal between two electrodes made from a magnetic alloy.

The future of computing might just come down to the honeycomb.

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A Circuit to Boost Battery Life

Digital low-dropout voltage regulators will save time, money, and power

11 min read
Image of a battery held sideways by pliers on each side.
Edmon de Haro

YOU'VE PROBABLY PLAYED hundreds, maybe thousands, of videos on your smartphone. But have you ever thought about what happens when you press “play”?

The instant you touch that little triangle, many things happen at once. In microseconds, idle compute cores on your phone's processor spring to life. As they do so, their voltages and clock frequencies shoot up to ensure that the video decompresses and displays without delay. Meanwhile, other cores, running tasks in the background, throttle down. Charge surges into the active cores' millions of transistors and slows to a trickle in the newly idled ones.

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