- News Home
5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
- 5 December 2013 11:26 am , Vol. 342 , #6163
- About Us
Hot Idea for a Faster Hard Drive
7 February 2012 12:29 pm
An ultrashort heat pulse can predictably flip a bit in a magnetic memory like the one in your hard drive. The surprising effect could ultimately lead to magnetic memories hundreds of times faster and more energy efficient than today's hard drives. It also provides a way to control the direction in which a bit is magnetized without applying something else that has a direction, such as a magnetic field.
Two decades ago you could boast that your new desktop computer had a hard drive that could hold 20 megabytes, or 160 million bits, of information. Now, laptops come with disks as big as 1 terabyte—a 50,000-fold increase in capacity. But larger storage capacity must go hand in hand with the ability to read and write bits faster.
Each bit in a magnetic recording medium is in fact a nanometer-sized patch or "domain" that can be magnetized in either of two directions—say, up and down—to encode a 0 or a 1. That information is read out by the read head, a tiny electromagnet that passes over the rotating disk and measures each domain's orientation. The same head also writes the information to the disk by applying a magnetic field that flips a bit's orientation. But the traditional electromagnetic read head struggles to keep up. For a while now, the time needed to write one bit has been stuck at about 1 nanosecond, limiting the rate of data transfer.
That's one reason researchers are searching for much faster ways to flip magnetic bits. One possibility is to heat up the magnetic domain while applying the magnetic field, making the bit easier to flip. But now Alexey Kimel, a physicist at Radboud University Nijmegen in the Netherlands, and colleagues have found that heat alone might do the trick. An ultrashort laser pulse causes a rise in temperature that in a couple of thousandths of a nanosecond controllably switches the orientation of the magnetization of an alloy of gadolinium and iron, the researchers report today in Nature Communications.
The odd thing is that the heat pulse has no direction to tell a tiny magnetic domain which way to point. So at first blush, it might seem like a heat pulse alone should produce a random result, sometimes flipping the bit and sometimes not. Instead, the heat pulses flipped the bit back and forth like a light switch with complete predictability. "This was a total surprise to us all," Kimel says.
The key effect lies in the atomic-scale details of the material—in this case iron and gadolinium—placed on alternating sites in a regular pattern called a crystal lattice. Each atom has its own magnetism. In the material, the iron and gadolinium atoms are magnetized in opposite directions. Because gadolinium is more magnetic, the "ferrimagnetic" material as a whole is magnetized in the direction of the gadolinium atoms. If the material were heated slowly, the interaction between atoms would no longer be able to keep all the spins neatly aligned, and the magnetic order would disappear in a process somewhat like the melting of a solid, Kimel says.
But in the current experiment, laser light heats up the gadolinium-iron alloy so incredibly fast—in 1/10,000 of a nanosecond—that at first only the iron atoms lose their mass orientation. The gadolinium atoms react more slowly in losing their magnetization. And once the iron atoms get hot enough and are free to pivot around, they prefer to align in the same direction as the gadolinium atoms. Then, as the material quickly cools and the orientations of the atoms freeze up, the iron and gadolinium atoms again prefer to point in opposite directions. But this time, it's the slow-cooling gadoliniums that flip leading to a predictable overall reversal in the material's magnetization. "We do not understand the full details of this mechanism yet," says Thomas Ostler of the University of York in the United Kingdom, who performed calculations on the ferrimagnetic material.
The observed effect could make magnetic recording media like hard drives hundreds of times faster. "Writing bits this way is potentially much more energy efficient, because there is no longer a need for energy-consuming electromagnets," Kimel says.
Of course, the new technique must compete against others. In recent years, researchers have shown that they can flip magnetic bits with oscillating electric fields or currents of electrons all spinning the same way—strategies that involve physical entities with directions.
"These techniques will probably be used in commercial products sooner, because scientists and engineers have already been working on them for a couple of years," says physicist Bert Koopmans of Eindhoven University of Technology in the Netherlands, who was not involved in the research. "Personally, I don't see this laser-induced bit switching incorporated in hard drives any time soon, since the necessary laser systems are now still 1-meter long and hard to integrate." Still, Koopmans says, the new technique may find niche applications, such as ultrafast buffer memories, meant to store information in applications that use fast, optical signals, for which speed is more important than miniaturization.