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New NIST microscope measures nanomagnet property vital to 'spintronics'
Date:3/15/2013

Researchers at the National Institute of Standards and Technology (NIST) have developed a new microscope able to view and measure an important but elusive property of the nanoscale magnets used in an advanced, experimental form of digital memory. The new instrument already has demonstrated its utility with initial results that suggest how to limit power consumption in future computer memories.

NIST's heterodyne magneto-optic microwave microscope, or H-MOMM, can measure collective dynamics of the electrons' spinsthe basic phenomenon behind magnetismin individual magnets as small as 100 nanometers in diameter. Nanomagnets are central components of low-power, high-speed "spintronic" computer memory, which might soon replace conventional random-access memory. Spintronics relies on electrons behaving like bar magnets, pointing in different directions to manipulate and store data, whereas conventional electronics rely on charge.

"The measurement technique is entirely novel, the capability that it has enabled is unprecedented, and the scientific results are groundbreaking," project leader Tom Silva says.

As described in a new paper,* NIST researchers used the H-MOMM to quantify, for the first time, the spin relaxation processor dampingin individual nanomagnets. Spin relaxation is related to how much energy is required to switch a unit of spintronic memory between a 0 and a 1 (the bits used to represent data).

The nanomagnets used in experimental spintronic systems are too big to yield their secrets to conventional atomic physics tools yet too small for techniques used with bulk materials. Until now, researchers have been forced to measure the average damping from groups of nanomagnets. The new microscope enabled NIST researchers to study, in detail, the ups and downs of spin excitation in individual magnets made of a layer of a nickel-iron alloy on a sapphire base.

The H-MOMM combines optical and microwave techniques. Two g
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Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert

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