Navigation Links
Nanoscale magnetic media diagnostics by rippling spin waves

Memory devices based on magnetism are one of the core technologies of the computing industry, and engineers are working to develop new forms of magnetic memory that are faster, smaller, and more energy efficient than today's flash and SDRAM memory. They now have a new tool developed by a team from the National Institute of Standards and Technology (NIST), the University of Maryland Nanocenter and the Royal Institute of Technology in Swedena method to detect defects in magnetic structures as small as a tenth of a micrometer even if the region in question is buried inside a multilayer electronic device.*

The technique demonstrated at the NIST Center for Nanoscale Technology (CNST) builds on work by researchers at the Ohio State University.** The idea is to trap and image oscillating perturbations of a magnetic field"spin waves"in a thin film. Trapped spin waves provide scientists with a powerful new tool to nondestructively measure the properties of magnetic materials and search for nanoscale defects that could or have caused memory failures, especially in multilayer magnetic systems like a typical hard drive, where defects could be buried beneath the surface.

According to NIST researcher Robert McMichael, when left alone, the material's magnetization is like the surface of a pond on a windless day. The pond is comprised of smaller magnetic moments that come with the quantum mechanical "spin" of electrons. Tap the surface of the pond with a piece of driftwood, or microwaves in this case, and the surface will begin to ripple with spin waves as the microwave energy jostles the spins, which, in turn, jostle their neighbors.

"The trick we play is to tune the microwaves to a frequency just outside the band where the spin waves can propagateexcept right under our magnetic probe tip," says McMichael. "It's like the pond is frozen except for a little melted spot that we can move around to check magnetic properties at different spots in the sample."

The trapped spin waves are disturbed by defects in the material, and this effect allows the defects to be characterized on 100 nm length scales.

Previous work had shown this same effect in magnetic spins that were oriented perpendicular to the magnetic film surface, meaning that the individual spins coupled strongly with their neighbors, which limited the resolution. This new work adds the extra feature that the magnetic spins are aligned in plane with one another and are not as tightly coupled. This setup is not only more representative of how many magnetic devices would be structured, but also allows for tighter focusing and better resolution.


Contact: Mark Esser
National Institute of Standards and Technology (NIST)

Related biology technology :

1. Solved: The mystery of the nanoscale crop circles
2. Magnetic actuation enables nanoscale thermal analysis
3. ORNL experiments prove nanoscale metallic conductivity in ferroelectrics
4. Carving at the nanoscale
5. Penn and Brown researchers demonstrate earthquake friction effect at the nanoscale
6. Wideband Antenna for Novelda Nanoscale Impulse Radar
7. Stanford engineers create nanoscale nonlinear light source
8. $13-million NSF center to explore new ways to manipulate light at the nanoscale
9. Nanoscale spin waves can replace microwaves
10. ONR funds study of nanoscale wetting dynamics of superhydrophobic surfaces at Stevens
11. Tiny wires change behavior at nanoscale
Post Your Comments:
Related Image:
Nanoscale magnetic media diagnostics by rippling spin waves
(Date:10/13/2015)... , ... October 13, 2015 , ... ... educational opportunities for school age children in the areas of Science, Technology, Engineering ... sectors of the national economy, and the program aims to increase the number ...
(Date:10/12/2015)... , Oct. 12, 2015 This report ... which include cell type, products, applications, end-user markets and ... REPORT HIGHLIGHTS The global cell expansion market generated ... expected to reach revenues of $9.7 billion in 2015 ... growth rate (CAGR) of 17.8% from 2015 to 2020. ...
(Date:10/12/2015)... , Oct. 12, 2015  Patara Pharma, a ... and inflammatory diseases and conditions, today announced the ... stock financing. Concurrent with the close of its ... a Loan and Security Agreement with Silicon Valley ... $7 million. Patara will use the funds from ...
(Date:10/12/2015)... WA (PRWEB) , ... October 12, 2015 , ... NeuMedics ... the treatment of retinal diseases that can safely and chronically be administered as an ... Health Impact Forum co-hosted by The Cleveland Clinic and taking place October 25th to ...
Breaking Biology Technology:
(Date:10/8/2015)... , October 8, 2015 ... or the "Company"), a biometric authentication company focused ... of the Wocket® smart wallet announces that revenues ... were approximately $410,000 compared with $113,00 for the ... the 9 months ended September 30, 2015 were ...
(Date:10/7/2015)... -- NXTD ) ("NXT-ID" or the "Company"), ... commerce market and creator of the Wocket® smart wallet ... term executive at American Express has been appointed to ... ("NXT-ID" or the "Company"), a biometric authentication company focused ... the Wocket® smart wallet announces Mr. Stanley E. ...
(Date:10/6/2015)... Oct. 6, 2015  Maverix Biomics, Inc., a ... to its software portfolio with the debut of ... differential expression in eukaryotes. The software is integrated ... cloud-based genomic analysis solution that leverages proven open-source ... next-generation sequencing efforts. Garry Nolan,s ...
Breaking Biology News(10 mins):