Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > CNST Researchers Use Spin Waves to Measure Magnetic Polarization of Electrical Current

Abstract:
In the hard drive industry, the rapid growth of storage density has been propelled in part by developments in the sensors used to read the magnetic "bits" on the disk. Recently, the use of giant magnetoresistance (GMR) in such sensors, with current flowing in the plane of a multilayer film, has given way to the use of tunneling magnetoresistance, where current flows perpendicular to the plane of the multilayer through a tunnel barrier. To avoid the prohibitively high resistance of smaller tunnel junction sensors, future miniaturization of the sensors is projected to again require the use of GMR in all-metal multilayers, but with current flowing perpendicular to the plane. In a collaboration with researchers at Hitachi Global Storage Technologies, CNST researchers used their recently developed spin wave Doppler technique to measure the current polarization in novel (CoFe)1-xGex alloys being investigated for possible use in future disk drive read head sensors.* A critical parameter in determining the GMR of a multilayer sensor film is the current polarization, which is the degree to which the current carried in a magnetic metal is carried by electrons with spins either parallel or anti-parallel to the magnetization. The CNST researchers' measurement technique used nanostructured antennas to launch and detect spin waves in current-carrying (CoFe)1-xGex stripes, allowing them to measure shifts of a resonant transmission frequency that revealed the current-induced drift velocity of the magnetization and the current polarization. The results indicate polarization up to 95 % in these alloys. Although comparable polarization values have been found in materials that require annealing at prohibitively high temperatures, the (CoFe)1-xGex alloys are compatible with sensor manufacturing.

CNST Researchers Use Spin Waves to Measure Magnetic Polarization of Electrical Current

Boulder, CO | Posted on March 9th, 2011

Enhanced magnetization drift velocity and current polarization in (CoFe)1−xGex alloys, M. Zhu, B. D. Soe, R. D. McMichael, M. J. Carey, S. Maat, and J. R. Childress, Applied Physics Letters 98, 072510-072510-3 (2011).

####

For more information, please click here

Contacts:
Robert McMichael
301-975-5121

Copyright © NIST

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Affordable STM32 Cloud-Connectable Kit from STMicroelectronics Puts More Features On-Board for Fast and Flexible IoT-Device Development April 26th, 2017

Geoffrey Beach: Drawn to explore magnetism: Materials researcher is working on the magnetic memory of the future April 25th, 2017

Using light to propel water : With new method, MIT engineers can control and separate fluids on a surface using only visible light April 25th, 2017

Nanoparticle vaccine shows potential as immunotherapy to fight multiple cancer types April 24th, 2017

Spintronics

Smart multi-layered magnetic material acts as an electric switch: New study reveals characteristic of islands of magnetic metals between vacuum gaps, displaying tunnelling electric current March 1st, 2017

First experimental proof of a 70 year old physics theory: First observation of magnetic phase transition in 2-D materials, as predicted by the Nobel winner Onsager in 1943 January 6th, 2017

Investigations of the skyrmion Hall effect reveal surprising results: One step further towards the application of skyrmions in spintronic devices December 28th, 2016

Electron highway inside crystal December 12th, 2016

Memory Technology

Geoffrey Beach: Drawn to explore magnetism: Materials researcher is working on the magnetic memory of the future April 25th, 2017

New ultrafast flexible and transparent memory devices could herald new era of electronics April 1st, 2017

Information storage with a nanoscale twist: Discovery of a novel rotational force inside magnetic vortices makes it easier to design ultrahigh capacity disk drives March 28th, 2017

Smart multi-layered magnetic material acts as an electric switch: New study reveals characteristic of islands of magnetic metals between vacuum gaps, displaying tunnelling electric current March 1st, 2017

Sensors

Better living through pressure: Functional nanomaterials made easy April 19th, 2017

A Sensitive And Dynamic Tactile Sensor Read more from Asian Scientist Magazine at: https://www.asianscientist.com/2017/04/tech/tactile-3d-active-matrix-sensor/ April 18th, 2017

AIM Photonics Presents Cutting-Edge Integrated Photonics Technology Developments to Packed House at OFC 2017, the Optical Networking and Communication Conference & Exhibition April 11th, 2017

New technology could offer cheaper, faster food testing: Specialized droplets interact with bacteria and can be analyzed using a smartphone April 7th, 2017

Discoveries

Geoffrey Beach: Drawn to explore magnetism: Materials researcher is working on the magnetic memory of the future April 25th, 2017

Using light to propel water : With new method, MIT engineers can control and separate fluids on a surface using only visible light April 25th, 2017

Graphene holds up under high pressure: Used in filtration membranes, ultrathin material could help make desalination more productive April 24th, 2017

Nanoparticle vaccine shows potential as immunotherapy to fight multiple cancer types April 24th, 2017

Announcements

Affordable STM32 Cloud-Connectable Kit from STMicroelectronics Puts More Features On-Board for Fast and Flexible IoT-Device Development April 26th, 2017

Geoffrey Beach: Drawn to explore magnetism: Materials researcher is working on the magnetic memory of the future April 25th, 2017

Using light to propel water : With new method, MIT engineers can control and separate fluids on a surface using only visible light April 25th, 2017

Graphene holds up under high pressure: Used in filtration membranes, ultrathin material could help make desalination more productive April 24th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project