Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Nano materials for medical measuring devices

Cross-section of a new magnetoelectric composite sensor as scanned in an electron microscope: piezoelectric material (bottom half) and magnetostrictive material with integrated support layers (upper half).
Photo: Christiane Zamponi
Copyright: Kiel University/ Institute of Materials Science
Cross-section of a new magnetoelectric composite sensor as scanned in an electron microscope: piezoelectric material (bottom half) and magnetostrictive material with integrated support layers (upper half).

Photo: Christiane Zamponi Copyright: Kiel University/ Institute of Materials Science

Abstract:
New magnetoelectric sensors for deep brain stimulation

Up to now, the brain's magnetic field is measurable only under technical laboratory conditions. This technique is therefore not feasible in terms of the broader medical use, although it would be significant for diagnosing numerous conditions such as epilepsy and dementia, or even for improving therapies such as deep brain stimulation for treating Parkinson's disease. Three research teams at Kiel University (Germany) have now jointly developed a new type of magnetoelectric sensor, which is intended to allow the use of this important technology in the future. The scientific breakthrough: As opposed to conventional magnetoelectric measuring techniques, the new sensors operate at normal conditions. Neither cooling nor external magnetic bias fields are required. A new article in Nature Materials describes the design and properties of these so-called exchange biased magnetoelectric composite materials.

Nano materials for medical measuring devices

Kiel, Germany | Posted on April 27th, 2012

"Our composites with exchange biasing present an international milestone in the research of magnetoelectric materials", says Professor Eckhard Quandt, senior author of the study and spokesperson of the Collaborative Research Centre 855 Magnetoelectric Composites - Future Biomagnetic Interfaces (CRC 855). "By eliminating the dependence on externally applied magnetic bias fields, we have removed a significant obstacle for the medical application of magnetoelectric sensors such as magnetocardiography and magnetoencephalography". As the sensors do not affect one another due to their particular design, measuring arrays made up of hundreds of units are now conceivable. This would enable the production of flow maps of heart currents or brain waves.

The new composites consist of a complex sequence of around a hundred layers of material, each of which is only a few nanometres thick. The magnetoelectric sensors contain both magnetostrictive and piezoelectric layers which, on the one hand, deform due to a magnetic field to be measured and, as a result of this, at the same time produce electrical voltage which is used as the measuring signal. Enno Lage who has been working on the study since 2010 explains its background: "With the conventional magnetoelectric layer systems it is only possible to perform such highly sensitive measurements if the sensor is subjected to a bias magnetic field.

"What makes our composites so extraordinary are antiferromagnetic supporting layers made of manganese iridium, which act like magnetic fields inside the material", he adds. "This means that the bias field for the measurement is produced directly in the sensor and no longer needs to be provided externally." A complete sensor is usually a few millimetres in size and contains a multi-layer of this new material, which is approximately a thousandth of a millimetre thick. The new composite materials have been produced in the recently established Kiel Nano Laboratory's cleanroom. "These types of sensor systems can only be produced successfully in this particle-free environment", says Dr. Dirk Meyners, who is scientifically supervising Lage during the doctoral degree programme.

With this step in the development towards removing the dependence of magnetoelectric measurements on external magnetic bias fields, the working groups led by Lorenz Kienle, Reinhard Knöchel and Eckhard Quandt have achieved an important objective of the CRC 855, which has been supported by the German Research Foundation since January 2010. The CRC's overall aim is to develop such new materials and to implement them into a fully functional, biomagnetic interface between men and the outside world. Quandt indicates future prospects: "Beyond the CRC's opportunities, in the Cluster of Excellence Materials for Life, which is currently being reviewed, we could promote a range of further applications on the basis of these composites, for example, as sensors for non-invasive brain stimulation."

Full bibliographic information

Lage, E., Kirchhof, C., Hrkac, V., Kienle, L., Jahns, R., Knöchel, R., Quandt, E. and Meyners, D. (2012): Exchange biasing of magnetoelectric composites, Nature Materials doi:10.1038/nmat3306, www.nature.com/nmat/journal/vaop/ncurrent/full/nmat3306.html

####

For more information, please click here

Contacts:
Boris Pawlowski

Copyright © AlphaGalileo

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

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

Conductive Inks: booming to $2.8 billion by 2024 April 17th, 2014

Nanomedicine

Innovative strategy to facilitate organ repair April 18th, 2014

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

High-temperature plasmonics eyed for solar, computer innovation April 17th, 2014

Sensors

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

Biologists Develop Nanosensors to Visualize Movements and Distribution of Plant Stress Hormone April 15th, 2014

LetiDays Grenoble to Present Multiple Perspectives on Development, Challenges and Markets for the IoT April 14th, 2014

In latest generation of tiny biosensors, size isn't everything: UCLA researchers overturn conventional wisdom on nanowire-based diagnostic devices April 11th, 2014

Discoveries

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Thinnest feasible membrane produced April 17th, 2014

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

Announcements

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Oxford Instruments Asylum Research Introduces the MFP-3D InfinityTM AFM Featuring Powerful New Capabilities and Stunning High Performance April 18th, 2014

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE