Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Materials chemistry: When additives are good

15.03.2012
Researchers have devised a simple and inexpensive approach to making soft magnetic films for microwave applications
Soft magnetic materials can be easily magnetized and demagnetized. They are widely used in microwave devices, such as absorption of electromagnetic radiations.

Developers tend to use thin films of soft magnetic materials, as opposed to their bulk form, in mobile applications, such as cell phones and laptops, as well as military applications, such as stealth aircrafts. However, the conventional approach to making soft magnetic films requires a high vacuum environment, which is expensive and time-consuming. Moreover, the usual fabrication system is not suitable for the preparation of large sheet films, thereby limiting its application in manufacturing the soft magnetic materials for microwave absorption.

Bao-Yu Zong at the A*STAR Data Storage Institute and co-workers1 have now demonstrated the viability of fabricating soft magnetic thin films through electrodeposition, a plating technique that is scalable and can be performed at room temperature. The approach is not only simpler and cheaper to operate, but also versatile enough for making a wide range of soft magnetic materials for microwave applications.

The researchers chose to work with iron–cobalt–nickel alloy, a soft magnetic material with low permeability, high coercivity and other less-than-ideal properties. They added small amounts of organic compounds, including dimethylamine borane and sodium dodecyl sulfate, to the plating solution prior to deposition. The resulting thin films had much higher permeability and lower coercivity, which make them more desirable for microwave applications. The researchers suggest that the additives might have prevented iron from oxidizing during electrodeposition, thereby improving the quality of thin films obtained.

Zong and his team also explored the effect of adding inorganic compounds, such as aluminum potassium sulfate, to the plating solution. They detected an increased resistivity in the thin films — a result that is likely to be a consequence of the change in morphology of the material; that is, the shape of the nanoparticles changed from common granular to columnar (see image), as revealed by atomic force microscopy. The iron–cobalt–nickel thin films also exhibit strong microwave absorption in comparison to ordinary magnetic films. These unique properties are perfect for high-frequency microwave applications, including magnetic data storage, portable wireless and biotechnology devices.

The researchers have high hopes that their approach is applicable to the fabrication of a wide range of soft magnetic materials. "Our technique is cost-effective and scalable. We can create soft magnetic thin films on different size and type of substrates," says Zong. "In a subsequent step, we hope to transfer this methodology to related industrial companies."

The A*STAR-affiliated researchers contributing to this research are from the A*STAR Data Storage Institute

Lee Swee Heng | Research asia research news
Further information:
http://www.research.a-star.edu.sg
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Epoxy compound gets a graphene bump
14.11.2018 | Rice University

nachricht Automated adhesive film placement and stringer integration for aircraft manufacture
15.11.2018 | Fraunhofer IFAM

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Purdue cancer identity technology makes it easier to find a tumor's 'address'

16.11.2018 | Health and Medicine

Good preparation is half the digestion

16.11.2018 | Life Sciences

Microscope measures muscle weakness

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>