Featured Research

from universities, journals, and other organizations

Coercivity of material changed by patterning surface

Date:
March 18, 2014
Source:
North Carolina State University
Summary:
Researchers have found a way to reduce the coercivity of nickel ferrite (NFO) thin films by as much as 80 percent by patterning the surface of the material, opening the door to more energy efficient high-frequency electronics, such as sensors, microwave devices and antennas.

By creating a corduroy pattern on the surface of NFO thin films, researchers have been able to lower the coercivity of the NFO by 30 to 80 percent, depending on the thickness of the film.
Credit: Goran Rasic

Researchers from North Carolina State University have found a way to reduce the coercivity of nickel ferrite (NFO) thin films by as much as 80 percent by patterning the surface of the material, opening the door to more energy efficient high-frequency electronics, such as sensors, microwave devices and antennas.

Related Articles


"This technique reduces coercivity, which will allow devices to operate more efficiently, reducing energy use and improving device performance," says Goran Rasic, a Ph.D. student at NC State and lead author of a paper describing the work. "We did this work on NFO but, because the reduced coercivity is a direct result of the surface patterning, we think our technique would work for other magnetic materials as well."

Coercivity is a property of magnetized materials and is the amount of magnetic field needed to bring a material's magnetization to zero. Basically, it's how much a material likes being magnetic. For devices that rely on switching current back and forth repeatedly -- such as most consumer electronics -- you want materials that have low coercivity, which improve device performance and use less energy.

Iron oxides, like NFO, have a variety of properties that are desirable for use in high-frequency devices, but they do have a down side: they have high coercivity. The new research from NC State helps address this problem.

By creating a corduroy pattern on the surface of NFO thin films, researchers have been able to lower the coercivity of the NFO by 30 to 80 percent, depending on the thickness of the film. Thinner films experience a larger reduction in coercivity. The surface pattern on the NFO films consists of raised structures that are 55 nanometers (nm) high and 750 nm wide. The structures run parallel to each other and are spaced 750 nm apart, creating the corduroy effect.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Goran Rasic, Justin Schwartz. Coercivity Reduction in Nickel Ferrite (NiFe2O4) Thin Films through Surface Patterning. IEEE Magnetics Letters, 2014; 5: 1 DOI: 10.1109/LMAG.2014.2302246

Cite This Page:

North Carolina State University. "Coercivity of material changed by patterning surface." ScienceDaily. ScienceDaily, 18 March 2014. <www.sciencedaily.com/releases/2014/03/140318112030.htm>.
North Carolina State University. (2014, March 18). Coercivity of material changed by patterning surface. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2014/03/140318112030.htm
North Carolina State University. "Coercivity of material changed by patterning surface." ScienceDaily. www.sciencedaily.com/releases/2014/03/140318112030.htm (accessed October 25, 2014).

Share This



More Matter & Energy News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins