3D corduroy patterns: key to low magnetic coercivity for better switching efficiency
March 18, 2014 // Paul Buckley
Researchers from North Carolina State University have paved the way to more energy efficient high-frequency electronics, such as sensors, microwave devices and antennas, by reducing the coercivity of nickel ferrite (NFO) thin films by as much as 80 percent.
By creating a corduroy pattern on the surface of NFO thin films, the 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.
“This technique reduces coercivity, which will allow devices to operate more efficiently, reducing energy use and improving device performance,” explained 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 is 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 high coercivity which is a drawback.
The paper entitled 'Coercivity Reduction in Nickel Ferrite (NiFe2O4) Thin Films through Surface Patterning', is published online in IEEE Magnetics Letters.
Related articles and links:
Thin film solar cell costs cut through 'superabsorbing' design
Non-flammable electrode replacement discovered for lithium ion batteries
Gallium nitride boosted into high-power realm
Biodegradable electronics debut
July 03, 2015
Today our landfills are being overrun by discarded electronic devices fabricated on silicon substrates that do not biodegrade ...
Power magnetics Lab Kit enters education
Automotive software design: new challenges through multiprocessing
Ultrasound sensor protects pedestrians
Dielectric material helps keep LED packages much cooler
PowerChip plans Chinese fab for display, sensor ICs
July 02, 2015
A former DRAM vendor, now foundry, is joining a trend towards supporting manufacturing in China, according to local reports. ...
XeThru Bot simulates breathing for sensor testing: built from Lego
Sony to raise $3.6bn to speed reinvention as component company
Startup's tech is Intel's Quark neural network
- Critical Requirements in High Speed Signal Generation Applications
- The 400XAC Series: Two Major Advantages that Simplify Functional Testing
- A Smart Way to Drive ECU Consolidation
- Autonomous Driving: An Eye on the Road Ahead
InterviewCEO interview: Cadence is about enablement, collaboration
EDA companies are being asked to provide expertise from the circuit- to the system-level observes Lip-Bu Tan, CEO of EDA software vendor Cadence Design Systems Inc. Covering such a breadth of endeavour ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.