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
Report: Abu Dhabi holding talks over GloFo sale
November 25, 2015
Abu Dhabi sovereign wealth fund Mubadala Development Co. has held talks with potential buyers for all or part of Globalfoundries ...
InvenSense to add PUF security to sensors
Flexible sensor detects multiple ions in fluids
Microsemi sees off Skyworks to win PMC-Sierra
Starting all over again on plastic: ARM
From electronics to maths and money madness
November 23, 2015
Dennis Feucht discusses different infinities, the madness of George Cantor and what can be learned about the irrational exuberance ...
Analog IC market growth set to slow
Volkswagen deploys data glasses in series production
Startup CircuitSeed wants to be the ARM of analogue
- Battery Size Matters
- Software-Defined Radio Handbook - 11th edition
- Multichemistry Buck Battery Charger Controller
- Automotive Circuit Protection using Littelfuse Automotive TVS Diodes
InterviewCEO interview: InvenSense's Abdi on expanding MEMS horizons
InvenSense Inc. is a MEMS company that has epitomized a fabless approach to a sector that is still highly reliant on a thorough grasp of the manufacturing and packaging processes. We interviewed CEO Behrooz ...
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, FTDI Chip is giving away six MCU development board packages complete with a dedicated compiler (including a full integrated development environment).
Worth Euro 315 each, the packages include a credit card sized Clicker 2 board for the FT90X 32-bit MCU supplied alongside a powerful dedicated compiler from MikroElektronika.
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.