Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ultra high sensitivity magnetic field sensors: The attraction of magnonic crystals

19.09.2011
Highly sensitivity devices for the measurement of weak magnetic fields are important in medicine for applications such as monitoring heart and brain activities. Furthermore, mapping the distributions and magnitudes of weak magnetic fields can provide a deeper insight into neuroscience and brain-machine interfaces.

Here, Mitsuteru Inoue and colleagues at Toyohashi University of Technology demonstrate that magnonic crystals—artificial magnetic crystal structures for controlling the propagation of magnetostatic waves—exhibit properties enabling the fabrication of extremely sensitive magnetic field sensors operable at room temperature.

Magnonic crystals support the propagation of magnetostatic waves through the crystal spin system or suppress the propagation of waves due to the periodicity of the crystal structure. In this research the Toyohashi Tech researchers fabricated magnonic crystals by the direct formation of one-dimensional arrays of metal strips on top of yttrium iron garnet, which serves as the propagation medium.

The metal stripes induced an attenuation band in the frequency spectra of the magnonic crystal, and the propagation of waves with the corresponding frequencies was strictly prohibited.

The frequency of the attenuation band was very sensitive to an external magnetic field applied to the crystal, where a 1 Oe change in the field resulted in a 2.6 MHz shift in the band gap. The maximum detection sensitivity of the magnonic crystals was more than 10 times greater that of a giant magneto-impedance element.

The next challenge for the researchers is to demonstrate the measurement of magnetic fields in three dimensions, which is possible using two-dimensional magnonic crystals.

Reference:
Mitsuteru Inoue, Alexander Baryshev, Hiroyuki Takagi, Pang Boey Lim, Kohei Hatafuku, Josho Noda, and Kenji TogoInvestigating the use of magnonic crystals as extremely sensitive magnetic field sensors at room temperatureApplied Physics Letters 98, 132511 (2011)DOI: 10.1063/1.3567940Department of Electrical and Electronic Engineering, Toyohashi University of Technology, JapanDepartment website: Inoue Lab: http://www.maglab.eee.tut.ac.jp/eng-index.html

Mitsuteru Inoue | Toyohashi University
Further information:
http://www.tut.ac.jp/english/newsletter/research_highlights/research01.html
http://www.maglab.eee.tut.ac.jp/eng-index.html

More articles from Physics and Astronomy:

nachricht Further Improvement of Qubit Lifetime for Quantum Computers
09.12.2016 | Forschungszentrum Jülich

nachricht Electron highway inside crystal
09.12.2016 | Julius-Maximilians-Universität Würzburg

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

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

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>