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 | Toyohashi University
Astronomers find unexpected, dust-obscured star formation in distant galaxy
24.03.2017 | University of Massachusetts at Amherst
Gravitational wave kicks monster black hole out of galactic core
24.03.2017 | NASA/Goddard Space Flight Center
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
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Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
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