Current tunable barium hexaferrite millimeter wave resonator

Popov, M. A.; Zavislyak, I. V.; Srinivasan, G.

doi:10.1002/mop.30989

Cited by 16 publications

(12 citation statements)

References 17 publications

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“…Variations in the magnetic order parameters as a function of applied E -field were estimated from data on FMR frequencies in both multidomain and single domain states and the changes in the saturation magnetization M s and uniaxial anisotropy field H a were found to vary as E 2 . The NLME phenomenon also has significant potential for E -tunable millimeter wave ferrite devices such as resonators and filters 33 . The tuning of the FMR due to NLME was at least 10 times larger than those reported due to linear ME effects in ferrite-ferroelectric composites 29 , 30 .…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magnetoelectric effects in Al-substituted strontium hexaferrite

Liu

Popov

Zavislyak

et al. 2021

Sci Rep

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This report is on the observation and theory of electric field E induced non-linear magnetoelectric (NLME) effects in single crystal platelets of ferrimagnetic M-type strontium aluminum hexagonal ferrite. Using microwave measurement techniques, it was found that a DC electric field along the hexagonal c-axis results in significant changes in the saturation magnetization and uniaxial magneto-crystalline anisotropy field and these changes are proportional to the square of the applied static electric field. The NLME effects were present with or without an external bias magnetic field. The E-induced variation in magnetic order parameters is attributed to weakening of magnetic exchange and spin–orbit interactions since conduction electrons in the ferrite are effectively excluded from both interactions while being in transit from one Fe ion to another. We present a phenomenological theory which considers magneto-bielectric effects characterized by a quadratic term in electric field E in the free energy density. The coefficients for the NLME coupling terms have been calculated from experimental data and they do show variations with the Al substitution level and the largest rates of change of the saturation magnetization and anisotropy constant change with the applied power were observed for x = 0.4. It was also clear from the study that strength of the NLME effect does not depend on the amount Al substitution, but critically depends on the electrical conductivity of the sample with the highest NLME coefficients estimated for the sample with the highest conductivity. Results of this work are of importance for a new family of electric field tunable, miniature, high frequency ferrite devices.

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Section: Introductionmentioning

confidence: 99%

Nonlinear magnetoelectric effects in Al-substituted strontium hexaferrite

Liu

Popov

Zavislyak

et al. 2021

Sci Rep

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“…This work also shows that heterostructures made up of ultrathin magnetic layers, which are easily integrated into circuits and on-wafer devices, have the ability to be used for signal processing applications. Although magnetic elements are widely present for applications in the 1--50 GHz [9][10][11] this opens the way for those applications to be extended to much higher frequencies between 50 GHz and 1 THz. An entire cell effective medium method [28][29][30] is used to find the magnetic susceptibility of the magnetic composite material, so that the material's interaction with infrared radiation can be calculated in the next subsection.…”

Section: Discussionmentioning

confidence: 99%

“…[3][4][5] Compared to other technologies that produce similar devices, magnetic materials have the advantage of being tunable (on application of external fields) and easily-integrable into on-wafer devices. Materials including Yttrium Iron Garnett (YIG), [4,6] metals such as iron and Permalloy, [3,7,8] and barium-hexaferrite [9][10][11] have all been used with particular advantages to each material.…”

Section: Introductionmentioning

confidence: 99%

Far-Infrared Reflection from Heterostructures Made of Ultrathin Ferromagnetic Layers

et al. 2019

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Recent progress has been made in creating terahertz magnons using ultrathin ferromagnetic layers. Due to their short lifetimes, these can be difficult to measure. Here we detail a calculation that shows that infrared magnons can be detected using standard reflection and attenuated total reflection measurements from a thin film heterostructure made up of alternating ultrathin magnetic and nonmagnetic layers. We use an entire-cell effective medium calculation to find the magnetic permeability of the heterostructure and then use electromagnetic boundary conditions to calculate reflectivity as a function of frequency. There are appreciable dips in the reflectivity at infrared magnon resonance frequencies, for realistic material parameters. Moreover, the strong coupling of magnon-photons indicates the possible use of 50 GHz -1 T Hz magnons in integrated signal processing devices.

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“…1a), signifying there are no additional absorption bands except the one at 2-3 cm -1 in the range. As for the microscopic origin of the detected GHz band, we cannot exclude that it can be of mixed magneto-electric origin 30,31 . Some evidence for that is given by the coincidence (within experimental uncertainties) of its frequency position with the value of the frequency of ferromagnetic resonance in the Ba 0.9 Pb 0.1 Fe 12 O 19 crystal obtained by extrapolation of the magnetic field-dependent frequency of the resonance to zero magnetic field (Fig.…”

Section: Gigahertz Resonancesmentioning

confidence: 93%

“…Being planar, self-biased and low-loss materials, hexaferrites meet the requirements of modern microwave and THz circulators, phase-shifters, filters, isolators and millimeter wave resonators antennas 15,16,30,52 . The fact that these compounds are considered nowadays as one of the most promising material classes for telecommunication systems has been clearly demonstrated in a recent work [42] .…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Lead-substituted barium hexaferrite for tunable terahertz optoelectronics

Alyabyeva

Prokhorov

Винник

et al. 2021

Preprint

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In recent years, due to their outstanding dielectric and magnetic properties, hexagonal ferrites (hexaferrites) have attracted considerable interest for developing electronic components of next-generation communication systems. The complex crystal structure of hexaferrites and critical dependences of their electric and magnetic properties on external factors, like magnetic or electric fields, pressure or doping, open ample opportunities for targeted tuning of these properties when designing specific devices. To that end, we explored the electromagnetic properties of the Pb-substituted barium hexaferrite, Ba1-xPbxFe12O19, a compound featuring an extremely rich set of physical phenomena that are inherent in the dielectric and magnetic subsystems of the material and are expected to have significant effect on its electromagnetic response at radio and terahertz frequencies. We performed the first detailed measurements of the AC response of single-crystalline Ba1-xPbxFe12O19 in an extremely broad spectral range from 1 Hz to 240 THz down to temperatures as low as 5 K. We fully characterized numerous microscopic phenomena that determine the broad-band dielectric response of the compound, and we analyzed their nature. This includes temperature-activated radiofrequency relaxations that were attributed to the dynamic response of magnetic/dielectric domains. The terahertz response is dominated by a ferroelectric-like soft mode with an unusual temperature behavior that we explain by means of a microscopic model. Several narrower terahertz excitations are associated with electronic transitions between the fine-structure components of the Fe2+ground state. Narrow resonances detected in the gigahertz region are presumably of magneto-electric origin. The obtained data on diverse but controllable electromagnetic properties of Ba1-xPbxFe12O19 compounds provides the researchers with information that makes the entire class of hexaferrites materials attractive for manufacturing electronic devices for the radiofrequency and terahertz ranges, such as absorbing coatings, anti-reflective coatings, absorbers, electromagnetic shields, antennas, phase shifters, filters, resonators, modulators, etc.

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Current tunable barium hexaferrite millimeter wave resonator

Cited by 16 publications

References 17 publications

Nonlinear magnetoelectric effects in Al-substituted strontium hexaferrite

Nonlinear magnetoelectric effects in Al-substituted strontium hexaferrite

Far-Infrared Reflection from Heterostructures Made of Ultrathin Ferromagnetic Layers

Lead-substituted barium hexaferrite for tunable terahertz optoelectronics

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