Resonance Properties of Single-Crystal Hexagonal Ferrites

Buffler, Charles R.

doi:10.1007/978-1-4899-6391-8_143

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…Substituting the FMR driving frequency and the saturation magnetization into the FMR condition, the out-of-plane magnetocrystalline anisotropy, H A θ , value was determined to be 32 ± 3 kOe. This value is in good agreement with published results …”

Section: Resultssupporting

confidence: 93%

“…This value is in good agreement with published results. 26 The temperature dependence of the zero-field cooled magnetization curve was measured between 5 and 900 K at an applied field strength of 100 Oe along the c-axis of the sample, 27 as depicted in Figure 6a. It is observed that the magnetization exhibits four pronounced changes with temperature at 162, 456, 680, and 759 K for the particular ferrite heterostructure studied.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale-Driven Crystal Growth of Hexaferrite Heterostructures for Magnetoelectric Tuning of Microwave Semiconductor Integrated Devices

Chen

et al. 2014

ACS Nano

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A nanoscale-driven crystal growth of magnetic hexaferrites was successfully demonstrated at low growth temperatures (25-40% lower than the temperatures required often for crystal growth). This outcome exhibits thermodynamic processes of crystal growth, allowing ease in fabrication of advanced multifunctional materials. Most importantly, the crystal growth technique is considered theoretically and experimentally to be universal and suitable for the growth of a wide range of diverse crystals. In the present experiment, the conical spin structure of Co2Y ferrite crystals was found to give rise to an intrinsic magnetoelectric effect. Our experiment reveals a remarkable increase in the conical phase transition temperature by ∼150 K for Co2Y ferrite, compared to 5-10 K of Zn2Y ferrites recently reported. The high quality Co2Y ferrite crystals, having low microwave loss and magnetoelectricity, were successfully grown on a wide bandgap semiconductor GaN. The demonstration of the nanostructure materials-based "system on a wafer" architecture is a critical milestone to next generation microwave integrated systems. It is also practical that future microwave integrated systems and their magnetic performances could be tuned by an electric field because of the magnetoelectricity of hexaferrites.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Nanoscale-Driven Crystal Growth of Hexaferrite Heterostructures for Magnetoelectric Tuning of Microwave Semiconductor Integrated Devices

Chen

et al. 2014

ACS Nano

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“…(3) in the limit |μ|< < 1 one obtains Finally, after substituting the expression for μ for the ferrite with easy-plane anisotropy 32 , we obtain in explicit form Here γ is the gyromagnetic ratio, H 0 is the bias magnetic field, 4πM S is the saturation magnetization of the ferrite, and H a is the magnetocrystalline anisotropy field. For very small values of the normalized wavevector k z,p S → 0 and resonator eigenfrequency tends to the known expression for the uniform FMR mode in easyplane ferromagnet, namely 34 As it was demonstrated in Ref. 23 the application of DC electric current to hexaferrite sample results in strong modification of "effective" magnetization 4πM eff = H a + 4πM S which is almost linearly proportional to the applied electric power P:…”

Section: Methodsmentioning

confidence: 77%

Y-type hexagonal ferrite-based band-pass filter with dual magnetic and electric field tunability

Popov

Xiong

Zavislyak

et al. 2023

Sci Rep

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This work is on the design, fabrication and characterization of a hexagonal ferrite band-pass filter that can be tuned either with a magnetic field or an electric field. The filter operation is based on a straight-edge Y-type hexagonal ferrite resonator symmetrically coupled to the input and output microstrip transmission lines. The Zn2Yfilter demonstrated magnetic field tunability in the 8–12 GHz frequency range by applying an in-plane bias magnetic field H0 provided by a built-in permanent magnet. The insertion loss and 3 dB bandwidth within this band were 8.6 ± 0.4 dB and 350 ± 40 MHz, respectively. The electric field E tunability of the pass-band of the device was facilitated by the nonlinear magnetoelectric effect (NLME) in the ferrite. The E-tuning of the center frequency of the filter by (1150 ± 90) MHz was obtained for an input DC electric power of 200 mW. With efforts directed at a significant reduction in the insertion loss, the compact and power efficient magnetic and electric field tunable Zn2Y band-pass filter has the potential for use in novel reconfigurable RF/microwave devices and communication systems.

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“…Here γ is the gyromagnetic ratio, H0 is the bias magnetic field, 4πMS is the saturation magnetization of the ferrite, and Ha is the magnetocrystalline anisotropy field. For very small values of the normalized wavevector , 0 zp kS → and resonator eigenfrequency tends to the known expression for the uniform FMR mode in easy-plane ferromagnet, namely [34] 0 00 ( 4)…”

Section: Theoretical Analysis A) Magnetostatic Waves Is Ferrite Filmsmentioning

confidence: 95%

Y-type Hexagonal Ferrite-based Band-Pass Filter with Dual Magnetic and Electric Field Tunability

Popov

Xiong

Zavislyak

et al. 2022

Preprint

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This work is on the design, fabrication and characterization of a hexagonal ferrite band-pass filter that can be tuned either with a magnetic field or an electric field. The filter operation is based on a straight-edge Y-type hexagonal ferrite resonator symmetrically coupled to the input and output microstrip transmission lines. The Zn2Y filter demonstrated magnetic field tunability in the 8-12 GHz frequency range by applying an in-plane bias magnetic field H0 provided by a built-in permanent magnet. The insertion loss and 3 dB bandwidth within this band were 8.6±0.4 dB and 350±40 MHz, respectively. The electric field E tunability of the pass-band of the device was facilitated by the nonlinear magnetoelectric effect (NLME) in the ferrite. The E-tuning of the center frequency of the filter by (1150±90) MHz was obtained for an input DC electric power of 200 mW. With efforts directed at a significant reduction in the insertion loss, the compact and power efficient magnetic and electric filed tunable Zn2Y band-pass filter has the potential for use in novel reconfigurable RF/microwave devices and communication systems.

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Resonance Properties of Single-Crystal Hexagonal Ferrites

Cited by 4 publications

References 5 publications

Nanoscale-Driven Crystal Growth of Hexaferrite Heterostructures for Magnetoelectric Tuning of Microwave Semiconductor Integrated Devices

Nanoscale-Driven Crystal Growth of Hexaferrite Heterostructures for Magnetoelectric Tuning of Microwave Semiconductor Integrated Devices

Y-type hexagonal ferrite-based band-pass filter with dual magnetic and electric field tunability

Y-type Hexagonal Ferrite-based Band-Pass Filter with Dual Magnetic and Electric Field Tunability

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