Oriented barium hexaferrite thick films with narrow ferromagnetic resonance linewidth

Chen, Yajie; Sakai, Tomokazu; Chen, Taiyang; Yoon, S. D.; Geiler, Anton L.; Vittoria, C.; Harris, Vincent G.

doi:10.1063/1.2173240

Cited by 107 publications

(57 citation statements)

References 11 publications

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“…Ferrites, such as ferrimagnetic barium hexaferrite BaFe 12 O 19 (BaM), can play an important role in the propagation of electromagnetic waves in microwave and millimeter wave devices (such as tunable filters, phase shifters, and circulators) due to their low losses in the gigahertz frequencies and high magnetic anisotropy [347]. Growing thick films and multilayers of ferrite/ferroelectric (such as BaTiO 3 or PZT) compounds produces coupling of the magnetic response and ferroelectricity mediated by mechanical stress [348].…”

Section: Other Applicationsmentioning

confidence: 99%

Interface effects in spin-polarized metal/insulator layered structures

Velev

Dowben

Tsymbal

et al. 2008

Surface Science Reports

113

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Recent advances in thin-film deposition techniques, such as molecular beam epitaxy and pulsed laser deposition, have allowed for the manufacture of heterostructures with nearly atomically abrupt interfaces. Although the bulk properties of the individual heterostructure components may be well-known, often the heterostructures exhibit novel and sometimes unexpected properties due to interface effects. At heterostructure interfaces, lattice structure, stoichiometry, interface electronic structure (bonding, interface states, etc.), and symmetry all conspire to produce behavior different from the bulk constituents. This review discusses why knowledge of the electronic structure and composition at the interfaces is pivotal to the understanding of the properties of heterostructures, particularly the (spin polarized) electronic transport in (magnetic) tunnel junctions.

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Section: Other Applicationsmentioning

confidence: 99%

Interface effects in spin-polarized metal/insulator layered structures

Velev

Dowben

Tsymbal

et al. 2008

Surface Science Reports

113

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“…For x=0.0, it exhibits 4πM s =3.78 kGs, and H a =17.6 kOe, which is similar to previously reported from bulk barium and strontium hexaferrite materials. 18,19 Furthermore, a higher LaCo concentrations leads to increasing magnetocrystalline anisotropy H a and otherwise lower saturation magnetization 4πM s . Such enhancements in H a could result in the shifting of observing FMR to higher frequencies.…”

Section: Resultsmentioning

confidence: 99%

Tunable ferromagnetic resonance in La-Co substituted barium hexaferrites at millimeter wave frequencies

Korolev

Zhong

et al. 2018

AIP Advances

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Transmittance measurements have been performed on La-Co substituted barium hexaferrites in millimeter waves. Broadband millimeter-wave measurements have been carried out using the free space quasi-optical spectrometer, equipped with a set of high power backward wave oscillators covering the frequency range of 30 – 120 GHz. Strong absorption zones have been observed in the millimeter-wave transmittance spectra of all La-Co substituted barium hexaferrites due to the ferromagnetic resonance. Linear shift of ferromagnetic resonance frequency as functions of La-Co substitutions have been found. Real and imaginary parts of dielectric permittivity of La-Co substituted barium hexaferrites have been calculated using the analysis of recorded high precision transmittance spectra. Frequency dependences of magnetic permeability of La-Co substituted barium hexaferrites, as well as saturation magnetization and anisotropy field have been determined based on Schlömann’s theory for partially magnetized ferrites. La-Co substituted barium hexaferrites have been further investigated by DC magnetization to assess magnetic behavior and compare with millimeter wave data. Consistency of saturation magnetization determined independently by both millimeter wave absorption and DC magnetization have been found for all La-Co substituted barium hexaferrites. These materials seem to be quite promising as tunable millimeter wave absorbers, filters, circulators, based on the adjusting of their substitution parameters.

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“…In addition to thin film growth, thick films (>10 lm) have also been demonstrated via spin coating 53 and printing 54 techniques with porosity levels acceptable for certain applications. It is also worth mentioning that Abe et al 55 has been reported on other complex oxide systems by the SSP technique.…”

Section: Csdmentioning

confidence: 99%

Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components

Subramanyam¹,

Cole²,

Sun³

et al. 2013

Journal of Applied Physics

147

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There has been significant progress on the fundamental science and technological applications of complex oxides and multiferroics. Among complex oxide thin films, barium strontium titanate (BST) has become the material of choice for room-temperature-based voltage-tunable dielectric thin films, due to its large dielectric tunability and low microwave loss at room temperature. BST thin film varactor technology based reconfigurable radio frequency (RF)/microwave components have been demonstrated with the potential to lower the size, weight, and power needs of a future generation of communication and radar systems. Low-power multiferroic devices have also been recently demonstrated. Strong magneto-electric coupling has also been demonstrated in different multiferroic heterostructures, which show giant voltage control of the ferromagnetic resonance frequency of more than two octaves. This manuscript reviews recent advances in the processing, and application development for the complex oxides and multiferroics, with the focus on voltage tunable RF/microwave components. The over-arching goal of this review is to provide a synopsis of the current state-of the-art of complex oxide and multiferroic thin film materials and devices, identify technical issues and technical challenges that need to be overcome for successful insertion of the technology for both military and commercial applications, and provide mitigation strategies to address these technical challenges. V C 2013 AIP Publishing LLC.

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Oriented barium hexaferrite thick films with narrow ferromagnetic resonance linewidth

Cited by 107 publications

References 11 publications

Interface effects in spin-polarized metal/insulator layered structures

Interface effects in spin-polarized metal/insulator layered structures

Tunable ferromagnetic resonance in La-Co substituted barium hexaferrites at millimeter wave frequencies

Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components

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