Interface-engineered barium hexaferrite-wide-bandgap semiconductor integration enabling 5G system-on-wafer solutions

2023

• Computer Science
• Optoelectronics
• Materials science

Transition from fourth to fifth generation wireless technologies requires a shift from 2.3 GHz to Ka-band with the promise of revolutionary increases in data handling capacity and transfer rates at greatly reduced latency among other benefits. A key enabling technology is the integration of Ka-band massive multiple input–multiple output (m-MIMO) antenna arrays. m-MIMO array elements simultaneously transmit and receive (STAR) data providing true full duplexing in time and frequency domains. A necessary innovation calls for the integration of device quality Ka-ferrites with wide-bandgap (WBG) semiconductor heterostructures allowing for system on-wafer solutions. Here, we report results of systematic studies of pulsed laser deposited (PLD) barium hexaferrite (BaM) films on industrial compatible WBG semiconductor heterostructures suitable for operation in Ka-band circulators.

Societal Benefits of Ferrites

2022-10-28 · 2 citations

Crystallographically Textured and Magnetic LaCu-Substituted Ba-Hexaferrite with Excellent Gyromagnetic Properties

Materials · 2022-12-09 · 4 citations

Excellent gyromagnetic properties of textured, bulk Ba-hexaferrite samples are required for low-loss, self-biased applications for microwave and millimeter-wave (MMW) devices. However, conventionally processed bulk Ba-hexaferrite ceramics typically demonstrate low remanent magnetization values, 4πMr, of 2.0~3.0 kG, and relatively large ferromagnetic resonance (FMR) linewidths, ΔHFMR, of 0.8~2 kOe. These properties lead to the development of high-performance, practical devices. Herein, crystallographically textured Ba-hexaferrite samples, of the composition Ba0.8La0.2Fe11.8Cu0.2O19, having excellent functional properties, are proposed. These materials exhibit strong anisotropy fields, Ha, of ~14.6 kOe, high remanent magnetization, 4πMr, of 3.96 kGs, and a low ΔHFMR of 401 Oe at zero-bias field at the Q-band. Concomitantly, the broadband millimeter-wave transmittance was utilized to determine the complex permeability, μ*, and permittivity, ε*, of textured hexaferrites. Based on Schlöemann’s theory of complex permeability, μ*, the remanent magnetization, 4πMr, anisotropy field, Ha, and effective linewidth, ΔHeff, were estimated; these values agree well with measured values.

Emerging magnetodielectric materials for 5G communications: 18H hexaferrites

Acta Materialia · 2022 · 70 citations

• Materials science
• Nuclear magnetic resonance
• Optoelectronics

Ferrite Inductor Cores for <scp>MH</scp> z‐Frequency Applications

2022-11-04 · 2 citations

Tackling thermal management and power consumption challenges, one aims to suppress inductor core power loss (CPL), as one of the major sources of inefficiency in these systems and is the main focus of this chapter. Novel designs and synthesis strategies are proposed for addressing dissipation mechanisms responsible for efficiency of inductor cores at high operating frequencies. Findings presented show remarkable suppression of the CPL by means of significantly reducing eddy currents and residual losses in MnZn-ferrite-based nanocomposites. The chapter presents a review of spinel ferrite compositions and structures with special attention paid to grain boundary chemistry and structure and its role in determining inductor performance in power generation, conversion, and conditioning applications. Ferrite compositions and ceramic processing protocols, including complex sintering practices, are reported and discussed at length as to their impact upon frequency-dependent performance.

Low‐Temperature Co‐Fired Magnetoceramics for <scp>RF</scp> Applications

2022-11-04 · 1 citations

Front Matter

2022-11-04

Index

2022-11-04

Effects of Y–Co co-substitution on the structural and magnetic properties of M-type strontium hexaferrites

Ceramics International · 2021-06-09 · 26 citations