Amplitude and Phase Tuning of Microwave Signals in Magnetically Biased Permalloy Structures

Abstract

In this paper, a permalloy layer has been employed in the fabrication of a coupled line electromagnetic bandgap (EMBG) device to tune both amplitude and phase. A magnetically biased microwave coplanar configuration manufactured with evaporated permalloy has been measured, and a circuit modelling has been studied to evaluate the measured effects in terms of variable attenuation and phase shift. Starting from a permalloy made by the mixture 80% nickel and 20% iron content, we fabricated an electromagnetic bandgap (EMBG) structure based on a periodic arrangement of single sections of a transmission line with variable impedance, also including a central region with coupled lines. The bandpass characteristics of the EMBG device can be tuned by changing permalloy's permeability through the application of a DC magnetic field H0 (parallel to the plane of the structure). In particular, using a magnetic field up to 3000 Oe, it was possible to change the phase by ca. 45° and the amplitude by ca. 7 dB in the X band.

Review—Recent Advances in Microfabrication, Design and Applications of Amperometric Sensors and Biosensors

“…6). The master PVC ion-sensitive membrane (ISM) contained polyvinyl chloride (PVC), 2-nitrophenyl octyl ether (NPOE), tetrakis (4-chlorophenyl) boron potassium (KTPCB), and calix [4]arene (CX4) in tetrahydrofuran (THF). The Cu/POT electrode showed an R ct value of 5.5 Ω, significantly lower than the value for Cu electrode (624 Ω), proving the enhancing in electron transfer through polymer modification of the Cu area.…”

“…In recent years, microfabrication technology has been widely used for the development of complex electronic components, [4][5][6] integrated micro-electromechanical systems (MEMS), and different types of sensors for a wide range of applications. The benefits of developing sensors with such technological processes include low costs, large scale fabrication of nominally identical structures, the possibility of integration with other devices and the compatibility with a numerous of technologies, such as complimentary metal-oxide semiconductor technology (CMOS) for the manufacturing of integrated circuits or silicon on insulator (SOI) technology for semiconductor engineering.…”

Local Characterization of Ferromagnetic Resonance in Bulk and Patterned Magnetic Materials Using Scanning Microwave Microscopy

“…Permalloy is used for several electronic applications, including FMRdriven high-speed transmission lines [28] or sensing [29]. Generally speaking, Py is chosen, like several other magnetic materials, including YIG, for magnetically tunable solutions [30], [31]. The proposed microwave microscopy approach may lead to a development of a tool for local FMR mapping with high spatial resolution as the setup is integrated with an atomic force microscopy (AFM) and the measurements are performed directly in the microwave regime by utilizing the higher dynamic range of the vector network analyzer (VNA).…”