A cut-off millimeter wave resonator technique for mapping magnetic parameters in hexagonal ferrites

Abstract

A high-frequency technique (50 GHz) for determining the magnetic parameters from localized excitations in magnetic materials has been proposed and used for the case of barium hexaferrites. The technique involves the formation of a cut-off resonator in a metal iris–ferrite–metal structure in which magnetostatic forward volume waves are excited only in the region under the iris. Magnetic and high-frequency parameters obtained for barium hexaferrite are in agreement with previously reported values. The possibility of extending the technique for mapping magnetic parameters for films on large substrates is discussed.

Simple sol-gel auto-combustion synthesis and characterization of lead hexaferrite by utilizing cherry juice as a novel fuel and green capping agent

“…Hexagonal ferrites are group of ceramic magnets having large technological applications as permanent magnets, nanoelectromagnetic devices, microwave devices and magnetic recording media [1]. M-type hexagonal ferrites have appeared as novel materials with great technological and scientific interest considering their brilliant physical properties such as dependable magnetization, high coercive force, large magnetocrystalline anisotropy and relatively high Curie temperature, as well as notable chemical stability and low cost.…”

Enhanced Magnetization of Sol‐Gel Synthesized Pb‐Doped Strontium Hexaferrites Nanocrystallites at Low Temperature

“…M-type hexagonal ferrites belong to immensely valuable class of magnetic materials, with a host of applications ranging from simple permanent magnets used in electric motors to modern day applications, for instance, as radar wave absorbing materials. Owing to its high values of saturation magnetization and coercivity [1], strontium hexaferrite, in particular, is a very important member of this class of magnetic materials, being widely used in telecommunication [2], magnetooptic recording media, microwave devices [3], and electronic industry [4]. Various preparation techniques like coprecipitation process, molten salt method, solid state reaction method [5], double sintering ceramic technique [6], microwave-induced combustion process, sol-gel based synthesis routes [7], and so forth have been adopted by the researchers to refine the astonishing structural and magnetic properties of these ferrites.…”

“…Diamagnetic Pb ions, substituted at Fe sites with spin up, could enhance the hard magnetic characteristics of SrFe 12 O 19 when doped stoichiometrically. Hence, it has been understood as a quite suitable dopant choice for these ferrites to improve not only the structural properties but also the magnetic properties [2,3,8]. In the present work, we have successfully employed sol-gel based autocombustion technique to prepare the ferrite samples in phase-pure form to investigate the structural and low temperature magnetic properties of Pb-doped strontium hexaferrites for use in devices that work efficiently with high values of coercivity and electrical devices that show minimum energy losses at higher applied frequencies.…”

A comparative study on the magnetic properties of MFe12O19 and MAlFe11O19 (M=Sr, Ba and Pb) hexaferrites with different morphologies

“…Hexagonal ferrite is a class of ceramic magnets having large technological applications as permanent magnets, nanoelectromagnetic devices, microwave devices and magnetic recording media [1]. Garcia-Cerda et al [2] have synthesized strontium ferrite by sol-gel route and found that the coercivity of the powder increases with increasing temperature up to 800 8C then it decreases with further increase of temperature because of increasing particle size.…”