NDLI: Engineering approach to calculate the effective permeability of a composite material with unbiased ferrimagnetic nanoparticles

Content Provider	IET Digital Library
Author	Kyriakou, John G. Chryssomallis, Michael T.
Abstract	A step-by-step engineering approach offering a model for the characterization of magnetic composite materials is presented. The modelling of composite materials containing unbiased ferrites is a subject of great interest, due to extended range of applications, such as hyperthermia and microwave absorbers. Here, unbiased ferrites simplify the application structure, as they do not require a biasing field, while they can resonate at low microwave frequencies due to their innate magnetocrystalline anisotropy field. However, so far there has not been an explicit organized step-by-step engineering modelling approach. The homogenization approximation formula is used in conjunction with Landau–Lifshitz–Gilbert equation solution to systematically compute the complex effective permeability and compare it with published measurements, from an engineer's result-focused perspective. For further validation, simulations of these composite materials as periodic structures are carried out, which additionally provide useful insight on the electromagnetic field distributions within the composites and are often more accurate. The results of the proposed procedure show good agreement with the experimental ones, which validate it, while the relatively greater error appears for the imaginary parts. The EM field distributions suggest that better focusing around the nanoparticles is achieved when those are large enough to form magnetic domains.
Starting Page	749
Ending Page	754
Page Count	6
ISSN	17518725
Volume Number	11
e-ISSN	17518733
Issue Number	Issue 5, Apr (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/11/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0593
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2016-12-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Barkhausen Collective Excitations (surface States) Effective Permeability Electromagnetic Field Electromagnetic Field Distributions Ferrimagnetics Ferrites Homogenisation Approximation Hyperthermia Absorbers Hysteresi Landau Levels Landau-Lifshitz-Gilbert Equation Magnetic Anisotropy Magnetic Composite Material Magnetic Domain Magnetic Domain Walls And Domain Structure Magnetic Permeability Magnetic Property of Nanostructure Magnetization Curves Magnetocrystalline Anisotropy Field Microwave Absorbers Nanocomposite Nanoparticle Periodic Structure Step-by-step Engineering Approach Unbiased Ferrimagnetic NanoParticle Unbiased Ferrites
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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