Advantages of Ferromagnetic Nanoparticle Composites in Microwave Absorbers
- 18 May 2004
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 40 (3), 1679-1684
- https://doi.org/10.1109/tmag.2004.826622
Abstract
Composites with nanosize ferromagnetic particles can be useful in microwave absorbers, since nanoparticles exhibit distinct magnetic properties compared to bulk materials. This paper examines theoretically the properties of composites with nanoparticles, the key material parameters, and the characteristics of a single-layer absorber made from a nanoparticle composite. In such an absorber, high magnetic losses over a wide frequency range induce a series of strong and wide absorption peaks at increasing frequencies. By using metallic (iron and cobalt) nanoparticles, absorbers with relatively low volume fraction of metallic inclusions can be made. The paper compares the characteristics of nanocomposite absorbers to those of common dielectric or ferromagnetic absorbers and identifies the potential advantages of nanocomposite absorbers. Because nanocomposite absorbers combine advantages of both dielectric and ferromagnetic absorbers and have significantly better characteristics, they could become essential for production of microwave and millimeter-wave absorbers.Keywords
This publication has 20 references indexed in Scilit:
- Microwave Absorption Properties of Fe-SiO2 Nanocomposite PowderJournal of the Japan Institute of Metals and Materials, 2002
- Magnetic Properties and Microwave Absorption Properties of Polymer-Protected Cobalt NanoparticlesMATERIALS TRANSACTIONS, 2002
- Precessional effects in the linear dynamic susceptibility of uniaxial superparamagnets: Dependence of the ac response on the dissipation parameterPhysical Review B, 2001
- Microwave absorptive behavior of ZnCo-substituted W-type Ba hexaferrite nanocrystalline composite materialJournal of Magnetism and Magnetic Materials, 2000
- Ferromagnetic resonance in ferrite nanoparticles with uniaxial surface anisotropyJournal of Applied Physics, 1999
- Thermally Activated Relaxation Time of a Single Domain Ferromagnetic Particle Subjected to a Uniform Field at an Oblique Angle to the Easy Axis: Comparison with Experimental ObservationsPhysical Review Letters, 1998
- Thermal variation of the relaxation time of the magnetic moment of - nanoparticles with interparticle interactions of various strengthsPhysical Review B, 1996
- The microwave absorbing phenomena of ferrite microwave absorbersIEEE Transactions on Magnetics, 1993
- Broadband magnetic microwave absorbers: fundamental limitationsIEEE Transactions on Magnetics, 1993
- A dynamic study of small interacting particles: superparamagnetic model and spin-glass lawsJournal of Physics C: Solid State Physics, 1988