Advantages of ferromagnetic nanoparticle composites in microwave absorbers
Advantages of ferromagnetic nanoparticle composites in microwave absorbers
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DOI：
10.1109/tmag.2004.826622
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发表时间：
2004-05-01
影响因子：
2.1
通讯作者：
Bregar, VB
中科院分区：
文献类型：
--
作者：
Bregar, VB
纳米铁磁性颗粒的复合材料可用于微波吸收材料，因为纳米颗粒与块体材料相比显示出不同的磁性。本文从理论上研究了纳米颗粒复合材料的性能、关键材料参数以及由纳米颗粒复合材料制成的单层吸波材料的特性。在这种吸波材料中，在很宽的频率范围内，高的磁损耗会在不断增加的频率上引起一系列强而宽的吸收峰。通过使用金属(铁和钴)纳米颗粒，可以制造出金属夹杂物体积分数相对较低的吸收材料。比较了纳米复合吸波材料与普通介电吸波材料和铁磁吸波材料的特性，指出了纳米复合吸波材料的潜在优势。由于纳米复合吸波材料结合了介电吸波材料和铁磁吸波材料的优点，并且具有明显更好的特性，因此它们可能成为生产微波和毫米波吸波材料的关键。
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.