Metal oxides magnetic

This technique could be combined with the in situ approach by generating metal or metal oxide magnetic particles in a magnetic field,75,76 for example by the thermolysis or photolysis of a metal carbonyl. As mentioned earlier, some related work involved the use of in situ techniques to generate electrically conducting fillers such as polyaniline within PDMS.28... 

Kato, Y. and Takei, T. (1933) Characteristics of metallic oxide magnet, J. Inst. Elect. Eng. Japan, 53, 408-12 (in Japanese). 

In recent years, the growing numbers of publications are concerned with ultra-fine metal oxide structures because of their useful applications as bactericides, adsorbents, energy storage media, magnetic data storage, and ferrofluids and specifically as catalysts [6, 7]. 

Chemical reagents are primarily concerned with dielectric liquids or solids. For metal oxides such as ferrites, however, magnetic losses occur in the microwave region. As for a dielectric material, a complex magnetic permeability is defined as given by Eq. (16) ... 

The real part is the magnetic permeability whereas the imaginary part is the magnetic loss. These losses are quite different from hysteresis or eddy current losses, because they are induced by domain wall and electron-spin resonance. These materials should be placed at position of magnetic field maxima for optimum absorption of microwave energy. For transition metal oxides such as iron, nickel, and cobalt magnetic losses are high. These powders can, therefore, be used as lossy impurities or additives to induce losses within solids for which dielectric loss is too small. 

---