Magnetic domains and domain wall

Magnetization Distribution, Magnetic Domains, and Domain Walls at Surfaces... 

In dielectric materials there can be both permanent and induced polarization domains. The walls between these domains may also act as barriers to dislocation motion. They tend to have larger energies than magnetic domain walls so they may have more effect on hardness (McColm, 1990). 

Some ideas and experimental results related to the effect of switching magnetic domain walls in three- and four-arm nanostructures, fabricated from ferromagnetic (Ga,Mn)As layers, are presented. Changes in electrical resistance of those structures, accompanying switching, could be used in spintronic devices. 

Magnetic nanostructures possess promising features due to their characteristic sizes that are comparable to the spin-flip diffusion length and magnetic domain-wall width. In practice, their fabrication and characterization become increasingly difficult with feature sizes decreasing beyond the standard photolithography limit [1,2]. 

A. P. Malozemoff and J. C. Slonczewski, Magnetic Domain Walls in Bubble Materials, Academic, New York (1979). 

The internal friction of /jBN-dispersed composite steel reaches a maximum at 4 mass% ABN [2003Sue]. This is because the internal friction of the composite steel depends upon bofli flie internal fiietion due to the magnetic domain wall movement of ferrite and this one due to the deformation of ABN. Meehanieal properties are practically unaffected by dispersion of 4 mass% ABN. Experimental results suggest that a composite steel showing promise as an advanced damping material can be attained by appropriate eontrol of the microstructures of the steel part and the sintered core [2003Sue]. 

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