Magnetic domains, observation

The magnetite particles so produced were stabilized by protective colloids such as gelatin for use in magnetic domain observations. These precipitated magnetite particles are used for production of magnetic fluids, as we describe later. 

Tsuno, K. (1988). Magnetic domain observation by means of Lorentz electron microscopy with scanning technique. Reviews of Solid State Science, 2,623 58. 

Figure 6 Scanning Karr image of the magnetization changes in the indirection for a thin-film head having a 1-MHz, 5-mA p-p coil current, and the magnetic domain pattern deduced for this head from the observed domain wall motion. ...

For films formed at Ts below 405 (i.e. with grains below 5 nm) the measured hysteresis loops and the observations of the magnetic domains in applied magnetic fields seem to... 

It is also interesting to point to the so-called gyromagnetic effect, observed in Fe-Si-B amorphous wires with a particular magnetic-domain structure (Chiriac et al. 2000b). 

Historically dispersions of small magnetic particles having a superparamagnetic nature were used for the observation of magnetic domains. Recently nanoparticles have been intensively studied because of their unique physical properties, which cannot be achieved by bulk materials. 

Haag M, Heller F, Lutz M, Reusser E (1993) Domain observations of the magnetic phases in volcanics with self-reversed magnetization. Geophys Res Lett 20 675-678 Haggerty SE (1991) Oxide textures—a mini-atlas. Rev Mineral 25 129-219... 

It is the "second generation" of solid state techniques, in which the onset of relaxation of magnetization is observed in the time domain, which offer promise for the detailed, In-sltu investigation of early diagenetic processes. For example, Hagaman and Woody (19) showed that the time dependence of cross polarization could be used to Improve the resolution of complex spectra of coal, since different carbon types cross polarize at different rates. Wilson (20-21) has used dipolar dephaslng to distinguish carbon types in soils and resins based on relaxation rates. 

Fig. 7.1 Magnetic domain images were observed through the Kerr effect of Co-Ni-Fe-P soft magnetic underlayer on a disk substrate electroless-deposited (a) without and (b) with an external appUed magnetic field. The thickness of each sample is 1 pm [15]. 2004 IEEE...

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