Domain wall energy

The expression for the domain wall energy and depolarization field energy of the elongated half-ellipsoidal domain has been obtained by Landauer [63] ... 

Domain wall energy and thickness for a 180° wall, calculated from the minimum in exchange and anisotropy contributions (Landau Lifshitz, 1935) can be expressed respectively as ... 

Domain wall energy in ferrites is expected to be smaller than in metals because Tq and Kj are smaller and a is larger wall thickness is smaller as well. Estimates in Ni ferrite lead to = 6 x lO" J/m and 60 unit cells. 

Guyot, M. Globus, A. (1977). Determination of the domain wall energy and the exchange constant from hysteresis in ferrimagnetic polycrystals. Journal de Physique (Paris), CI-38, Cl-157-62. 

To estimate the temperature evolution of the entire domain structure we express its energy at T = 0 (i.e. at f = —1) in the Kittel approximation, assuming a kink-like structure of the domain wall and a flat profile of a polarization inside domains. The calculations are similar to those for the domain structure of the uniaxial ferroelectric film surrounded by paraelectric dead layers and embedded into short circuited capacitor [27]. The free energy is superimposed from the domain walls energy and electrostatic contributions ... 

P E), where is the domain wall energy per unit area, E is the strength of the static... 

So spin value of iron obtained Tw domain wall energy... 

The size and orientation of the magnetic domains depend on minimization of magnetostatic, magnetocrystalline anisotropy, magnetostiictive, and domain wall energies. 

Lower Curie temperatures and greater atomic spacing (greater domain wall width) reduces the domain wall energy. 

Domain wall energy is associated with the energy of formation of the dividing domain walls a surface tension, comprised of components 1-4 giving a resultant energy per unit area of wall. 

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