Abstract
The creation of a domain wall pair in the magnetic core of amorphous glass-coated bistable microwires with circular cross-section is studied. Energy balance is formulated in the spirit of particle decay, equalizing magnetic field work and energy of two domain walls, emitted in opposite directions. The critical nucleation field is evaluated and compared with observations.
Highlights
The domain structure of ferromagnets and ferrimagnets is conventionally explained as a result of minimizing the free energy, waphpicrohxiimn amtioicnroM⃗m(a→grn)e,taicsmthoeootrhylyisvaerxypinregsvseedctoinr the continuum function of constant norm, supposing that its typical space scale essentially exceeds inter-atomic distance
We return to the paper13 where the local nucleation field is studied in the context of the domain wall (DW) dynamics
A link of the nucleation field value and the DW parameters is of interest
Summary
The domain structure of ferromagnets and ferrimagnets is conventionally explained as a result of minimizing the free energy, waphpicrohxiimn amtioicnroM⃗m(a→grn)e,taicsmthoeootrhylyisvaerxypinregsvseedctoinr the continuum function of constant norm, supposing that its typical space scale essentially exceeds inter-atomic distance. In the paper the first term of the expression is estimated as prevailing and connected with formula for anisotropy constant K and applied for evaluation of Hn that is compared with results of measurements This result is based on stationary version of the Brown theory, as it does not contain information about dynamics and domain wall (DW) form. The DW form, defined as the magnetic moment distribution in space, we take as an exact stationary solution of LLG equation, extracting the necessary anisotropy parameter from explicit expression for mobility as in Ref. 12. Note, that it is, perhaps, the only possibility for amorphous microwire now. If in some case all necessary parameters are known, a comparison of the evaluated and measured H0 confirms the developed theory
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