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Equilibrium position of the electron and nuclear magnetization vectors for each sub-lattice.

Equilibrium position of the electron and nuclear magnetization vectors for each sub-lattice.

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We present a new theoretical description of the coupled electron-nuclear spin systems which takes into account an indirect relaxation of nuclear spins via the electron subsystem. In our theory the magnitude of the nuclear magnetization is conserved for arbitrary large excitation powers, similar to the Landau-Lifshitz-Gilbert model of relaxation. Th...

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Context 1
... the antiferromagnet MnCO 3 considered here, this anisotropy is the easy-plane which corresponds to the con- dition K > 0. The Dzyaloshinskii-Moriya interaction which is responsible for non-collinearity of the M 1 and M 2 sub- lattices, see Fig. 3, is described ...
Context 2
... h(t)=0, the condition of minimum of the functional (14) defines the equilibrium orientation of the vectors M 1,2 and m 1,2 , see Fig. 3. The small angle ψ in this figure is deter- mined from the ...
Context 3
... equilibrium orientations due to rf magnetic field at frequencies close to the q-NMR resonance. Following the previous work, 53 it is convenient to introduce a separate ref- erence frame x 1 y 1 y 1 (x 2 y 2 z 2 ) for sublattice M 1 (M 2 ) obtained from the original frame xyz by a clockwise rotation around z- axis by angle ψ (by angle π − ψ), see Fig. 3, and chose new variables according ...
Context 4
... magneti- zation vector m = (m ξ , m η , m ζ ), whose ratio is approximately γ e /γ n 10 3 , the main contribution to the observed ac magne- tization comes from the oscillations of vector M. We can find needed relations using relation between the complex ampli- tudes of M ξ (t) and m ξ (t), as given by Eq. (A.7-A.9) in the Appendix. According to Fig. 3 and Eqs. (20-22), the vector component of electron magnetization M (t) h(t), which defines the ob- served NMR signals, can be expressed in terms of M ξ (t) ...

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