We address the theory of magnon-phonon interactions and compute the corresponding quasiparticle and transport lifetimes in magnetic insulators with focus on yttrium iron garnet at intermediate temperatures from anisotropy-and exchange-mediated magnon-phonon interactions, the latter being derived from the volume dependence of the Curie temperature. We find in general weak effects of phonon scattering on magnon transport and the Gilbert damping of the macrospin Kittel mode. The magnon transport lifetime differs from the quasi-particle lifetime at shorter wavelengths. arXiv:1906.01042v1 [cond-mat.str-el]
An analytical expression for the energy of Néel skyrmions in ultra-thin nanodots considering exchange, uniaxial anisotropy, Dzyaloshinskii-Moriya, and dipolar contributions has been obtained. In particular, we have proposed for the Néel skyrmion, a general ansatz for the component of the magnetization perpendicular to the dot, given by mz(r) = [1 − (r/Rs) n ]/[1 + (r/Rs) n ], where Rs is the radius of the skyrmion and n is an integer and even number. As proof of concept, we calculate the energy of a Néel skyrmion in an ultra-thin Co/Pt dot, and we find that the dipolar contribution cannot be neglected and that both Dzyaloshinskii-Moriya interaction and anisotropy play an important role to stabilize the skyrmion. Additionally, we have obtained a good agreement between our analytical calculations and previously published micromagnetic simulations for n = 10. For this reliable value of n, we have obtained that for a Dzyaloshinski Moriya constant D = 5.5 (mJ/m 2 ), it is possible to stabilize a Néel skyrmion for Ku in the range, 0.4 (M J/m 3 ) < Ku < 1.3 (M J/m 3 ), whereas for Ku = 0.8 (M J/m 3 ), the skyrmion stabilizes for 5.0 (mJ/m 2 ) < D < 6.0 (mJ/m 2 ). Thus, this analytical equation can be widely used to predict stability ranges for the Néel skyrmion in spintronic devices. arXiv:1705.03778v1 [cond-mat.mes-hall] 10 May 2017 2
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