Domain Walls in Antiferromagnets with Strong Magnetoelastic Coupling

Author / Creator

MMM 2020 (2020)

Conferences

MMM 2020 G1: Antiferromagnetic Spintronics I (2020)

Available as

Online

Summary

Searching for the efficient manipulation of antiferromagnets for spintronic applications, we study the properties of the magnetic domain walls with due account of magnetoleastic effects. We show th...

Searching for the efficient manipulation of antiferromagnets for spintronic applications, we study the properties of the magnetic domain walls with due account of magnetoleastic effects. We show that magnetoelastic coupling induces anisotropy of the domain wall orientation which affects the shape and distribution of the domain walls in a sample. In case of non-1800 domains such anisotropy favours formation of the plane walls oriented along or perpendicular the hard magnetic axis. We study the pinning effects caused by magnetoelasticity and calculate the frequency of the localized oscillations and depinning field for an easy-plane antiferromagnet. We further consider dynamics of excitations of magnetoelastic domain wall and show that such a wall effectively scatters the long-wave magnons. The scattering and pinning effects are more pronounced in case of non-1800 domains, due to the strain-induced anisotropy inside domains. However, 1800 domain wall can also scatter the magnons due to the magnetoelastic strains inside the wall.To illustrate possible applications of our results we discuss the magnon propagation in multidomain hematite and NiO.

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