Structure, control, and dynamics of altermagnetic textures

Abstract

We present a phenomenological theory of altermagnets, that captures their unique magnetization dynamics and allows modelling magnetic textures in this new magnetic phase. Focusing on the prototypical d-wave altermagnets, e.g. RuO${}_2$, we can explain intuitively the characteristic lifted degeneracy of their magnon spectra, by the emergence of an effective sublattice-dependent anisotropic spin stiffness arising naturally from the phenomenological theory. We show that as a consequence the altermagnetic domain walls, in contrast to antiferromagnets, have a finite gradient of the magnetization, with its strength and gradient direction connected to the altermagnetic anisotropy, even for 180${}^{\circ }$ domain walls. This gradient generates a ponderomotive force in the domain wall in the presence of a strongly inhomogeneous external magnetic field, which may be achieved through magnetic force microscopy techniques. The motion of these altermagentic domain walls is also characterized by an anisotropic Walker breakdown, with much higher speed limits of propagation than ferromagnets but lower than antiferromagnets.

References in corpus (12)

• Broken Kramers' degeneracy in altermagnetic MnTe
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Phenomenology of Current-Induced Dynamics in Antiferromagnets
• Landau Theory of Altermagnetism
• Nonmagnetic Ground State in RuO${}_2$ Revealed by Muon Spin Rotation
• Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
• Fragility of the magnetic order in the prototypical altermagnet RuO${}_2$
• Altermagnetic anomalous Hall effect emerging from electronic correlations
• Spin pumping in an altermagnet/normal metal bilayer
• Observation of Giant Spin Splitting and d-wave Spin Texture in Room Temperature Altermagnet RuO2
• Altermagnetic Polar Metallic phase in Ultra-Thin Epitaxially-Strained RuO2 Films
• Spatial characterization of the magnetic field profile of a probe tip used in magnetic resonance force microscopy

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