Spin pumping in an altermagnet/normal metal bilayer

Abstract

Altermagnetism is a subclass of antiferromagnetism that features spin-polarized electron bands of a non-relativistic origin despite the absence of a net magnetiation in the material. We here theoretically study spin pumping from an altermagnetic insulator into a normal metal. The symmetry properties of the lattice and spin order of the altermagnet alters the magnon dispersion compared to a conventional square lattice antiferromagnet. We find that for a homogeneous magnetic field, the spin pumping current is the same as that of a regular antiferromagnet. If, however the magnetic field becomes spatially dependent, we predict that the altermagnetic order leaves a unique fingerprint on the spin pumping behaviour when the orientation of the spatial modulation does not align with the high-symmetry paths of magnon degeneracy in the altermagnet. This demonstrates that altermagnets can be used for THz spin pumping purposes with novel behaviour, distinguishing them from their regular antiferromagnet counterparts.

14 pages, 5 figures

References in corpus (6)

• Spin pumping and spin-transfer torques in antiferromagnets
• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
• Spin pumping and shot noise in ferrimagnets: bridging ferro- and antiferromagnets
• Microscopic theory of spin transport at the interface between the superconductor and a ferromagnetic insulator
• Spin-pumping in superconductor-antiferromagnetic insulator bilayers

Cited by in corpus (20)

• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Mirror Chern Bands and Weyl Nodal Loops in Altermagnets
• Superconducting phenomena in systems with unconventional magnets
• Structure, control, and dynamics of altermagnetic textures
• Elasto-Hall conductivity and the anomalous Hall effect in altermagnets
• Nonlinear Superconducting Magnetoelectric Effect
• Interface-induced magnetization in altermagnets and antiferromagnets
• Transverse Spin current at the normal/p-wave magnet junctions
• Interplay between altermagnetism and topological superconductivity on an unconventional superconducting platform
• Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
• Conditions for orbital selective altermagnetism in Sr${}_2$RuO${}_4$: tight binding model, similarities with cuprates and implications on superconductivity
• Giant spatial anisotropy of magnon lifetime in altermagnets
• Epitaxial growth and transport properties of a metallic altermagnet CrSb on a GaAs (001) substrate
• Elastic Quantum Criticality in Nematics and Altermagnets via the Elasto-Caloric Effect
• Multipole analysis of spin currents in altermagnetic MnTe
• Tailoring Corner States and Exceptional Points in Altermagnets
• Altermagnetism from the viewpoint of chemistry
• Spin-Orbit Coupling-Driven Chirality Switching of Spin Waves in Altermagnets
• Phonon-enhanced optical spin-conductivity and spin-splitter effect in altermagnets
• Josephson effects in the spin-triplet superconductor/altermagnet/spin-triplet superconductor junctions: the detection of the intrinsic $\mathbf{d}$-vector