Dynamical current-induced ferromagnetic and antiferromagnetic resonances

Abstract

We demonstrate that ferromagnetic and antiferromagnetic excitations can be triggered by the dynamical spin accumulations induced by the bulk and surface contributions of the spin Hall effect. Due to the spin-orbit interaction, a time-dependent spin density is generated by an oscillatory electric field applied parallel to the atomic planes of Fe/W(110) multilayers. For symmetric trilayers of Fe/W/Fe in which the Fe layers are ferromagnetically coupled, we demonstrate that only the collective out-of-phase precession mode is excited, while the uniform (in-phase) mode remains silent. When they are antiferromagnetically coupled, the oscillatory electric field sets the Fe magnetizations into elliptical precession motions with opposite angular velocities. The manipulation of different collective spin-wave dynamical modes through the engineering of the multilayers and their thicknesses may be used to develop ultrafast spintronics devices. Our work provides a general framework that probes the realistic responses of materials in the time or frequency domain.

5 pages, 4 figures

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• Direct electronic measurement of the spin Hall effect
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• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
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Cited by in corpus (8)

• Orbital magnetoelectric effect in zigzag nanoribbons of p-band systems
• Orbital magnetoelectric effect in nanoribbons of transition metal dichalcogenides
• Polarisation-dependent single-pulse ultrafast optical switching of an elementary ferromagnet
• Dynamical amplification of magnetoresistances and Hall currents up to the THz regime
• Comparative study of methodologies to compute the intrinsic Gilbert damping: interrelations, validity and physical consequences
• Spin-orbit torques and their associated effective fields from gigahertz to terahertz
• Controlling the orbital Hall effect in gapped bilayer graphene in the terahertz regime
• Engineering elliptical spin-excitations by complex anisotropy fields in Fe adatoms and dimers on Cu(111)