Spin relaxation in multilayers with synthetic ferrimagnets
arXiv:1806.10911 · doi:10.1103/PhysRevB.98.144401
Abstract
We demonstrate a strong tunability of the spin-pumping contribution to magnetic damping in a thin-film ferromagnetic free layer interfaced with a synthetic ferrimagnet (SFM), acting as a spin-sink, via a thin Cu-spacer. The effect strongly depends on the magnetic state of the SFM, a trilayer structure composed of two Fe layers coupled via indirect exchange mediated by a Cr spacer. With increasing Cr thickness, the SFM state undergoes a transition from an antiparallel via a non-collinear to a parallel configuration. We can explain the corresponding non-monotonous dependence of spin relaxation in the free layer in terms of a modulation of the longitudinal spin transport as well as relaxation of the transverse angular momentum in the SFM. The results should be useful for designing high-speed spintronic devices where tunability of spin relaxation is advantageous.
arXiv comment8 pages, 6 figures
References in corpus (14)
- Antiferromagnetic spintronics
- Enhanced Gilbert Damping in Thin Ferromagnetic Films
- Nonlocal magnetization dynamics in ferromagnetic heterostructures
- Spin pumping and magnetization dynamics in metallic multilayers
- Spin-Diffusion Lengths in Metals and Alloys, and Spin-Flipping at Metal/Metal Interfaces: an Experimentalist's Critical Review
- Finite-element theory of transport in ferromagnet-normal metal systems
- Spin battery operated by ferromagnetic resonance
- Dynamic exchange coupling in magnetic bilayers
- Magnetization damping in noncollinear spin valves with antiferromagnetic interlayer couplings
- Enhancement of the Gilbert damping constant due to spin pumping in noncollinear ferromagnet/nonmagnet/ferromagnet trilayer systems
- Anisotropic magnetization relaxation in ferromagnetic multilayers with variable interlayer exchange coupling
- Dynamic exchange via spin currents in acoustic and optical modes of ferromagnetic resonance in spin-valve structures
- Thermally induced antiferromagnetic exchange in magnetic multilayers
- Thermal switching of indirect interlayer exchange in magnetic multilayers