Voltage-control of damping constant in magnetic-insulator/topological-insulator bilayers
arXiv:2106.03332 · doi:10.1063/5.0046217
Abstract
The magnetic damping constant is a critical parameter for magnetization dynamics and the efficiency of memory devices and magnon transport. Therefore, its manipulation by electric fields is crucial in spintronics. Here, we theoretically demonstrate the voltage-control of magnetic damping in ferro- and ferrimagnetic-insulator (FI)/topological-insulator (TI) bilayers. Assuming a capacitor-like setup, we formulate an effective dissipation torque induced by spin-charge pumping at the FI/TI interface as a function of an applied voltage. By using realistic material parameters, we find that the effective damping for a FI with 10nm thickness can be tuned by one order of magnitude under the voltage with 0.25V. Also, we provide perspectives on the voltage-induced modulation of the magnon spin transport on proximity-coupled FIs.
6 pages, 3 figures. Accepted to Applied Physics Letters
References in corpus (16)
- Spin Transfer Torques
- Surface Magnetoelectric Effect in Ferromagnetic Metal Films
- Recent progress in voltage control of magnetism: Materials, mechanisms, and performance
- Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator
- Surface state dominated spin-charge current conversion in topological insulator/ferromagnetic insulator heterostructures
- Electronic control of the spin-wave damping in a magnetic insulator
- Large-gap magnetic topological heterostructure formed by subsurface incorporation of a ferromagnetic layer
- Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators
- Crossover from quantum to Boltzmann transport in graphene
- Spin and Orbital Magnetic Response on the Surface of a Topological Insulator
- Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator
- Crystal field effects on spin pumping
- Voltage control of interface rare-earth magnetic moments
- Electrically induced strong modulation of magnons transport in ultrathin magnetic insulator films
- Electrical control of spin mixing conductance in a YFeO/Platinum bilayer
- Voltage-driven Magnetization Switching via Dirac Magnetic Anisotropy and Spin--orbit Torque in Topological-insulator-based Magnetic Heterostructures