Abstract
A magnetic material combining low losses and large perpendicular magnetic anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields. We report here on the growth of ultrathin Bismuth doped Y3Fe5O12 (BiYIG) films on Gd3Ga5O12 (GGG) and substituted GGG (sGGG) (111) oriented substrates. A fine tuning of the PMA is obtained using both epitaxial strain and growth-induced anisotropies. Both spontaneously in-plane and out-of-plane magnetized thin films can be elaborated. Ferromagnetic Resonance (FMR) measurements demonstrate the high-dynamic quality of these BiYIG ultrathin films; PMA films with Gilbert damping values as low as 3 × 10−4 and FMR linewidth of 0.3 mT at 8 GHz are achieved even for films that do not exceed 30 nm in thickness. Moreover, we measure inverse spin hall effect (ISHE) on Pt/BiYIG stacks showing that the magnetic insulator’s surface is transparent to spin current, making it appealing for spintronic applications.
Highlights
A magnetic material combining low losses and large perpendicular magnetic anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields
We report here on the Pulsed Laser Deposition (PLD) growth of ultra-low loss magnetic insulators (MI) nanometers-thick films with large PMA: Bi substituted Yttrium Iron Garnet (BixY3-xFe5O12 or BiYIG) where tunability of the PMA is achieved through epitaxial strain and Bi doping level
The two substrates that are used are gallium gadolinium garnet (GGG), which is best lattice matched to pristine YIG and substituted GGG which is traditionally used to accommodate substituted YIG films for photonics applications
Summary
A magnetic material combining low losses and large perpendicular magnetic anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields. The peak-to-peak FMR linewidth (that characterize the losses) can be as low as μ0ΔHpp = 0.3 mT at 8 GHz for 30 nm thick films This material opens new perspectives for both spintronics and magnonics fields as the SW dispersion relation can be tuned through magnetic anisotropy without the need of a large bias magnetic field. Ultra-thin MI films showing PMA have been the subject of an increasing interest: Tm3Fe5O12 or BaFe12O19 (respectively a garnet and an hexaferrite) have been used to demonstrate spin-orbit-torque magnetization reversal using a Pt over-layer as a source of spin current4,17,18 Their large magnetic losses prohibit their use as a spin-wave medium (reported value of μ0ΔHpp of TIG is 16.7 mT at 9.5 GHz).
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