Ultra-low damping insulating magnetic thin films get perpendicular

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 Y${}_3$Fe${}_5$O${}_{12}$ (BiYIG) films on Gd${}_3$Ga${}_5$O${}_{12}$ (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${}^{\prime }$s surface is transparent to spin current making it appealing for spintronic applications.

arXiv comment17 pages, 4 figures and 8 pages of Supp. informations

References in corpus (8)

• Spin Caloritronics
• Magnonic crystals for data processing
• Generation of coherent spin-wave modes in Yttrium Iron Garnet microdiscs by spin-orbit torque
• Electronic control of the spin-wave damping in a magnetic insulator
• Anomalous Hall hysteresis in Tm3Fe5O12/Pt with strain-induced perpendicular magnetic anisotropy
• Spin caloritronic nano-oscillator
• Snell's Law for Spin Waves
• Spin wave excitation in magnetic insulators by spin-transfer torque

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