Excitation and detection of short-waved spin waves in ultrathin Ta/CoFeB/MgO-layer system suitable for spin-orbit-torque magnonics

Abstract

We report on the excitation and detection of short-waved spin waves with wave vectors up to about $40\mathrm{rad}\mu {\mathrm{m}}^{-1}$ in spin-wave waveguides made from ultrathin, in-plane magnetized Co${}_8$Fe${}_{72}$B${}_{20}$ (CoFeB). The CoFeB is incorporated in a layer stack of Ta/CoFeB/Mgo, a layer system featuring large spin orbit torques and a large perpendicular magnetic anisotropy constant. The short-waved spin waves are excited by nanometric coplanar waveguides and are detected via spin rectification and microfocussed Brillouin light scattering spectroscopy. We show that the large perpendicular magnetic anisotropy benefits the spin-wave lifetime greatly, resulting in a lifetime comparable to bulk systems without interfacial damping. The presented results pave the way for the successful extension of magnonics to ultrathin asymmetric layer stacks featuring large spin orbit torques.

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Cited by in corpus (11)

• Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films
• Non-Hermitian coherent coupling of nanomagnets by exchange spin waves
• Enhanced magnon spin transport in NiFe${}_2$O${}_4$ thin films on a lattice-matched substrate
• Backward volume vs Damon-Eshbach: a travelling spin wave spectroscopy comparison
• Microscopic Theory of Ultrafast Skyrmion Excitation by Light
• Fundamentals of magnon-based computing
• Spin Wave Interference Detection via Inverse Spin Hall Effect
• Nanoscale spin-wave wake-up receiver
• Femtosecond laser comb driven perpendicular standing spin waves
• Current induced multi-mode propagating spin waves in a spin transfer torque nano-contact with strong perpendicular magnetic anisotropy
• Characterization of Spin-Transfer-Torque effect induced magnetization dynamics driven by short current pulses