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Magneto-elastic (or "straintronic") switching has emerged as an extremelyenergy-efficient mechanism for switching the magnetization of magnetostrictivenanomagnets in magnetic memory, logic and non-Boolean circuits. Here, weinvestigate the ultrafast magneto-dynamics associated with straintronicswitching in a single quasi-elliptical magnetostrictive Co nanomagnet depositedon a piezoelectric PMN-PT substrate using time-resolved magneto-optical Kerreffect (TR-MOKE) measurements. The pulsed laser pump beam in the TR-MOKE playsa dual role: it causes precession of the nanomagnet's magnetization about anapplied bias magnetic field and it also generates surface acoustic waves (SAWs)in the piezoelectric substrate that produce periodic strains in themagnetostrictive nanomagnet and modulate the precessional dynamics. Thismodulation gives rise to intriguing hybrid magneto-dynamical modes in thenanomagnet, with rich spin wave texture. The characteristic frequencies ofthese modes are 5-15 GHz, indicating that strain can affect magnetization in amagnetostrictive nanomagnet in time scales much smaller than 1 ns (~100 ps).This can enable ~10 GHz-range magneto-elastic nano-oscillators that areactuated by strain instead of a spin-polarized current, as well as ultrafastmagneto-electric generation of spin waves for magnonic logic circuits,holograms, etc.

acs applied materials and interfaces

Hybrid magneto-dynamical modes in a single magnetostrictive nanomagnet  on a piezoelectric substrate arising from magneto-elastic modulation of  precessional dynamics