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Published Online: 13 August 2018
Accepted: July 2018

Excitation and coherent control of magnetization dynamics in magnetic tunnel junctions using acoustic pulses

Appl. Phys. Lett. 113, 072403 (2018); https://doi.org/10.1063/1.5037780
H. F. Yang1, F. Garcia-Sanchez1,2, X. K. Hu1, S. Sievers1, T. Böhnert3, J. D. Costa3,a), M. Tarequzzaman3, R. Ferreira3, M. Bieler1,b), and H. W. Schumacher1
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Abstract
We experimentally study magnetization dynamics in magnetic tunnel junctions driven by femtosecond-laser-induced surface acoustic waves. The acoustic pulses induce a magnetization precession in the free layer of the magnetic tunnel junction through magnetoelastic coupling. The frequency and amplitude of the precession show a pronounced dependence on the applied magnetic field and the laser excitation position. Comparing the acoustic-wave-induced precession frequencies with precession induced by charge currents and with micromagnetic simulations, we identify spatially non-uniform magnetization modes localized close to the edge regions as being responsible for the optically induced magnetization dynamics. The experimental scheme even allows us to coherently control the magnetization precession using two acoustic pulses. This might prove important for future applications requiring ultrafast spin manipulation. Additionally, our results directly pinpoint the importance of acoustic pulses since they could be relevant when investigating optically induced temperature effects in magnetic structures.

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