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We show that a surface acoustic wave (SAW) applied across the terminals of amagnetic tunnel junction (MTJ) decreases both the (time-averaged) parallel andantiparallel resistances of the MTJ, with the latter decreasing much more thanthe former. This results in a decrease of the tunneling magnetoresistance (TMR)ratio. The coercivities of the free and fixed layer of the MTJ, however, arenot affected significantly, suggesting that the SAW does not cause large-anglemagnetization rotation in the magnetic layers through the inversemagnetostriction (Villari) effect at the power levels used. This study shedslight on the dynamical behavior of an MTJ under periodic compressive andtensile strain.

Surface Acoustic Wave induced modulation of tunneling magnetoresistance in magnetic tunnel junctions