Abstract
A gyrator is a non-reciprocal two port device with 180° phase shift in the transmissions between two ports. Though electromagnetic realizations of gyrators have been well studied, devices based on other forms of interaction are relatively unexplored. Here we demonstrate a device in which signal is transmitted via magneto-elastic coupling, can function as a gyrator. The device is built on a piezoelectric substrate: one port of this device has interdigital transducers (IDTs) and the other port has a periodic array of nickel/gold lines. When the magnetizations of Ni lines are excited into precession by magnetic field generated by passing oscillating current through the gold lines, they emit phonons in the form of surface acoustic waves (SAW) due to the magneto-elastic coupling between Ni and substrate. The emitted SAW can be detected at the other end by the IDTs. Conversely, when SAW is incident on Ni lines from IDTs, the magnetization undergoes precession and can be inductively detected by Au lines. The broken time reversal symmetry of the system due to the presence of ferromagnet gives rise to the non-reciprocal transmission between the two ports. These devices could function as novel building blocks for phonon based information processing.
Highlights
Surface acoustic waves (SAW) can be efficiently generated in piezoelectric substrate with the help of interdigital transducer (IDT) structures
To ensure that the Ni films deposited are interacting with the surface waves, we first performed the acoustically driven ferromagnetic resonance (ADFMR) experiment, the results of which are shown in the supplementary material
The IDT design is same as used for the ADFMR experiment (λ~2 μm)
Summary
Surface acoustic waves (SAW) can be efficiently generated in piezoelectric substrate with the help of interdigital transducer (IDT) structures. Ferromagnetic resonance (FMR) excited by surface acoustic waves was demonstrated experimentally in Ni thin films by Weiler et al.[16, 17] and in GaMnAs dilute ferromagnetic semiconductor films by Thevenard et al.[18] recently. Ultrafast magnetization switching with SAW was demonstrated experimentally by Davis et al.[22] and its use for nanomagnetic logic operation was explored by Sampath et al.[23]. This new approach of magnetization switching with SAW is efficient in terms of power dissipation and could soon find potential technological applications
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