Abstract
We present a comparison of the spin wave propagation in Au/Y3Fe5O12 and Pt/Y3Fe5O12 bilayers. Microwave technique with a co-planner waveguide arrangement was used to excite and detect the spin wave. We observed a suppression in the propagating spin wave intensity when a metal stripe is placed on the surface of Y3Fe5O12 in the spin wave propagation path due to the spin pumping from Y3Fe5O12 to nonmagnetic metal stripe. However, a significant difference in the suppression property was observed with the Au and Pt electrode layers, which cannot be explained by the enhancement of the damping constant induced by spin pumping alone. The significant suppression of the spin wave propagation in the Au/Y3Fe5O12 bilayer system is attributed to the spin backflow and two magnon scattering.
Highlights
A collection of magnetic moments precessing around their equilibrium axes can propagate through a magnetic material in the form of waves, which are known as spin waves (SW)
Microwave probes from vector network analyzer (VNA) were connected to co-planner waveguides (CPWs)
The RF current in CPW creates an oersted field around its signal wire, which excites the SW in the magnonic material
Summary
A collection of magnetic moments precessing around their equilibrium axes can propagate through a magnetic material in the form of waves, which are known as spin waves (SW). The data processing application requires an active control or modulation of the SW by the external fields similar to the gating mechanism of a conventional electronic transistor. The necessity of a bulky laser arrangement and difficulty in confining the laser light restrict its application in on-chip device. Another approach has been reported to modulate the SW using electric current; it can eventually generate joule heating in the source inhibiting the advantage of SW. The coupling between the spin and the electric field is very weak, the electric field dependent phase modulation has been proposed.10,11 Another approach utilizes the electric field to produce mechanical effect such as piezoelectric effect.. This study was performed to select an appropriate combination of electrodes for SW modulating field
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