Current controlled magnon propagation in Pt/Y3Fe_5O_(12) heterostructure

摘要

We present a dynamic modulation technique for spin wave using dc current by manipulating the mag-netic properties of an ultra-low damping Y3Fe5O12 thin film. Microwave excitation and detection technique with two coplanar waveguide antenna arrangement on Y3Fe5O12 surface was used to characterize the spin wave. An additional Pt stripe connected to dc current source was integrated between a pair of coplanar waveguides to demonstrate the spin wave resonance frequency and amplitude modulations by the current induction. We have used Pt stripe due to its significantly lower spin wave absorption property. dc current applied through the Pt stripe generates local joule heating that modifies magnetic properties of the Y3Fe5O12 film. Changing temperature due to local heating modify the saturated magnetization of the Y3Fe5O12 films, which interns modulates the spin wave frequency. Moreover, the amplitude of the spin wave spectra was found to be tuned by the dc currents amplitude. This phenomenon has been attributed to magnon-phonon scattering induced by relaxation rate enhancement in Y3Fe_5O_(12).