Current-controlled magnon propagation in Pt/Y3Fe5O12 heterostructure

Abstract

We present a dynamic spin wave (SW) modulation technique using direct current (DC) to manipulate the magnetic properties of an ultralow-damping Y3Fe5O12 thin film. The microwave excitation and detection technique with two coplanar waveguide antenna arrangements on the Y3Fe5O12 (YIG) surface is used to characterize the SW. An additional platinum (Pt) stripe connected to a current source is integrated between the coplanar waveguide pair to demonstrate the SW resonant frequency and amplitude modulation by current induction. We selected a Pt stripe due to its significantly lower spin wave absorption property. The application of current through the Pt stripe generates local joule heating that modifies the magnetic properties of the YIG film. Temperature variation through local heating modifies the saturation magnetization of the YIG film, which, in turn, modulates the SW frequency. Moreover, the amplitude of the SW spectra is found to be tuned by the current amplitude. This phenomenon is mainly described by magnon–magnon scattering induced by the spin Seebeck effect in the case of local heating. Furthermore, the group velocity of the proposed device is also found to be responsive to the current, which has been explained by both magnon–magnon and magnon-phonon scattering.

Realization of Multifunctional Bosonic Magnon Transistor via Thermal Phonon Gating

“…[ 17,54 ] The second is nonlinear magnon–magnon interactions, such as four magnon interactions, which changes the excited spin‐wave mode into undetectable modes. [ 20,23 ] In the case of large thermal phonon flow, we demonstrated that the nonequilibrium thermal magnon injection dominates the cut‐off of propagating spin‐wave. The injected thermal magnons interact nonlinearly with the transmission magnons as the thermal gradient increases, attenuating or even shutting down the transmission magnons flow.…”

“…[41] Second, we show that the proximity effect, spin pumping capability, and magnon-phonon scattering intensity from 0.34-nm-thick graphene can be ignored in our experiment and that the disturbance to spin-wave transmission is significantly less than that of other heavy metals like Pt. [20,33,36] As shown in Figure 1c, the amplitude part of S 21 collected from the VNA represents the spin-wave transmission properties (see Section 2.2. ), and monolayer graphene coating has almost no influence on the amplitude and frequency of spin waves.…”

“…The second approach uses Joule heat, which is controlled by electric current. [15,17,20] Heavy metals with high resistivity (such as platinum (Pt)) have been employed, which also means that the magnon-loss mechanisms including spin-pumping, [32,33] interface dynamic coupling, [34] and eddy current [35,36] are very strong, therefore, is not conducive to the transmission of spin waves, especially for surface waves with high wavenumbers. [37] In this work, we show a magnon transistor made with current-controlled thermal phonon gating.…”

“…Reconfigurable magnonics have developed rapidly in the past decade. Spin‐wave manipulation has been demonstrated in a variety of ways, including using electric, [ 8–10 ] Oersted, [ 11–13 ] or thermal [ 14–18 ] fields, or using electrons [ 19–22 ] or magnons [ 23 ] flow. Several investigations, for example, combine a thermal field or magnons flow [ 14,23 ] with Bragg scattering processes to reflect spin waves at precise frequencies and turn them off at specific wavelengths.…”

Electric‐Field Control of Propagating Spin Waves by Ferroelectric Domain‐Wall Motion in a Multiferroic Heterostructure

“…[ 1–5 ] Active control over spin waves in a magnetic material requires local variations of the effective magnetic field. Methods utilizing current‐driven Oersted fields, [ 6–9 ] electric fields and currents, [ 10–12 ] and laser‐induced heating [ 13–15 ] offer this essential functionality. Electric‐field manipulation of spin waves is particularly attractive because of its compatibility with on‐chip device integration and low‐power operation.…”