Abstract
Utilization of pure spin currents not accompanied by the flow of electrical charge provides unprecedented opportunities for the emerging technologies based on the electron's spin degree of freedom, such as spintronics and magnonics. It was recently shown that pure spin currents can be used to excite coherent magnetization dynamics in magnetic nanostructures. However, because of the intrinsic nonlinear self-localization effects, magnetic auto-oscillations in the demonstrated devices were spatially confined, preventing their applications as sources of propagating spin waves in magnonic circuits using these waves as signal carriers. Here, we experimentally demonstrate efficient excitation and directional propagation of coherent spin waves generated by pure spin current. We show that this can be achieved by using the nonlocal spin injection mechanism, which enables flexible design of magnetic nanosystems and allows one to efficiently control their dynamic characteristics.
Highlights
Utilization of pure spin currents not accompanied by the flow of electrical charge provides unprecedented opportunities for the emerging technologies based on the electron’s spin degree of freedom, such as spintronics and magnonics
The possibility to control magnetization dynamics by pure spin currents is especially attractive for magnonics[19,20,21,22,23], which uses propagating spin waves as the nanoscale signal carrier
For positive driving electric currents, as defined by red arrows in Fig. 1a,b, the magnetic moment carried by the spin current is antiparallel to the magnetization of the Py layer, resulting in the spin torque effect (STT) compensating the dynamic magnetic damping
Summary
Utilization of pure spin currents not accompanied by the flow of electrical charge provides unprecedented opportunities for the emerging technologies based on the electron’s spin degree of freedom, such as spintronics and magnonics. We experimentally demonstrate efficient excitation and directional propagation of coherent spin waves generated by pure spin current We show that this can be achieved by using the nonlocal spin injection mechanism, which enables flexible design of magnetic nanosystems and allows one to efficiently control their dynamic characteristics. The lack of the requirement for the electrical current flow through the active magnetic layers results in a unique flexibility compatible with a variety of novel magnetic nanooscillator geometries including nanowires[12], nanoconstrictions[11], nanogaps[7,9,10,13,14,16,17] and nanocontacts[15] This flexibility enables straightforward adaptation of devices operated by spin current to the needs of specific applications and their incorporation as building blocks in integrated electronic circuits. The demonstrated system exhibits efficient and controllable excitation and directional propagation of coherent spin waves characterized by a large decay length
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