Giant nonreciprocal emission of spin waves in Ta/Py bilayers

Abstract

Spin waves are propagating disturbances in the magnetization of magnetic materials. One of their interesting properties is the nonreciprocity, exhibiting that their amplitude depends on the magnetization direction. Nonreciprocity in spin waves is of great interest in both fundamental science and applications, as it offers an extra knob to control the flow of waves for the technological fields of logics and switch applications. We show a high nonreciprocity in spin waves from Ta/Py bilayer systems with out-of-plane magnetic fields. The nonreciprocity depends on the thickness of Ta underlayer which is found to induce an interfacial anisotropy. The origin of observed high nonreciprocity is twofold; different polarities of the in-plane magnetization due to different angles of canted out-of-plane anisotropy and the spin pumping effect at the Ta/Py interface. Our findings provide an opportunity to engineer highly efficient nonreciprocal spin wave based applications such as nonreciprocal microwave devices, magnonic logic gates, and information transports.

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Cited by in corpus (16)

• Magnetic texture based magnonics
• Excitation of unidirectional exchange spin waves by a nanoscale magnetic grating
• Nonreciprocal magnons and symmetry-breaking in the noncentrosymmetric antiferromagnet
• Chiral excitation of spin waves in ferromagnetic films
• Nonreciprocity of spin waves in noncollinear magnets due to the Dzyaloshinskii-Moriya interaction
• Non-Hermitian coherent coupling of nanomagnets by exchange spin waves
• Spin-wave propagation in cubic anisotropic materials
• Emerging spintronics phenomena and applications
• Spin-wave propagation in the presence of inhomogeneous Dzyaloshinskii-Moriya interactions
• Effect of inhomogeneous Dzyaloshinskii-Moriya interaction on antiferromagnetic spin-wave propagation
• Theory of nonreciprocal spin waves excitation in spin-Hall oscillators with Dzyaloshinkii-Moriya interaction
• Unidirectional spin waves measured using propagating spin wave spectroscopy
• Writing and storing information in an array of magnetic vortex nanodisks using their azimuthal modes
• Nonreciprocal Spin Waves Driven by Left-Hand Microwaves
• Shock-wave-like emission of spin waves induced by interfacial Dzyaloshinskii-Moriya interaction
• Effects of the removal of Ta capping layer on the magnetization dynamics of Permalloy thin films