Abstract
We study the potential of all-electrical inductive techniques for the spectroscopy of propagating forward volume spin waves. We develop a one-dimensional model to account for the electrical signature of spin-wave reflection and transmission between inductive antennas and validate it with experiments on a perpendicularly magnetized Co/Ni multilayer. We describe the influence of the antenna geometry and antenna-to-antenna separation, as well as that of the material parameters on the lineshape of the inductive signals. For a finite damping, the broadband character of the antenna emission in the wave vector space imposes to take into account the growing decoherence of the magnetization waves upon their spatial propagation. The transmission signal can be viewed as resulting from two contributions: a first one from propagating spin-waves leading to an oscillatory phase of the broadband transmission coefficient, and another one originating from the distant induction of ferromagnetic resonance because of the long-range stray fields of realistic antennas. Depending on the relative importance of these two contributions, the decay of the transmitted signal with the propagation distance may not be exponential and the oscillatory character of the spin-wave phase upon propagation may be hidden. Our model and its experimental validation allow to define geometrical and material specifications to be met to enable the use of forward volume spin waves as efficient information carriers.
Highlights
The eigenexcitations of magnetic materials—the spin waves (SWs) [1,2]—are attractive for future wave-basedcomputing applications [1,3,4,5] because they combine easyto-tune wavelengths from the macroscopic scale to the submicron scale, GHz frequencies, and tunability [6,7,8]
We study the potential of all-electrical inductive techniques for the spectroscopy of propagating forward volume spin waves
We describe the influence of the antenna geometry and antenna-to-antenna separation, as well as that of the material parameters on the line shape of the inductive signals
Summary
The eigenexcitations of magnetic materials—the spin waves (SWs) [1,2]—are attractive for future wave-basedcomputing applications [1,3,4,5] because they combine easyto-tune wavelengths from the macroscopic scale to the submicron scale, GHz frequencies, and tunability [6,7,8]. The most popular configuration is the Damon-Eshbach (DE) one, where M ⊥ k; these waves can be efficiently generated by standard inductive or rf-spin-orbit-torque (SOT) techniques [10,11] Beside, they possess large group velocities and can propagate over long distances before being attenuated. To enable spin-wave-based transmission of information in any arbitrary direction, one can rather harness isotropic spin waves like the forward volume spin waves [15] (FVSW), whose wave vector lies in the plane of a film magnetized in the out-of-plane direction. Such waves with isotropic propagation recently enabled logic operations [5]. Our findings promise to be insightful for the edition of the geometrical and material specifications to be met to enable the use of FVSW as efficient information carriers
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