Abstract
Abstract This paper presents a comprehensive study of antennas based on co-planar waveguides (CPW) for ferromagnetic resonance (FMR) detection and spin wave spectroscopy in ferromagnetic insulators. We studied the FMR detection waveguide for both flip-chip method and on-chip waveguide. An antenna can work with low-wave vectors on commercial substrates such as RO4003/Al2O3 and ferromagnetic insulators such as yttrium iron garnet. A higher value of wave vector k is required by antennas to excite spin wave with a shorter wavelength, which strongly depends on the width of the antenna. A co-plane waveguide antenna can excite k1 between 0 and 6 rad/μm with the spin wave group velocity and excitation-spectrum width Δk = 3.58 rad/μm and inner signal line 0.5 μm. The value of k1 for antenna excited spin wave using a 0.5 μm short-circuit line of CPW varied between 0 and 7 rad/μm with Δk = 1.98 rad/μm. Antennas with different width (0.5–10 μm) were also studied. Meander-shaped short-circuit lines were designed to modify the k vector. The maximum amplitude of the k vector of the designed antenna appeared at k3 ≈ 3 rad/μm for the line width of 0.5 μm.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call