Investigation on two magnon scattering processes in pulsed laser deposited epitaxial nickel zinc ferrite thin film

Spin-Current Generation in Low-Damping Ni0.65Zn0.35Al0.8Gray1, Emori2, Gray3 et al. 2018Phys. Rev. Applied24150View full textAdd to dashboardCite

“…This coherent epitaxial strain leads to unusually large easy-plane magnetic anisotropy, which is beneficial for attaining FMR with a low bias magnetic field. More importantly, the coherent epitaxy eliminates misfit dislocations, which are sources of defect-mediated damping that is typically present in conventional spinel ferrite films [25,26]. We also note that the NZAFO film surface is very smooth, with typical roughness deduced by atomic force microscopy and X-ray reflectivity of 1-2 Å, much smaller than the spinel lattice parameter.…”

“…We have developed highly crystalline, fully strained Ni 0.65 Zn 0.35 Al 0.8 Fe 1.2 O 4 (NZAFO) thins films. The very low defect density in these films is critical to the observed low damping behavior and distinguishes them from typical spinel ferrite thin films [25,26]. X-ray diffraction indicates high quality growth of NZAFO on (001) oriented MgAl 2 O 4 (MAO) substrates (a = 8.083 Å) with evidence for only the (00l) family of peaks in the symmetric θ−2θ scan, strong Laue oscillations indicating smooth interfaces, and a full width at half maximum rocking curve linewidth ω < 0.03° (figure 1a,b).…”

Ultralow Damping in Nanometer-Thick Epitaxial Spinel Ferrite Thin Films

“…In addition to the linear frequency dependence of ΔH hwhm , the damping in coherently strained MAFO films is essentially isotropic in the film plane (Figure 3b), and a similar value of α is obtained with field applied out of plane (see the Supporting Information). These results suggest that two-magnon scattering 37 contributes negligibly to the damping. The low damping parameter of MAFO is approximately half that of NiZnAl-ferrite thin films 24 and lower than the α ≈ 0.0021 of bulk single-crystal spinel-structure Li 0.5 Fe 2.5 O 4 .…”

Dynamical magnetic behavior of anisotropic spinel-structured ferrite for GHz technologies

“…This results in a defect-mediated damping 37 . These factors are potentials for “extrinsic” damping, which leads to high value 43 − 48 . However, from microstructural investigations in this study, we observed neither remarkable antiphase boundaries nor misfit dislocations (Fig.…”