Magnetophotonic crystals (MPCs) comprising cerium-substituted yttrium iron garnet (CeYIG) sandwiched by two Bragg mirrors were fabricated by vacuum annealing. CeYIG was deposited on Bragg mirrors at room temperature and annealed in 5 Pa of residual air. No ceria or other non-garnet phases were detected. Cerium 3 + ions substituted on the yttrium sites and no cerium 4 + ions were found. The Faraday rotation angle of the MPC was -2.92° at a wavelength of λ = 1570 nm was 30 times larger than that of the CeYIG film. These results showed good agreement with calculated values derived using a matrix approach.

We demonstrate a logic gate based on interference of forward volume spin waves (FVSWs) propagating in a 54 nm thick, 100 μm wide yttrium iron garnet waveguide grown epitaxially on a garnet substrate. Two FVSWs injected by coplanar waveguides were made to interfere constructively and destructively by varying their phase difference, showing an XNOR logic function. The reflected and resonant waves generated at the edges of the waveguide were suppressed using spin wave absorbers. The observed isolation ratio was 19 dB for a magnetic field of ~2.80 kOe ( = 223 kA m−1) applied perpendicular to the film. The wavelength and device length were ~8.9 μm and ~53 μm, respectively. Further, the interference state of the SWs was analyzed using three-dimensional radio frequency simulations.

sections. Yttrium iron garnet (YIG) is extensively used for SW devices [11][12][13] because of its low intrinsic Gilbert damping, [14][15][16][17][18][19] but other materials with low Gilbert damping have been proposed, including Permalloy [20,21] and Heusler alloys. [22] However, films of low anisotropy materials such as YIG and Permalloy are typically magnetized in plane due to the dominant shape anisotropy and require a substantial external outof-plane magnetic field to saturate the film. This motivates the search for a magnetic material with a low Gilbert damping and a low out-of-plane saturation field, or ideally with a perpendicular magnetic anisotropy (PMA) that promotes an out-of-plane remanent magnetization, in order to realize integrated FV SW devices.The net magnetic anisotropy includes contributions from magnetocrystalline anisotropy, magnetoelastic anisotropy, and shape anisotropy. [9] In epitaxial films, magnetoelastic anisotropy can be tuned via the lattice mismatch with the substrate. Although YIG has only a modest magnetostriction, PMA was reported for 20 nm thick epitaxial YIG on a Sm 3 Ga 5 O 12 (SmGG) buffer layer on a rare-earth-substituted gadolinium gallium garnet (SGGG) substrate and for SGGG/SmGG/40 nm thick YIG/SmGG, [23] in which the top SmGG suppresses strain relaxation. The top SmGG was essential to obtain PMA in >40 nm thick YIG, but such overlayers lead to spacing loss which would decrease the efficiency of SW excitations using an antenna. Seed and buffer layers also lead to a more complex growth and patterning process. PMA has also been obtained in several single-layer rare-earth-substituted garnet films as a result of magnetoelastic anisotropy, [24][25][26][27] but the substitution of rare earth ions for Y in the iron garnet system tends to increase the Gilbert damping. [28,29] In these reports, there were no detailed discussions of the relation between the magnetoelastic anisotropy and the propagation properties of FV SWs.In this work, the effect of epitaxial mismatch on the net anisotropy and damping of YIG is described. By changing the magnetoelastic anisotropy, the field required for saturating the YIG out of plane can be reduced, facilitating the development of FV SW devices. Three epitaxial YIG films were prepared on gadolinium gallium garnet (GGG), SGGG, and neodymium gallium garnet (NGG) substrates directly (without any buffer layers). These substrates have the same crystalline structure but different lattice constants, yielding different lattice strain and Single-crystalline yttrium iron garnet (YIG) films are grown on gadolinium gallium garnet (GGG), rare-earth-substituted GGG, and neodymium gallium garnet (NGG) substrates, and their crystalline structures, surface morphologies, magnetic and magneto-optical properties, spin wave (SW) spectra of the forward volume (FV) mode, and damping parameters are characterized. YIG grown on NGG shows the smallest out-of-plane effective anisotropy field of 1080 Oe among the three samples because of its larger magnetoelastic anisotropy...

Thin film oxide materials often require thermal treatment at high temperature during their preparation, which can limit them from being integrated in a range of microelectronic or optical devices and applications. For instance, it has been a challenge to retain the optical properties of Bragg mirrors in optical systems at temperatures above 700 °C because of changes in the crystalline structure of the high–refractive-index component. In this study, a ~100 nm–thick amorphous film of tantalum oxide and yttrium oxide with an yttrium-to-tantalum atomic fraction of 14% was prepared by magnetron sputtering. The film demonstrated high resistance to annealing above 850 °C without degradation of its optical properties. The electronic and crystalline structures, stoichiometry, optical properties, and integration with magnetooptical materials are discussed. The film was incorporated into Bragg mirrors used with iron garnet microcavities, and it contributed to an order-of-magnitude enhancement of the magnetooptical figure of merit at near-infrared wavelengths.

In the above article, the values of the wavenumber and wavelength of the spin wave were incorrect (smaller and larger than correct values by 2p, respectively), therefore the spin-wave spectroscopy and the damping parameter calculated from the wavenumber and wavelength were also incorrect. As a result, five sentences, Figures 3 and 4, and Table 1 in the article should be amended as follows. In addition, the sign in Equation 8 was incorrect. This correction increased the difference between the two damping factors a SW and a FMR shown in new Figure 4b, but the reason is still unknown. The authors apologize for any inconvenience caused.A sentence in the Abstract should read: "YIG grown on NGG showed the smallest out-of-plane effective anisotropy field of 1080 Oe among the three samples because of its larger magnetoelastic anisotropy contribution and its damping parameter was 8.2 × 10 -4 ."A sentence in the final paragraph of Section 3.1 should read: "In this calculation, the measured θ CS and d were used, the value of k was taken as 0.70 mm -1 (wavelength λ SW = 8.92 mm), and the other parameters were set to the values used in the calculation of H A Stat ."A sentence in the final paragraph of Section 3.2 should read: "The damping parameters a SW at f = 4 GHz obtained from the attenuation length were 5.7 ×