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Magnetic properties of the magnetophotonic crystal based on bismuth iron garnet
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10.1063/1.4764345
/content/aip/journal/jap/112/9/10.1063/1.4764345
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/9/10.1063/1.4764345
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Summary of the Bi/Fe ratio dependences on oxygen pressure for the films grown by pulsed laser deposition at around 800 K by different research groups.10,14,15,17,18 The vertical dashed lines delimit the region where garnet phase was observed. The horizontal dashed line corresponds to stoichiometric Bi/Fe ratio. Two black points mark the conditions where no BIG phase was detected. The inset shows Bi/Fe ratio transfer from a target to a film adapted from Refs. 17 and 19. The dashed lines represent stoichiometric Bi/Fe.

Image of FIG. 2.
FIG. 2.

Micromagnetic simulations for two parts of MPC based on BIG: C-MPC (array of holes with 6-fold symmetry) and G-MPC (a raw of missing holes). Normalized out-of-plane magnetization MZ is shown as a function of the applied perpendicular field HZ for C-MPC, G-MPC and Stoner-Wohlfarth uniform rotation model in the absence of perpendicular anisotropy. The inset shows magnetic moment configurations in HZ = 0 G for C-and G-MPC. The arrows represent the orientation and the absolute value of the magnetic moments in OXY plane. MZ/MS = 0.

Image of FIG. 3.
FIG. 3.

Micromagnetic simulations for two parts of MPC based on BIG in the presence of moderate perpendicular anisotropy. Normalized out-of-plane magnetization MZ is shown as a function of the applied perpendicular field HZ for C-MPC, G-MPC and Stoner-Wohlfarth uniform rotation model. Theinset represents magnetic moment distribution in HZ = 0 G at NZ = 17 for C- and G-MPC. The arrows represent the orientation and the absolute value of the magnetic moments in OXY plane. MZ/MS = 0.059.

Image of FIG. 4.
FIG. 4.

Magnetization distribution at NZ = 17 in OXY plane for the case of moderate perpendicular anisotropy: (a) before the first transition, at HZ = 390 G (MZ/MS = 0.553) and (b) immediately after the transition, at HZ = 400 G (MZ/MS = 0.691). The arrows represent the orientation and the absolute value of the magnetic moments in OXY plane. Red and blue colors indicate the presence of the out-of-plane magnetization component: MZ > 0 and MZ < 0, respectively.

Image of FIG. 5.
FIG. 5.

Partial XRD scans for the samples prepared on GGG(001) substrates at different oxygen pressures. The substrate temperature is 920 K. The observed unindexed peaks correspond to Bi2Fe4O9, BiFeO3 and a bismuth oxide phase slightly doped with iron.

Image of FIG. 6.
FIG. 6.

Lattice parameter of the films prepared at different oxygen pressures on GGG and SGGG substrates. The substrate temperature was kept at 920 K. The inset shows the dependence of the lattice parameter on substrate temperature at PO2 = 4 × 10−2 Torr for both types of substrate. The dashed line represents theoretically estimated BIG parameter.

Image of FIG. 7.
FIG. 7.

Root-mean-square roughness of BIG/GGG(001) and BIG/SGGG(001) films prepared at different oxygen pressure and TS = 920 K. Inset shows roughness as a function of TS at PO2 = 4 × 10−2 Torr for BIG/SGGG(001) series.

Image of FIG. 8.
FIG. 8.

MO spectra for the BIG/GGG(001) films prepared at different oxygen pressure and TS = 920 K. The insets show the Faraday rotation angle ratios for BIG/GGG(001) and BIG/SGGG(001) films grown at different oxygen pressure and substrate temperature.

Image of FIG. 9.
FIG. 9.

Normalized Faraday rotation angle as the function of the magnetic field applied perpendicularly to the film plane. Both samples, BIG/GGG(001) and BIG/GGG(111), were grown at PO2 = 4 × 10−2 Torr and TS = 920 K.

Image of FIG. 10.
FIG. 10.

Faraday rotation angle as the function of the magnetic field applied perpendicularly to the film plane for a continuous and a nanostructured BIG(001) film (PO2 = 4 × 10−2 Torr and TS = 920 K). Inset represents a SEM image of the nanostructured film. White line on SEM image corresponds to the length of 1 μm.

Image of FIG. 11.
FIG. 11.

Resonance field as a function of the out-of-plane angle between the sample and the applied magnetic field for a continuous and nanostructured BIG(001) film (PO2 = 4 × 10−2 Torr and TS = 920 K). The continuous lines represent the fit with the formula described in the text. The inset shows the geometry used for FMR measurements. H is applied field vector and M magnetization vector. θH,MH,M) are the out-of-plane (in-plane) angles of the applied magnetic field and magnetization respectively.

Image of FIG. 12.
FIG. 12.

Resonance field as a function of the in-plane angle between the [001] axis of the film and the applied magnetic field for a continuous and nanostructured BIG(001) film (PO2 = 4 × 10−2 Torr and TS = 920 K). The continuous lines represent the fit with the 4-fold symmetry function (Ref MPC) and the superposition of 4-fold and 6-fold symmetry functions (C-MPC).

Image of FIG. 13.
FIG. 13.

Faraday rotation and ellipticity as functions of decreasing and increasing perpendicular applied field. The short continuous arrows show the field direction. The long vertical arrows indicate the maxima in ellipticity signal corresponding to coercive field.

Image of FIG. 14.
FIG. 14.

AFM (a), (c) and MFM (b), (d) images taken on continuous (a), (b) and nanostructured (c), (d) BIG(001) film (PO2 = 4 × 10−2 Torr and TS = 920 K). The image in-plane sizes are 5 μm × 10 μm. The vertical scale is shown for each image on the right side. The continuous lines represent the place on the images where the sections from Fig. 15 were taken.

Image of FIG. 15.
FIG. 15.

Section of the AFM and MFM images for (a) a continuous and (b) a nanostructured film (PO2 = 4 × 10−2 Torr and TS = 920 K). Dashed-dotted lines show topology periods (borders between holes) and dashed lines are centered on the maxima of magnetic image (walls of the holes).

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/content/aip/journal/jap/112/9/10.1063/1.4764345
2012-11-05
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic properties of the magnetophotonic crystal based on bismuth iron garnet
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/9/10.1063/1.4764345
10.1063/1.4764345
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