Characterization of epitaxial (Y,Bi)3(Fe,Ga)5O12 thin films grown by metal-organic decomposition method

Ishibashi, Takayuki; Mizusawa, A.; Nagai, Masataka; Shimizu, Shinichiro; Sato, K.; Togashi, Naoto; Mogi, Takayuki; Houchido, Michio; Sano, Hiroaki; Kuriyama, K.

doi:10.1063/1.1827339

Cited by 71 publications

(43 citation statements)

References 12 publications

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“…We have reported that metal-organic decomposition ( MOD) method is promising to obtain high quality garnet films with high-bismuth content because they are advantageous not only for homogeneity of the thin film, the controllability of composition, and formation over large area but also for the good productivity and stability of the MOD solution for more than several years [11][12][13][14][15][16] . In previous work, we have also reported that Nd 2 BiFe 4 GaO 12 (Bi1:NIGG) layer is effective as a buffer layer to obtain Y 2 Bi 2.5 Fe 5 O 12 , x = 2.5, on glass substrates 15 .…”

Section: Introductionmentioning

confidence: 99%

Nd_3-xBi_xFe₄GaO₁₂(x = 2, 2.5) films on glass substrates prepared by MOD method

Yoshida

Oishi

Nishi

et al. 2014

EPJ Web of Conferences

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Abstract. We studied Nd 3-X Bi X Fe 4 GaO 12 films to obtain perpendicular magnetic anisotropy as well as large Faraday effect. NdBi 2 Fe 4 GaO 12 (Bi2:NIGG) and Nd 0.5 Bi 2.5 Fe 4 GaO 12 (Bi2.5:NIGG) films were obtained on Nd 2 BiFe 4 GaO 12 (Bi1:NIGG) layer prepared on glass substrates by metal-organic decomposition (MOD) method. Bi2:NIGG and Bi2.5:NIGG films showed large Faraday rotation angles of 7.5 and 10.5 degree/μm, at a wavelength of 520 nm, respectively. Those films have perpendicular magnetic anisotropy with a coercivity of 350 Oe and a saturation magnetic field of 730 Oe.

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Section: Introductionmentioning

confidence: 99%

Nd_3-xBi_xFe₄GaO₁₂(x = 2, 2.5) films on glass substrates prepared by MOD method

Yoshida

Oishi

Nishi

et al. 2014

EPJ Web of Conferences

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“…We are optimistic to improve the frame rate to the video-rate by appropriate selection of a fast response LCM. 4 …”

Section: 1 H H Ys Teresis Mea Surementsmentioning

confidence: 99%

“…Those images are captured with a delay time of 200 ms after each voltage corresponding to LCP, LP and RCP, and are immediately transferred to the memory on the computer. MO images for rotation and ellipticity are constructed with MO values obtained for each pixel by using equation (3) and (4). In this experiment, although the delay time of 200 ms was required to measure images, we consider that the delay time will be shortened as small as 10 ms by using other fast response LCM devices.…”

Section: Introductionmentioning

confidence: 99%

Real Time Magneto-optical Imaging using Liquid Crystal Modulator

et al. 2006

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Polarization modulation technique has been applied for magneto-optical (MO) imaging to measure MO values quantitatively. In this paper, we report on a real-time MO imaging using the polarization modulation method with a liquid crystal modulator. Measurements of MO images and hysteresis Kerr loop of patterned Bi,Ga substituted yttrium iron garnet film were demonstrated by using the technique. A frame rate of 1 s was achieved in this experiment. K Key wor ds : magneto-optical imaging, garnet thin film, real time measurement, liquid crystal modulator 1 1. I ntro duction Recent years, quantitative and real time measurements are one of the most important issues in the magneto-optical (MO) imaging to study dynamics of magnetic properties in magnetic materials. We have recently developed an MO microscope using a polarization modulation technique, and demonstrated that quantitative MO measurements are possible with this technique [1][2][3] .In this technique, quantitative images of MO rotation and ellipticity can be obtained by using three images taken with three different polarized lights; i.e., the linearly polarized light (LP), the right-circularly polarized light (RCP) and the left-circularly polarized light (LCP). However, there is a drawback that it takes a several seconds at least for measurements because of a procedure to modulate optical polarization states by mechanical rotation of a quarter wave plate. In order to realize a real time MO imaging at the video rate (30 frames/sec) using this technique, an optical modulator that works faster than 30 ms is required. In this study, we used a liquid crystal modulator (LCM), which can switch the optical polarization state only by changing an AC voltage applied to the device. In this paper, we report on introduction of LCM to the MO microscope and MO imaging for a patterned Bi,Ga-substituted yttrium iron garnet (YBFGO) thin film 4) . 2 2. M MO microscope Figure 1 shows an optical setup for the MO microscope used in this experiment. In order to utilize the optical modulation method with a polarizer, an LCM and an analyzer were installed with an optical axis of /4, 0 and 0, respectively. An objective lens with a long working distance (Mitsutoyo, G Plan APO 50) was employed. Digital images of 640 480 pixels are taken by a high speed CCD camera (Hamamatsu, C9300-201) with a 12-bit A-D converter, which can directly transfer 160 digital images/sec to RAM in the computer. A halogen lump was used as a light source, and wavelength was selected by using interference filters. We prepared an LCM employing a commercially available liquid crystal (ZLI-4792) and ITO-coated glass plates. The retardation was varied by an application of AC voltage of 0 -10 V with a frequency of approximately 100 Hz to the LCM in this experiment. The voltages corresponding to the LCP, the LP, the RCP were determined by measuring an extinction ratio of a maximum intensity Imin and a minimum intensity Imax, of the output light. Figure 2 shows extinction ratios for a wavelength of 550 nm. Maxima and a mini...

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“…In those technique, MOD methods are advantageous not only for the homogeneity of the thin film, the controllability of composition, and the formation over a large area, but also for the good productivity, since MOD solutions have good stability for more than several years 9) . In this paper, we report on Bi-substitute yttrium iron garnet thin films for MO indicator films without zigzag-shaped magnetic domains by a metal organic decomposition (MOD) method.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical Indicator Garnet Films Grown by Metal-organic Decomposition Method

et al. 2008

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Bi-substituted yttrium iron garnet, Y3-xBixFe5O12 (Bi:YIG, x = 1, 1.5), films were prepared on Gd3Ga5O12 (111) substrates by metal-organic decomposition (MOD) method to use as MO indicator films. Those films had the in-plane magnetic anisotropy and Faraday rotation as large as that of the single crystal and do not show prominent magnetic domain structure, which is often observed in single crystalline garnet films grown by liquid phase epitaxy method. Disappearance o magnetic domain structure can be attributed to a granular structure with a grain size of 50 nm in Bi:YIG thin films. The characteristics are suitable for MO indicator films to visualize a stray magnetic field strayed from a specimen. In this paper, MO imaging of Nb films with groove patterns is demonstrated.Key wor ds : magneto-optical imaging, magneto optical indicator film, Bi-substituted garnet, superconductor I ntro ductionMagnetic imaging technique utilizing magneto-optical (MO) effect has been attracting attentions because it has comprehensive advantages of a fast measurement, a high resolution, a wide range of operating temperature, a quantitative evaluation of magnetic fluxes, etc., compared with recently developed magnetic microscopes such as a magnetic force microscope, a SQUID microscope etc. 1) . Bi substituted rare-earth iron garnet films have been used as an MO indicator film that makes magnetic flux distribution visible by utilizing its huge Faraday rotation in the visible to infrared range.In addition to a high sensitivity of approximately 1 Oe, to obtain a high resolution that is high enough to be within the optical limit in MO imaging, high quality garnet thin films with a thickness as thin as 1 μm are required, since the magnetic flux generated by the samples rapidly diminishes with distance from the samples 2) . Moreover, the zigzag-shaped magnetic domain structure often observed in single crystalline garnet films is a problem which should be solved, because it disturbs the MO observation, as discussed later.Bi substituted garnet films have been prepared by several techniques, such as a liquid phase epitaxy (LPE) 3) , an RF magnetron sputtering 4) and a thermal decomposition method [5][6][7][8] , etc.In those technique, MOD methods are advantageous not only for the homogeneity of the thin film, the controllability of composition, and the formation over a large area, but also for the good productivity, since MOD solutions have good stability for more than several years 9) . In this paper, we report on Bi-substitute yttrium iron garnet thin films for MO indicator films without zigzag-shaped magnetic domains by a metal organic decomposition (MOD) method. The total concentration of carboxylates in those MOD solutions was fixed at 3%. It should be noted that these MOD solutions are stable and precipitation or other changes have not been observed over two years.These solutions were spin-coated on the gadolinium gallium garnet, Gd3Ga5O12, (111) substrates in a 2 step process: 500 rpm for 5 s and 3000 rpm for 30 s, followed by drying at 1...

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Characterization of epitaxial (Y,Bi)3(Fe,Ga)5O12 thin films grown by metal-organic decomposition method

Cited by 71 publications

References 12 publications

Nd_3-xBi_xFe₄GaO₁₂(x = 2, 2.5) films on glass substrates prepared by MOD method

Nd_3-xBi_xFe₄GaO₁₂(x = 2, 2.5) films on glass substrates prepared by MOD method

Real Time Magneto-optical Imaging using Liquid Crystal Modulator

Magneto-optical Indicator Garnet Films Grown by Metal-organic Decomposition Method

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Characterization of epitaxial (Y,Bi)3(Fe,Ga)5O12 thin films grown by metal-organic decomposition method

Cited by 71 publications

References 12 publications

Nd3-xBixFe4GaO12(x = 2, 2.5) films on glass substrates prepared by MOD method

Nd3-xBixFe4GaO12(x = 2, 2.5) films on glass substrates prepared by MOD method

Real Time Magneto-optical Imaging using Liquid Crystal Modulator

Magneto-optical Indicator Garnet Films Grown by Metal-organic Decomposition Method

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Product

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Nd_3-xBi_xFe₄GaO₁₂(x = 2, 2.5) films on glass substrates prepared by MOD method

Nd_3-xBi_xFe₄GaO₁₂(x = 2, 2.5) films on glass substrates prepared by MOD method