102 research outputs found
Synthesis of ferromagnetic Bi-substituted yttrium iron garnet films by laser ablation
Bismuthâsubstituted yttrium iron garnet (Bi:YIG) films were deposited on gadolinium gallium garnet substrate by laser ablation using the ArF excimer laser. This is the first report on the preparation of Biâsubstituted YIG films by laser ablation. Films have a garnet single phase above the substrate temperature of 490â°C, and the film composition does not deviate largely from the target composition and it is almost constant in the temperature range between 490 and 580â°C. The saturation magnetization of the film is 1500 G at room temperature. Faraday rotation angle ΞF at a wavelength of 830 nm at room temperature is -0.3Ã104 °/cm
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ãPb(Zr_Ti_x)O_3(PZT)çšé»æ¥µãšããŠææ¡ããŠããNiåéãçšããŠPZTäžæ®çºã¡ã¢ãªãæ§æããç²åŽã®åšæ³¢æ°ç¹æ§ã調ã¹ãããã®çµæãç²åŽç¹æ§ã«ãããŠå€§ããªåšæ³¢æ°äŸåæ§ãæããããšãæããšãªã£ããããã¯Niåéäžã®PZTã¯çµæ¶æ§ãããŸãè¯ããªããæé»çã倧ããã¹ã€ããã³ã°é床ãå°ãããªã£ãŠãããããšèããããããŸãããã®ç²åŽã¯é»æ¥µãšã®çé¢ããPZTåŽãžåäžã«é²è¡ããç²åŽã¢ãã«ã§èª¬æããããããã«ãæ¬ã¡ã¢ãªã¯ã¹ã€ããã³ã°é»è·éã¯å°ãããã®ã®ãåšæ³¢æ°50kHzã«ãããŠ10^åã®ã¹ã€ããã³ã°åŸãåæã®é»è·éã倱ããé«ãç²åŽèæ§ã瀺ãããçµæ¶æ§ãšç²åŽç¹æ§ã®é¢ä¿ãæãã«ããããé
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åãããããã¹ã«ã€ãPZTãåŸãããšãã§ããããŸããP-Eå±¥æŽæ²ç·ã®æž¬å®ã§åŒ·èªé»æ§ã確èªãããããããC-Vç¹æ§ã§ã¯è¯å¥œãªã¡ã¢ãªç¹æ§ãåŸããããMgO/Siçé¢ã®å£åã瀺åããããFor metal/ferroelectrics/metal (MFM) memory, ferroelectric lead-zirconate-titanate (Pb (Zr_Ti_) O_3 : PZT) thin-film capacitors were fabricated by ArF pulsed laser ablation (PLA) using Ni-alloy electrodes on oxidized (100) silicon. The fatigue test revealed that the increase in the frequency both for acceleration and measurement of switching pulse increases the life of polarization reversal while it decreases the switched charge density Q_. At 50 kHz, Q_W keeps the initial value even after switching above 10^ cycles. The measurement frequency dependence of Q_ suggests that a homogeneous fatigue takes place irrespective of fast and slow domains and additional layrs of a low dielectric constant are probably formed in the ferroelectric-metal interface.The effect of various electrodes on the ferroelectric properties of PZT films through the film structure is also presented. These experiments revealed that there is no simple correlation between the film structure and the fatigue resistance. The fatigue resistance is, however, found to be improved primarily by decreasing Q_, although the correlation shows some ambiguity. For examining the fatigue properties, titanium-aluminum-nitride (Ti-Al-N ; TAN) electrode films were proposed for PZT thin-film capacitors. Capacitors with rather randomly oriented PZT films on the TAN/(100) Si did not show a ferroelectric hysteresis loop, but the capacitor with preferentially [100] -oriented PZT film on the TAN/(100) MgO did. This suggests that a TAN-electrode film was grown on (100) MgO with a high oxidation resistance at the high temperature employed for ferroelectric oxide preparation.For metal ferroelectrics/insulator/semiconductors-(MFIS-) FET memory, PZT/MgO/(100) Si structure was proposed. The PZT film obtained was found to be highly oriented perovskite PZT film with a ferroelectric P-E hysteresis.ç 究課é¡/é åçªå·:06650010, ç 究æé(幎床):1994â1995åºå
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ãããŠãããã§ãªç£æ§ã¬ãŒãããYttrium Iron Garnet(YIG)èèã®äœè£œãè¡ã£ããNd^:YAGã®ç¬¬2é«èª¿æ³¢ãçšããŠäœè£œæ¡ä»¶ãæé©åãã(111)GGGåºæ¿äžã§åªå
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ãright filled triangleãH=7.5Oeãæããããšã確èªãããããã®å€ã¯ã1Oe以äžã®å€ãå ±åãããŠããLPEèã«ã¯åã°ãªãããæ°çžæ³ã§äœè£œãããèèã®äžã§ã¯è¯å¥œãªãã®ã§ãããPulsed laser ablation (PLA) is known to have quite unique features in deposition process, I.e., the depositing particles consist of atomic species, clusters, and molten droplets with micron size. The aim of this study is to investigate the fabrication process of thin-film depositions by PLA using the molten droplets. In PLA process, it has been believed that droplets must be eliminated. Liquid phase epitaxy (LPE) is equilibrium process, while vapor phase epitaxy (VPE) is non-equilibrium process. In order to grow a high quality film with a low defect density, crystal growth by PLA using large number of molten droplets will be an attractive technique that allows LPE-like crystal growth using VPE-like vacuum system.First, germanium (Ge) was employed for this study. The second harmonic of YAG laser (532 nm) was employed for producing Ge droplets efficiently. Ge film prepared at room temperature was found to have a large number of solidified droplets on the substrate. As the substrate temperature was elevated up to 600 â , Ge film was formed as island structure on (100)Si substrates. The x-ray pole figure measurement revealed that Ge film showed growth of Ge crystal aligned in plane as well as out of plane in a manner of cube-on-cube.Yttrium Iron Garnet (YIG) was the second target for this study. YIG is known to be a excellent material for microwave applications. YIG films were grown by PLA on (111)GGG substrates using the YAG laser. Highly oriented YIG crystal were grown on the (111)GGG substrate heated at 860 â by PLA using a large number of molten droplets, suggesting an LPE-like growth. This YIG films shows a small ferromagnetic resonance linewidth of 7.5 Oe. This value is quite small for films prepared by vapor-phase epitaxy techniques.ç 究課é¡/é åçªå·:10450006, ç 究æé(幎床):1998â1999åºå
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Ferroelectric properties of lead-zirconate-titanate films prepared by laser ablation
Ferroelectric leadâzirconateâtitanate (PZT) thin films have been deposited by excimer laser ablation on sapphire substrates with and without an electrode. In preparation for the films, O2 gas pressure has greatly influenced the film structure and morphology. For the first time, we have confirmed the ferroelectric properties of PZT films prepared by laser ablation without postâannealing. It appears to be possible to use these films for nonvolatile random access memories with some additional improvements in the film properties
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