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  • 1
    Online Resource
    Online Resource
    Resistance switching in epitaxial SrCoO x thin films
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 6 ( 2014-08-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 6 ( 2014-08-11)
    Abstract: We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a SrTiO3 (001) substrate. The crystal structure of strontium cobaltite has been known to undergo topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO2.5) and conducting perovskite (SrCoO3−δ) depending on the oxygen content. The current–voltage characteristics of the strontium cobaltite film showed that it could have a reversible insulator-to-metal transition triggered by electrical bias voltage. We propose that the resistance switching in the SrCoOx thin film could be related to the topotactic phase transformation and the peculiar structure of SrCoO2.5.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4893323
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Structural and optical properties of Co x In2S3+ x thin films grown by spray pyrolysis method
    AIP Publishing ; 1986
    In:  Journal of Applied Physics Vol. 60, No. 7 ( 1986-10-01), p. 2357-2360
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 60, No. 7 ( 1986-10-01), p. 2357-2360
    Abstract: CoxIn2S3+x thin films with various relative compositions were grown on thoroughly cleaned glass plates by the spray pyrolysis method. The substrate temperature during growth was maintained at 270 °C and the film then annealed in a vacuum chamber at 2×10−5 Torr at 500 °C for 30 min. The grown CoxIn2S3+x thin films, which had a composition of x=0.0–0.6, showed the tetragonal structure of In2S3, but above x=0.6 the films were amorphous. The energy gap for these films decreased with increasing x composition, and the impurity absorption spectra in near infrared region, ascribed to Co2+ ions, were observed at 13 333, 5970, and 4166 cm−1, which are the 4A2(F)−4T1(P), 4A2(F)−4T1(F), and 4A2(F)−4T2(F) transitions, respectively.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.337145
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1986
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Atomic migration in Ni–Co ferrite
    AIP Publishing ; 1996
    In:  Journal of Applied Physics Vol. 79, No. 8 ( 1996-04-15), p. 5428-5430
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 79, No. 8 ( 1996-04-15), p. 5428-5430
    Abstract: Ni–Co ferrite has been studied with Mössbauer spectroscopy and x-ray diffraction. The crystal structure for this system is spinel, and the lattice constant is in accord with Vegard’s law. The Mössbauer spectra consist of two six-line patterns corresponding to Fe3+ at the tetrahedral (A) and octahedral (B) sites. The Néel temperature increases linearly with Ni concentration, suggesting the superexchange interacion for the Ni–O–Fe link is stronger than that for the Co–O–Fe link. It is found that Debye temperatures for the A and B sites of CoFe2O4 and NiFe2O4 are found to be θA=734 K, θB=248 K, and θA=378 K, θB=357 K, respectively. The intensity ratio of the A to B patterns is found to increase at low temperatures with increasing temperature due to the large difference of Debye temperatures of the two sites and to decrease at high temperatures due to migration of Fe3+ ions from A to B sites. Atomic migration of CoFe2O4 starts near 400 K and increases rapidly with increasing temperature to such a degree that 69% of the ferric ions as the A sites have moved over to the B sites by 780 K. It is noted that, as the Ni concentration in cobalt ferrite increases, the Debye temperatures tend to decrease the migration at the A and B sites is slow.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.362328
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Optical properties of AgGa1− x In x Se2 thin films
    AIP Publishing ; 1985
    In:  Journal of Applied Physics Vol. 58, No. 12 ( 1985-12-15), p. 4594-4597
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 58, No. 12 ( 1985-12-15), p. 4594-4597
    Abstract: The variation of optical properties with the relative composition of AgGa1−xInxSe2 thin films prepared by the flash evaporation method (FEM) and the electron-beam evaporation method (EBEM) has been investigated. Single-crystalline films with (112) surfaces and polycrystalline thin films were grown, respectively, by FEM and EBEM with the former having the chalcopyrite structure. The energy gap for AgGa1−xInxSe2 thin films decreased with increasing X composition and a discontinuity near X=0.6 was observed for the crystalline thin films but not in the amorphous thin films. Also, the energy gap and the photoconductivity peak energy of these films decreased with increasing ambient temperature. The temperature coefficient of the energy gap is −(4–9)×10−6 eV/K (50–100 K) and −(2–7)×10−5 eV/K (100–300 K), and that of the photoconductivity peak energy is −(2.7–6.6)×10−5 eV/K (50–100 K) and −(4.3–7.8)×10−4 eV/K (100–300 K).
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.336252
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1985
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Effects of additives on magnetic properties of sheet Sr-Ba ferrite magnets
    AIP Publishing ; 1994
    In:  Journal of Applied Physics Vol. 76, No. 10 ( 1994-11-15), p. 6877-6879
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 76, No. 10 ( 1994-11-15), p. 6877-6879
    Abstract: Sr0.75Ba0.25Fe12O19 hexagonal ferrite has attracted much attention due to its large (BH)MAX values and workability. We have prepared sheet magnets by the Dr. Blade method. To examine the effects of additives, such as SiO2, TiO2, Al2O3, and Cr2O3, on magnetic properties of sheet magnets, we used VSM magnetometer, x-ray diffraction, and Mössbauer spectrometer. The crystal structure is found to be a magnetoplumbite of typical M-type hexagonal ferrite, but the α-Fe2O3 phase develops with increasing additives concentration. Using our refined computer program, we have analyzed the Mössbauer spectra in the temperature range from 13 to 800 K. The Mössbauer spectra indicate that the line intensity for the 12k site is reduced with increasing SiO2 concentration, which is different from the reports of Fe-substituted Ba ferrite. This suggests that the developing α-Fe2O3 phase is related to 12k sites. The isomer shifts show the charge states of Fe ions is ferric. When the additives concentrations increase, the Curie temperatures, Tc go down. One sextet for α-Fe2O3 phase still persists above Tc, so it suggests that the high-Tc values do not result from α-Fe2O3. While Al2O3 and Cr2O3 additives increase coercive force Hc, the other additives reduce it.  
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.358099
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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