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  • 11
    Electronic Resource
    Electronic Resource
    Detection of short-lived intermediates in electrochemical reactions using time-resolved surface-enhanced Raman spectroscopy (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 4766-4769 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100375a004
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  • 12
    Electronic Resource
    Electronic Resource
    Easy-axis transition in epitaxial face-centered-cubic Ni80Fe20/Ni/Cu(100) (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4806 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the effects of ferromagnetic overlayers on the magnetic properties of step-wedged fcc (0–100 Å) Ni80Fe20/50 Å Ni/2000 ÅCu(001) structures. The perpendicular magnetic anisotropy (PMA) was found to be sensitively dependent on the NiFe thickness. An easy-axis transition from out-of-plane to in-plane was found to occur at a NiFe thickness of 36 Å with a corresponding domain structure observed by magnetic force microscopy. The absence of strain in the NiFe film as evidenced by reflection high energy electron diffraction suggests that the volume anisotropy of the NiFe films comes entirely from the shape anisotropy. The easy-axis transition in the fcc NiFe/Ni/Cu(100) system can be understood to result from an additional volume anisotropy which forces the Ni magnetization to lie in-plane. Our findings open a new path to controlling the critical thickness for PMA in this system via ferromagnetic overlayers. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370488
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  • 13
    Electronic Resource
    Electronic Resource
    Crystallization and hard magnetic properties of Fe–Co–Nd–Dy–B amorphous alloys with glass transition (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6122-6124 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Glass transition followed by a supercooled liquid region was observed in the composition range of 4–56 at. %Co, 2–4.5 %Nd, 0–1.25 %Dy, and 18–30 %B in melt-spun Fe–Co–Nd–Dy–B amorphous alloys. The largest value in the supercooled liquid region (ΔTx) was 45 K for Fe66.5Co9.5Nd3.5Dy0.5B20. The crystallized structure consists of 2:14:1, Fe3B, and α-(Fe, Co) phases and their grain sizes after annealing for 420 s at 933 K are 15, 15, and 50 nm, respectively. The interparticle spacing of the 2:14:1 phase is less than 50 nm. The remanence (Br), coercivity (iHc), and maximum energy product (BH)max after an optimum annealing treatment (933 K, 420 s) are 1.24 T, 263 kA/m, and 92 kJ/m3, respectively, for the Fe66.5Co9.5Nd3.5Dy0.5B20 alloy. The rather good hard magnetic properties are interpreted to result from the exchange magnetic coupling among 2:14:1, Fe3B, and α-(Fe, Co) phases. The good hard magnetic properties in the crystallized state of the Fe–Co–Nd–Dy–B amorphous alloys with large ΔTx over 40 K are expected to enable the future fabrication of a bulk hard magnetic material by the simple process of the formation of a bulk amorphous alloy followed by optimum crystallization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372629
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  • 14
    Electronic Resource
    Electronic Resource
    Nucleation Sites of Calcium Phosphate Crystals during Collagen Mineralization (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The nucleation sites of calcium phosphate crystals during collagen mineralization were studied by Fourier transform infrared spectrometry and transmission electron microscopy. It was found for the first time that there is another nucleation site, i.e., carbonyl (〉C=O) on collagen, besides the previous reported nucleation site of carboxyl (–COOH). By comparing the IR spectra of collagen not only with collagen/calcium phosphate but also with collagen/Ca2+, it was observed that the peak intensities of amides I, II, and III of collagen decreased significantly after mineralization. The decrease of the amide I peak intensity was mainly due to blockage of the C=O stretch. Furthermore, the peak for amide I gradually shifted to a lower wavenumber during collagen mineralization. This shift indicated that chemical interaction between carboxyl groups and Ca2+ ions formed in the mineralization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03422.x
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  • 15
    Electronic Resource
    Electronic Resource
    Colossal magnetoresistance behavior in LaCaMnO/CeO2/Si (100) multilayers grown by pulsed laser deposition (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5759-5759 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The La–Ca–Mn–O (LCMO) system grown on lattice matched LaAlO3 substrates by pulsed laser deposition (PLD) has attracted much recent attention because of the colossal magnetoresistance exhibited. Interest in these materials is because of their potential application in the magnetic recording industry where one of the challenges is to integrate the chip signal-conditioning circuits together with the sensing elements. We have previously reported the giant magnetoresistance characteristics of La–Ca–Mn–O films grown on Si (100) substrates by PLD. Although magnetoresistance at 50 K under a field of 4.7 T was more than 35% (Δρ/ρ0), no colossal magnetoresistance values were present, clearly due to the imperfections introduced by the lattice mismatch between film and substrate. In this paper we report the transport properties and colossal magnetoresistance behavior in LCMO/CeO2/Si(100) multilayers grown by PLD. The CeO2 is attractive as a buffer layer due to its lattice constant, a, of 5.411 Å, which is close to that of silicon (the misfit factor, being only 0.35%). And by simply rotating the unit cell 45° in the basal plane, the mismatch is less than 0.16% with LCMO along the a–b plane. It is found that the LCMO/CeO2/ Si(100) multilayers also exhibit a well-defined peak of resistivity versus temperature, a similar behavior to a single LCMO layer on a Si substrate. A magnetoresistance value of more than 93% (Δρ/ρ0) was obtained at 77 K under a field of 12 T. The films have been characterized by vibrating sample magnometer, four-point probe and scaning tunneling microscopy, and details of the influence of the multilayer preparation parameter will also be discussed. ©1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364717
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  • 16
    Electronic Resource
    Electronic Resource
    Longitudinal phonon modes in a ZnSe/ZnSxSe1−x lattice-mismatched superlattice (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5905-5908 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Longitudinal acoustic and optical phonon modes of a ZnSe/ZnSxSe1−x (x(approximately-equal-to)0.20) lattice-mismatched superlattice, prepared with atmospheric metal organic chemical vapor deposition method, have been investigated by light scattering measurements. Despite a lattice mismatch as large as 1% between the alternating layers, the measured longitudinal elastic constants are in agreement with the calculated values of an unstrained effective medium model. Furthermore, a correlative study was made by fitting the spectra to a spatial correlation model, which reproduces line shapes of the observed confined longitudinal-optical modes without incorporating the strain effects. The results demonstrate that a combination of Brillouin and Raman spectroscopy provides a good method to determine accurately the elastic constants and strain information of the lattice-mismatched superlattices and heterostructures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358410
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  • 17
    Electronic Resource
    Electronic Resource
    Second-harmonic generation transition in NaNb3O8 solid solutions (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2334-2335 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An apparent transition between active and nonactive second-harmonic generation (SHG) has been discovered in the NaNb3O8 solid solutions with the tetragonal tungsten bronze structure. No SHG was detected in 0.35Na2O:Nb2O5 solid solution crystal or its powder. Nevertheless, powder SHG with a magnitude comparable to KH2PO4 was observed when a small amount of Nb2O5 was added to the powder ground from the crystal and sintered again. Microcracks and ferroelectric domain boundaries have been observed in the crystal using transmission electron microscopy. The only difference between the lattice images of SHG active powder and non-SHG active powder is the absence of microcracks and ferroelectric domain boundaries in the SHG active powder. Dielectric constant of the 0.35Na2O:Nb2O5 crystal is about 300 and δ is 0.003 for frequency from 120 kHz to 12 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104913
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  • 18
    Electronic Resource
    Electronic Resource
    Phase segregation and giant magnetoresistance behavior in as-deposited Co-Ag film grown by pulsed laser deposition : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5211-5213 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth of Co-Ag granular films on Si (100) substrates by pulsed laser deposition (PLD) is reported. It is found that phase segregation can be directly produced in as-deposited Co-Ag granular films. This is attributed to the high quench rates induced by PLD, unlike the film deposited by sputtering, where post-annealing is required to achieve the required phase segregation. A large magnetoresistance (MR) value of around 27% was obtained at 4.2 K under a magnetic field of 4.7 T in as-deposited Ag0.70Co0.30 films. Our results suggest that the large magnetoresistance values obtained are strongly determined by phase segregation and particle size in association with the laser fluences used. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364470
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  • 19
    Electronic Resource
    Electronic Resource
    Conformational Analysis of Two Cyclic Analogs of Angiotensin: Implications for the Biologically Active Conformation (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 3591-3598 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00178a016
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  • 20
    Electronic Resource
    Electronic Resource
    A concept for nonvolatile memories (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2487-2489 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A concept for nonvolatile memories is proposed in which a unique combination of a Schottky junction with tunable barrier height and an adjacent electron potential well is used. A proof-of-concept demonstration is given for such a class of memory devices using ZnCdMgSe/InP heterostructures. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120096
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