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  • 1
    Electronic Resource
    Electronic Resource
    Matrix effect of bombardment-induced Gibbsian segregation on Cu depletion at a Cu x Ni100−x subsurface (1995)
    Springer
    Applied physics 61 (1995), S. 419-423 
    Details
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A dynamic Monte-Carlo program, including an improved BIGS (Bombardment-Induced Gibbsian Segregation) model was employed to study the matrix effect of BIGS and its influence on Cu depletion at the subsurface under 1 keV Ar-ion bombardment of a Cu−Ni alloy. The calculation results show that not only at high fluences (the steady state) but also at low fluences, the Cu subsurface depletion depends on its bulk composition. This is because the atomic jump rateW 21 of Cu from the second layer to the first layer is correlated to Cu bulk composition at any fluence. We also found that the product of the non-segregating species concentration at the first layer with the segregating species concentration at the second layer plays a more important role than other parameters in determiningW 21 under low current conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540117
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  • 2
    Electronic Resource
    Electronic Resource
    Matrix effect of bombardment-induced Gibbsian segregation on Cu depletion at a CuxNi100−xsubsurface (1995)
    Springer
    Applied physics 61 (1995), S. 419-423 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  A dynamic Monte-Carlo program, including an improved BIGS (Bombardment-Induced Gibbsian Segregation) model was employed to study the matrix effect of BIGS and its influence on Cu depletion at the subsurface under 1 keV Ar-ion bombardment of a Cu–Ni alloy. The calculation results show that not only at high fluences (the steady state) but also at low fluences, the Cu subsurface depletion depends on its bulk composition. This is because the atomic jump rate W 21 of Cu from the second layer to the first layer is correlated to Cu bulk composition at any fluence. We also found that the product of the non-segregating species concentration at the first layer with the segregating species concentration at the second layer plays a more important role than other parameters in determining W 21 under low current conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540117
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  • 3
    Electronic Resource
    Electronic Resource
    18-Hydroxy-11-deoxycorticosterone. Chemical synthesis, structure, and circular dichroism (1976)
    s.l. : American Chemical Society
    The @journal of organic chemistry 41 (1976), S. 2552-2556 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00877a010
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  • 4
    Electronic Resource
    Electronic Resource
    Photoreflectance measurements on Si δ-doped GaAs samples grown by molecular-beam epitaxy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4149-4151 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate δ-doped GaAs samples grown by molecular-beam epitaxy with different silicon areal concentration and cap layer thickness, using photoreflectance spectroscopy. The features observed on the high-energy side of the fundamental gap are attributed to transitions involving electronic sub-bands in the δ-doped potential well that take into account the diffusion of the dopants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344976
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluation of sintered and reground Nd-Fe-B alloys with Co, Dy and Al substitutions for use in bonded magnets : 35TH Annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5498-5500 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crushing sintered Nd-Fe-B into coarse powders quickly destroys their coercivity and alignability in a magnetic field, making them useless for bonded magnets. But a double anneal of 890 °C/1 h plus 570 °C/1 h can largely restore these properties for particles (approximately-greater-than)200 μm. Alloys modified with two or more of Co, Dy, and Al additions suffer much lower Hci and Hk losses during grinding. They also respond favorably to annealing, but less than the ternary alloy. Sintered magnets of four compositions were prepared in many size fractions between ∼50 and 1600 μm and demagnetization curves measured as-crushed, after single and double anneals. Powders of alloys (Nd0.88Dy0.12)(Fe0.8−xCo0.12B0.08 Alx)5.5, where x=0.012 and 0.036, retain Hci values above 10 kOe down to ∼200 μm and could be quite useful in bonded magnet fabrication. This paper reports detailed results for two selected compositions: the six-component alloy with x=0.012 and ternary Nd-Fe-B.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347979
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  • 6
    Electronic Resource
    Electronic Resource
    Femtosecond coherent transient infrared spectroscopy of CO on Cu(111) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 4421-4427 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Femtosecond infrared coherent transients have been measured for the stretch vibration of CO on Cu(111). The free induction decay exhibits a dephasing time (T2) of 2±0.3 ps (and 2±0.1 ps assuming a single exponential decay between 2 and 3 ps). The decay was best fit by exponential relaxation, thereby suggesting that the CO vibrational band is almost entirely homogeneously broadened. The surface sum frequency spectrum was also measured at two coverages (0.10 and 0.45 L) using spectrally narrowed pulses. Interferences were observed leading to a determination of the relative phase and amplitude of the resonant and nonresonant second-order susceptibility in this system. The magnitude of the nonresonant susceptibility was only weakly dependent on coverage, suggesting that the nonresonant polarizability originates in the bulk Cu. Time and frequency domain results were in good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463884
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational and rotational relaxation times of solvated molecular ions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5499-5507 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared pump–probe and infrared polarization spectroscopy have been used to measure the vibrational relaxation times (T1) of the antisymmetric stretching mode and the reorientation times (TR) for N3−, NCS−, and NCO− in D2O and/or methanol. For N3−, experiments were also conducted in H2O and hexamethyl–phosphamide (HPMA) solutions. The rapid vibrational relaxation and slow reorientation observed demonstrate strong coupling between the ions and the solvents. Longer vibrational relaxation and shorter reorientation times measured for NCS− reveal weaker solvent interactions that may be due to the importance of the charge distribution and the form of the normal coordinate. A comparison of the T1 and TR times in different solvents permits a determination of the relative interaction strengths for the solvents investigated. The relatively weaker coupling of N3− in the aprotic solvent HMPA demonstrates the importance of hydrogen bonding in strong solvent interactions in ionic solutions. The experimental results are compared with recent molecular dynamics simulations of ionic solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464899
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of substrate hot-carrier injection on quasibreakdown of ultrathin gate oxide (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 6590-6592 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The quasibreakdown (QB) of ultrathin gate oxide under substrate hot-hole and -electron injection was investigated. It has been found that hot-carrier injection greatly degrades the immunity to the QB and the hot hole is more effective than the hot electron in the degradation. The phenomenon was explained by an interface damage-controlled mechanism and verified again by monitoring the interface state densities at the onset point of QB. It also has been found that QB occurs when the interface state density reaches a critical value, regardless of the stress current density and stressing carrier type. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371626
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of ion-irradiation-induced disorder on the low-field magnetoresistance of La0.67A0.33MnO3 (A=Sr, Ca) (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4791-4793 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a systematic study of the correlation between the disorder produced by ion irradiation and the magnetoresistance (MR) behavior of two doped manganite films: a highly textured La0.67Sr0.33MnO3 film on a (100) LaAlO3 substrate and a film of La0.67Ca0.33MnO3 on a YSZ substrate with a high degree of large-angle grain boundary disorder. The films were grown via metal organic chemical vapor deposition and exposed to irradiation of 200 keV Ne ions. The temperature and field dependence of the resistivity were measured on the same samples at different levels of damage. For the Sr-doped film, the bulk magnetic properties were observed to degrade faster with cumulative damage than transport. For both films at low temperature, a low-field hysteretic MR was either induced or enhanced by ion damage. These effects are discussed in terms of diffusive transport through "granular" magnetically disordered regions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370483
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  • 10
    Electronic Resource
    Electronic Resource
    Interlayer segregation of Cu atoms in Ta/NiFe/Cu/NiFe/FeMn/Ta spin-valve multilayers and its influence on magnetic properties (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3759-3763 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results show that the exchange coupling field (Hex) of NiFe/FeMn for Ta/NiFe/FeMn/Ta multilayers is higher than that for spin-valve multilayers Ta/NiFe/Cu/NiFe/FeMn/Ta. In order to find out the reason, the composition and chemical states at the surface of Ta(12 nm)/NiFe(7 nm), Ta(12 nm)/NiFe(7 nm)/Cu(4 nm), and Ta(12 nm)/NiFe(7 nm)/Cu(3 nm)/NiFe(5 nm) were studied using x-ray photoelectron spectroscopy. The results show that no elements from lower layers float out or segregate to the surface in the first and second samples. However, Cu atoms segregate to the surface of Ta(12 nm)/NiFe(7 nm)/Cu(3 nm)/NiFe(5 nm) multilayers, i.e., Cu atoms segregate to the NiFe/FeMn interface for Ta/NiFe/Cu/NiFe/FeMn/Ta multilayers. We believe that the presence of Cu atoms at the interface of NiFe/FeMn is one of the important factors which causes the exchange coupling field (Hex) of Ta/NiFe/Cu/NiFe/FeMn/Ta to be weaker than that of Ta/NiFe/FeMn/Ta. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1450033
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