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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of defect energy levels in the limit of low emission rates (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2854-2858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new deep level transient spectroscopy (DLTS) analysis method is presented. This method operates in the limit of large emission times which leads to a major simplification of standard DLTS calculations. This analysis can be applied as data is collected, and yields defect energy levels completely independent of the thermally activated cross section. This modification is especially useful in separating closely spaced energy levels not resolvable by standard analysis methods. Specifically, in the modified technique the shallower energy level is reliably determined. As an example, the new technique is applied to the energy level splitting of EL2 in n-type gallium arsenide induced by uniaxial stress. Our preliminary results for stress applied along 〈100(approximately-greater-than) indicates that C3v and Td symmetries are incompatible with this defect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353012
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  • 2
    Electronic Resource
    Electronic Resource
    Exchange anisotropy in oxide passivated Co fine particles : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6964-6966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oxide passivated Co particles have been prepared by vapor deposition in the size range of 50–350 A(ring). A strong exchange anisotropy was observed due to the core-shell structure of the Co particles, where the core consists of metallic Co and the shell of Co oxides. The exchange anisotropy of the particles was studied using shifted hysteresis loops after the sample was field cooled (FC). The shift in the FC loop exhibited a maximum at a particle size of 80 A(ring) (shift=10.7 kOe) and is related to the amount of surface oxidation. The shift in the loops disappeared around 150 K in all the samples irrespective of their particle size, and this is attributed to the superparamagnetic behavior of the antiferromagnetic oxide shell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352398
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of oxide layer on the hysteresis behavior of fine Fe particles : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5888-5890 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of surface oxidation on the structural and magnetic properties of fine Fe particles prepared by the evaporation technique have been studied using transmission electron microscopy, x-ray photoelectron spectroscopy, superconducting quantum interference device magnetometry, and Mössbauer spectroscopy. By varying the argon pressure, particles were obtained with sizes in the range of 60–350 A(ring). The hysteresis behavior was found to be strongly dependent on the variation in the amount of surface oxidation. The differences in the magnetic behavior due to variation in size and oxidation have been explained by considering a shell/core model for the particle morphology with the shell consisting of Fe oxides surrounding the α-Fe core.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350096
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of amorphous B-rich R-Fe-B alloys : 35th annual conference on magentism 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. 5340-5342 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of amorphous and crystallized B-rich R-Fe-B alloys with R=Y, Pr, Nd, and Gd have been studied from 4.2 to 300 K using ac susceptibility and SQUID magnetometry. The amorphous samples with R=Y, Pr, and Nd show spin-glass-type transitions with ordering temperatures at about 150, 200, and 250 K, respectively. The magnetization of the samples is found to decrease from light to heavy rare earths to yttrium corresponding to μFe values from 1.35 to 0.74 μB. The magnetic properties can be explained by a noncollinear arrangement of the rare-earth and Fe magnetic moments. Crystallized samples consist of multiple phases with R1.1Fe4B4 as the majority phase; for the 12% Nd sample Fe2B is believed to be one of the minority phases while for 13% Nd the minority phase is R2Fe14B.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348022
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  • 5
    Electronic Resource
    Electronic Resource
    Structural properties of fluorinated amorphous carbon films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 621-623 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fluorinated amorphous carbon films have been deposited in a plasma-enhanced chemical vapor deposition system, and the optical properties examined by Fourier transform infrared and ultraviolet-visible absorption spectroscopy. The infrared absorption spectra in the region from 1000 to 1800 cm−1 were resolved into ten peaks, which were assigned to various carbon–fluorine and carbon–carbon vibration modes. A relationship between the optical band gap and the aromatic carbon (sp2) concentration is demonstrated. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371910
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  • 6
    Electronic Resource
    Electronic Resource
    Plasma enhanced metalorganic chemical vapor deposition of amorphous aluminum nitride (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5825-5831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma enhanced deposition of amorphous aluminum nitride (AlN) using trimethylaluminum, hydrogen, and nitrogen was performed in a capacitively coupled plasma system. Temperature was varied from 350 to 550 °C, and pressure dependence of the film structure was investigated. Films were characterized by Fourier transform infrared, Rutherford backscattering (RBS), ellipsometry, and x-ray diffraction (XRD). The films are amorphous in nature, as indicated by XRD. Variations in the refractive index were observed in ellipsometric measurements, which is explained by the incorporation of carbon in the films, and confirmed by RBS. Capacitance–voltage, conductance–voltage (G–V), and current–voltage measurements were performed to reveal bulk and interface electrical properties. The electrical properties showed marked dependence on processing conditions of the AlN films. Clear peaks as observed in the G–V characteristics indicated that the losses are predominantly due to interface states. The interface state density ranged between 1010 and 1011 eV−1 cm−2. Annealing in hydrogen resulted in lowering of interface state density values. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413484
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  • 7
    Electronic Resource
    Electronic Resource
    Subgap excitation of defect band photoluminescence in phosphorous doped hydrogenated amorphous silicon (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4587-4591 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article presents a study of the effect of temperature on the defect band photoluminescence (PL) of moderately phosphorous doped amorphous silicon thin films deposited by magnetron sputtering. We have identified two types of recombination processes responsible for the observed temperature dependence of the defect PL band produced by subgap excitation. One of the processes is similar to that observed in intrinsic hydrogenated amorphous silicon and may originate from the recombination of carriers at band tail states and dangling bonds. The donor-defect pairs at nearest neighbor sites may be responsible for the second recombination process. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363441
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  • 8
    Electronic Resource
    Electronic Resource
    High sensitivity GMR in NiFeCo/Cu multilayers : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6522-6524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetoresistance and magnetic hysteresis in NiFeCo/Cu soft magnetic multilayers with a fixed number of bilayers (six) and magnetic and spacer layer thickness but varying composition has been studied. The highest value of the transverse GMR obtained is 6.8% in a saturation field of ≈40 Oe at room temperature. Very high sensitivity, around 1%-2%/Oe and unconventional easy-axis hysteresis and GMR loop shapes have been observed. The analysis of the GMR effects and the associated hysteretic behavior by using a model that includes biquadratic exchange coupling suggests that the samples are composed of at least two distinctively different parts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358251
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic and structural properties of vapor-deposited Fe-Co alloy particles : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6319-6321 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic properties of two Fe-Co alloy particles with composition Fe100−xCox(x=45,65) were studied using x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy, superconducting quantum interference device magnetometry, and Mössbauer spectroscopy. The particles were nearly spherical in shape with an average particle size around 350 A(ring). Particles formed long chains and showed a core/shell particle morphology. X-ray diffraction and Mössbauer studies showed the presence of bcc α-Fe-Co and CoFe2O4 phases with the former as the majority phase in Fe55Co45 and the latter the majority phase in Fe35Co65. The room-temperature coercivities of both of these samples were much higher than those in Fe particles with values exceeding 2.2 kOe. The Fe35Co65 sample showed a drastic temperature dependence of coercivity from 1.5 kOe at 300 K to 15 kOe at 10 K. The structural and magnetic data suggest a core/shell morphology with the surface oxide layer having a very important impact on both the magnitude and temperature dependence of the coercivity of the whole particle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358253
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of the pinning field and coercivity of NiFe layers coupled with an antiferromagnetic FeMn layer : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6286-6288 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pinning field Hp (the amount of the shift of the hysteresis loops) and the coercivity Hc of the samples of the form glass/Ta 120 A/(Cu 100 A)/NiFe 75 A/FeMn 150 A/Ta 50 A increase almost linearly with decreasing temperature down to 20 K, below which Hc increases sharply. The observed strong positive correlation between Hp and Hc, seems to be reasonably explained by a combination of a newly developed model in which a directional distribution of the pinning field caused by a random distribution of the crystalline orientations in the antiferromagnetic FeMn layer is taken into account and Hoffmann's ripple theory in which the local anisotropy is assumed to be proportional to Hp, although the sharp increase in Hc at very low temperatures remains to be explained. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362039
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