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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic characteristics of RCo13−xSix alloys (R=La, Pr, Nd, Gd, and Dy) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5949-5951 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetism of LaCo13-type alloys such as LaCo13, PrCo13−xSix, etc., has recently received considerable attention as potentially useful magnetic materials. The present study is concerned with RCo13−xSix where R=La, Pr, Nd, Gd or Dy. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362116
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  • 2
    Electronic Resource
    Electronic Resource
    The stopping power of 1–3 MeV hydrogen and helium in polyimide (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2312-2316 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stopping power for hydrogen (1H)and helium (4He) in thermally imidized pyromellitic dianhydride-oxydianaline polyimide was measured using the thin-film backscattering method. As the incident energy increased from 1 to 3 MeV, the hydrogen stopping power decreased from 4.2 to 1.8 eV/(1015 atoms/cm2), whereas the helium stopping power decreased from 33.6 to 18.6 eV/(1015 atoms/cm2). These results were in excellent agreement with values predicted by either Bragg's rule or the cores-and-bonds model. This work demonstrates the advantages of using spun-cast thin (〈3 μm) polymer films supported on silicon wafers for stopping power measurements. Prior measurements of the stopping power relied on transmitting the ion beam through relatively thick (∼10 μm) free-standing films where the uncertainty in the film thickness often introduced significant systematic errors. With polymer films supported on silicon, ellipsometry can be used to accurately determine film thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356273
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  • 3
    Electronic Resource
    Electronic Resource
    SmCo (2:17-type) magnets with high contents of Fe and light rare earths : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6280-6282 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of SmCo (2:17-type) magnets with high contents of Fe (v=Fe/3d(approximately-greater-than)0.34) and/or light rare earths (up to 0.4) were investigated. For magnets with compositions of Sm(FevCobalZr0.02Cu0.06{Ga}x)7.72, v=0.35, x=0–0.06, both iHc and (BH)max can be improved significantly by Ga doping, from 1.0 kOe and 5.4 MG Oe for x=0 to 6.4 kOe and 15.4 MG Oe for x=0.06. For magnets with compositions of Sm0.8Pr0.2(FevCobalZr0.02Cu0.06)7.67, v=0.30–0.31, iHc can be increased strikingly by a special heat treatment, from 2.5 to over 20 kOe for v=0.30 and from 0.5 to 15.5 kOe for v=0.31. Examining magnets with compositions of Sm0.59Pr0.41(Co0.68Fe0.20Cu0.10Zr0.02)z (z=6.68–7.75) shows two stages of the magnetization reversal process in the range of 5.5 to 9.5 kOe and 16 to 19 kOe. Observed (BH)max ranged from 17 to 22.5 MG Oe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355424
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic and structural characteristics of LaCo9+δSi4 and LaCo8.5+δSi4.5 alloys (δ=0–4) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6331-6333 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: LaCo9+δSi4 and LaCo8.5+δSi4.5 alloys with δ=0 to 4 have been synthesized and characterized. The stoichiometric alloys (δ=0) have low Tc and small moments, whereas the alloys with δ≠0 have larger Tc and magnetization. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361989
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of Fe16N2 in bulk form : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6574-6576 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using molecular beam epitaxy and ion implantation, Japanese workers have formed Fe16N2 in thin Fe films. They report a large magnetic induction for this nitride, ≥2.8 T. In the present study, Fe16N2 has been prepared in bulk form by treating Fe powder with NH3/H2 gas mixtures at temperatures in the range 660–670 °C. The γ phase alloy, which forms under these conditions, was quenched to room temperature to form the α'-Fe-N phase and then heat treated at 120–150 °C to form the α‘-Fe-N phase. The α' phase has been prepared in 80% purity, the other phase being nonmagnetic γ-Fe-N. The α‘ phase has been prepared in 50% purity, the impurity phases being α-Fe and γ-Fe-N. Magnetic measurements give saturation magnetizations at room temperature of 250±10 emu/g (2.6μB/Fe) for the α' phase, 285±10 emu/g (2.9μB/Fe) for the α‘ phase, and essentially zero for the γ phase. Mössbauer measurements confirm that nitrogen austenite is nonmagnetic. The anisotropy of Fe16N2 is small but detectable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356925
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  • 6
    Electronic Resource
    Electronic Resource
    Enhanced Fe moment in nitrogen martensite and Fe16N2 (invited) : 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. 6648-6652 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nitrogen martensite was prepared by treating fine Fe powder with NH3/H2 gas mixtures at temperatures around 665 °C. Upon quenching to a temperature Tq, the γ phase which had formed at the elevated temperature undergoes a martensitic transformation to form nitrogen martinsite (α' Fe-N alloy), a tetragonal material. Heat treating this material for 1–2 h at 140±10 °C produced the α‘ phase Fe16N2. The α' phase occurred along with γ Fe-N. From x-ray line intensities, the amount of α' phase was ascertained. The α' phase exhibits a room-temperature moment of 250±10 emu/g. Fe16N2 is formed along with α Fe and also there is retained N-austenite. Using XRD and conventional magnetic measurement procedures, one obtained 280±10 emu/g for the saturation moment of Fe16N2. The experimental Fe moment, 2.88 μB, is in excellent agreement with the most recent band-structure calculations, 2.85 μB. The ternary systems (Fe,M)16N2 were studied with M=Mn or Ni. γ Fe-Mn nitride readily forms, but it does not undergo the γ→α' transformation. The α' phase and possibly the α‘ phase form in the Fe-Ni nitride.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358158
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  • 7
    Electronic Resource
    Electronic Resource
    Mass density of polystyrene thin films measured by twin neutron reflectivity (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 3798-3804 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Neutron reflectivity measurements on polystyrene thin films (6.5–79.0 nm thick) supported on silicon substrates indicate that the mass density is near the bulk value regardless of film thickness. To account for possible inaccuracies arising from sample misalignment, reflectivity measurements were made both from the free-surface and silicon-substrate sides of the thin film, a method termed twin reflectivity. For films spin coated on the hydrogen-terminated silicon surface the relative uncertainty in the density measurement was on the order of 1%, but for films spin coated onto the silicon native-oxide surface the analysis was more difficult because of subtleties in data fitting due to the oxide layer. Nevertheless, within the limits of greater uncertainty, these films also showed no systematic change in density with thickness. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475769
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  • 8
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of Tm2−xDyxFe14B and Tm2Fe14−xCoxB alloys systems (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5540-5542 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and intrinsic magnetic characteristics of Tm2−x Dyx Fe14 B (for the entire range of composition) and Tm2 Fe14−x Cox B (for x up to 4) were investigated in detail between 4.2 K and their Curie temperatures. Progressive replacement of Tm by Dy enhances the anisotropy field HA markedly. This was evidenced from the expansion of the uniaxial anisotropy temperature range determined by constructing the magnetic-phase diagram. These results are found to be in very good agreement with the crystal field theory, employing the second-order terms. Addition of Co in the lattice improves the magnetic ordering temperature, but reduces the saturation magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342329
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  • 9
    Electronic Resource
    Electronic Resource
    Prediction of magnetic phase diagrams of selected (RxR'1−x)2Fe14B systems (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3964-3966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preliminary experiments on (TmxDy1−x)2Fe14B have suggested the presence of axial, conical and planar regions in the magnetic phase diagram. Here we report the magnetic phase diagram for this and other mixed rare-earth systems, as predicted by second-order crystal field theory. The specific systems considered were those containing (Er or Tm) and (Pr, Tb, or Dy). It is shown that in these systems, which contain two rare-earth ions of opposite second-order Stevens coefficients, the occurrence of all three regions can be accounted for by second-order crystal field theory. The shapes of the phase boundaries are discussed in terms of the stabilization energies of the various rare earth ions. In particular, it was found that the relatively strong temperature dependence of the stabilization energies of Pr and Tm is responsible for low-temperature contractions of the planar and axial phases, respectively. This temperature dependence is attributed to the weaker exchange interaction [(g−1)J〈1] experienced by these ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340564
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of quaternary Pr2−xRxCo14B (R=Dy and Er) systems and their hydrides (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3972-3974 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-phase materials of quaternary Pr2−xRxCo14B (R=Dy or Er), which crystallize in the Nd2Fe14B-type tetragonal structure, form for the compositions only up to about x=1.5. Measurements of lattice parameters and the bulk magnetization were carried out on these compounds and their hydrides. Saturation magnetizations Ms, magnetic ordering temperatures Tc, spin-reorientation temperatures Tsr, and anisotropy fields were determined. Pr2Co14B exhibits a transition between uniaxial and planar anisotropy, with increasing temperature. Partial replacement of Dy or Er for Pr in the Pr2Co14B lattice reduces the observed Tsr and HA values. Substitution with Dy in Pr2−xRxCo14B has a smaller effect than with Er. This behavior is believed to be a consequence of a stronger crystal field interaction in the Dy-substituted systems. All materials investigated were found to absorb about 3.5 hydrogen atoms per formula unit at an applied pressure of 10 atm. Introduction of hydrogen into the alloy expands the lattice, changes the magnetic moment of the system slightly and reduces Tsr and HA significantly. This effect is found to be stronger in the Dy-substituted compounds. The weakening of the 4f-3d exchange interactions relative to crystal field interactions of the 4f ions is considered to be responsible for lowering the anisotropy fields upon hydrogen absorption. The results obtained for the host and the hydrides are discussed in terms of their proposed magnetic phase diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340567
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