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  • 1
    Electronic Resource
    Electronic Resource
    Rietveld analysis of x-ray powder diffraction patterns for the new SmFe10Mo2Nx nitride compound : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6122-6124 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Considerable improvement of the magnetic properties has been achieved by nitrogen absorption in the RFe10Mo2 compounds with ThMn12-type structure. A lattice expansion has been observed (a=8.6781, c=4.8531 A(ring) for the nitride and a=8.5869, c=4.8002 A(ring) for the nitrogen-free sample) from N2 absorption and a determination of the displaced Sm, Fe, and Mo positions has been achieved from Rietveld analysis for the SmFe10Mo2Nx compound. This structure determination provides some evidence for the site occupation of the nitrogen atoms in the tetragonal ThMn12-type structure. Measurements of an oriented powder sample at 295 K show that the easy magnetization direction is in the (a,b) plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350016
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and characterization of the NdFe10T2Nx (T=Mo,V) compounds with the ThMn12 tetragonal-type structure : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6012-6014 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dramatic changes in the magnetic properties observed in the R2Fe17 alloys upon nitrogen absorption have also been observed in the NdFe10T2Nx (T=Mo,V). The nitrides, prepared at T=773 K and 21/2 atm pressure of N2, showed an increased anisotropy HA (approximately-greater-than) 5 T at RT compared to the HA = 0 for the non-nitrogenated materials. The Curie temperatures increase about 44% and the observed volume expansion is 3.6% for Mo and 2.8% for the V compound although the structure remains the same. A coercive field of 0.97 and 0.45 T has been observed at 4.2 K for NdFe10Mo2Nx and NdFe10V2Nx compounds, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350077
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic hysteresis and Mössbauer studies in ultrafine iron particles (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4487-4489 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic hysteresis behavior of ultrafine Fe particles has been examined by SQUID magnetometry and Mössbauer spectroscopy. Ultrafine Fe particles have been prepared by vapor deposition under argon atmosphere in pressures from 1 to 6 Torr and passivated by exposure to oxygen at low pressure. Particles with size below 10 nm showed a small coercivity (∼100 Oe) at room temperature, which increased drastically upon cooling to cryogenic temperatures (1000–1500 Oe). The larger particles had the highest coercivity at room temperature (∼1000 Oe) which increased by 100% at 10 K. Mössbauer studies revealed that the Fe particles are surrounded by an Fe oxide layer composed of ultrafine Fe3O4 or γ-Fe2O3 grains. At room temperature the oxide component gives a very broad absorption superimposed on an α-Fe spectrum. The enhanced coercivity at room temperature may be attributed to anisotropy induced by exchange interaction between the ferromagnetic core and the ferri- or antiferromagnetic oxide layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344890
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  • 4
    Electronic Resource
    Electronic Resource
    Granular CoPt/C films for high-density recording media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4358-4361 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Granular CoPt/C films, consisting of nanoparticles of the face-centered-tetragonal (fct) CoPt phase embedded in a carbon matrix, have been made by cosputtering from CoPt and C targets using a tandem deposition mode. The as-made films have a disordered face-centered-cubic structure and low coercivity (below 100 Oe). The granular structure is obtained after an aging heat treatment, which is followed by a drastic increase in coercivity to values up to 9 kOe due to the formation of the highly anisotropic fct phase. Transmission electron microscope studies showed the size of the CoPt particles to increase from 5 nm in the as-made state to 7–12 nm in the optimally annealed state. The measured coercivities are much lower than the value expected for noninteracting, randomly distributed single-domain particles. The large discrepancy is attributed to interparticle interactions, particle-size effects, and mainly to a lower anisotropy of the fct phase because of incomplete ordering. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373078
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  • 5
    Electronic Resource
    Electronic Resource
    New CoPt/Ag films for high density recording media (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4304-4306 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CoPt/Ag nanocomposite films have been prepared with magnetic properties promising for potential application in high density magnetic recording media. The films were initially deposited by sputtering, in a multilayer form and found to crystallize in the magnetically soft face centered cubic phase. Annealing leads to a microstructure consisting of the magnetically hard face centered tetragonal CoPt nanoparticles embedded in a Ag matrix. Microstructure and coercivity can be tailored by adjusting the annealing conditions and the relative CoPt/Ag composition. Values of coercivity in the range of 1–17 kOe with grain sizes in the range of 7–100 nm, respectively, have been obtained. Henkel plots of optimally annealed samples show only weak interactions of dipolar nature, characteristic of magnetically isolated single domain particles. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370350
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  • 6
    Electronic Resource
    Electronic Resource
    Mössbauer and magnetization studies of La0.5Ca0.5Mn1−xFexO3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5402-5404 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 57Fe Mössbauer measurements and magnetization data were used to study both microscopically and macroscopically the first-order antiferromagnet-to-ferromagnet (AFM-FM) transition observed in La0.5Ca0.5MnO3. The zero field cooled and field cooled Mössbauer spectra for H≥40 kOe are extremely history dependent and can be fitted by predominantly AFM and FM components, respectively, in agreement with the magnetization data. Our data are consistent with the concept of a first-order, field-induced transition.© 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369991
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  • 7
    Electronic Resource
    Electronic Resource
    Solvation effects in intermediate-spin ferric complexes (1976)
    s.l. : American Chemical Society
    Inorganic chemistry 15 (1976), S. 1340-1343 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50160a019
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of melt-spun rare-earth transition-metal intermetallics with Nd3(Fe,Ti)29 structure (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. 5130-5130 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single phase ingots of Nd3Fe27.5Ti1.5 were prepared by argon arc melting followed by annealing at 1373 K for 72 h in evacuated sealed quartz tubes and water quenching. Pieces of the ingots were then made into ribbons using the spin-melting technique in argon atmosphere with velocities between 20–40 m/s. The ribbon samples were annealed over a range of temperatures 723–1323 K for times in the range 15–50 min. The as-spun ribbons were found to be amorphous and presented a composition close to the nominal one. After annealing, the samples were crystallized and presented the Nd3(Fe,Ti)29-type structure. From the relative intensities of the diffraction peaks it was concluded that the annealed samples presented texture. This was confirmed from the x-ray diffraction patterns of annealed ribbons after powdering which were similar to those of the bulk samples. The lattice parameters are: a=10.63(4) Å, b=8.57(4) Å, c=9.729(5) Å and β=97.01(2)°. Rietveld analysis on the annealed ribbons gave a composition of 60% Nd3(Fe,Ti)29, 21% Nd(Fe,Ti)12, and 19% α-Fe. Thermomagnetic analysis curves of the as-spun ribbons showed a broad transition between 373–433 K and a secondary one at about 553 K indicating the presence of a 1:12 impurity. After annealing, the samples presented a Curie temperature typical for the Nd3(Fe,T)29 compound, 437 K and two secondary magnetic transitions characteristic for the 1:12 and α-Fe phases, respectively. The room temperature saturation magnetization, Ms, was 145.0 and 138.7 emu/g before and after annealing, respectively. Scanning electron microscopy photographs of the annealed ribbons showed a grain size 〈1 μm and the microanalysis of the grains gave a mean stoichiometry Nd3Fe24Ti5 for the 3:29 phase. The coercivity of the annealed samples was 1 kOe at room temperature. This relative low value was attributed to the presence of the soft α-Fe impurity.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364752
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  • 9
    Electronic Resource
    Electronic Resource
    Structural, magnetic, and magnetotransport properties of NiFe/Ag as-deposited multilayers for variable NiFe and Ag layer thickness (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4512-4518 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superstructure refinement analyses of x-ray-diffraction data, magnetotransport, and hysteresis loop measurements were performed in Ni81Fe19/Ag ultrathin multilayers. A ferromagnetic coupling and oscillations of coercivity Hc and residual magnetization Mr at 5 K have been observed as a function of Ag layer thickness. The observed residual stresses in NiFe layers which induce preferable magnetic easy-axes distributions along the strain direction are related with bulk spin-dependent scattering in individual layers for this type of giant magnetoresistive systems. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363823
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  • 10
    Electronic Resource
    Electronic Resource
    Study of the spin glass transition of amorphous FeZr alloys using small angle neutron scattering : 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. 6380-6382 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SANS experiments of an amorphous Fe90Zr10 alloy were carried out in the temperature region 20–300 K with and without the application of a magnetic field. The scattering versus temperature for different Q values (zero field cooled magnetization) shows two transitions at Tc=240 K and Tf=40 K. However, both transitions are not observed in magnetic field (2.6 kG) cooling down curves. By switching off the magnetic field and warming up the sample only the transition at Tf=40 K is observed. Application of a magnetic field at different temperatures in a zero field cooled sample reduces the scattering; the scattering returns to its initial value after switching off the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358273
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