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  • 1
    Electronic Resource
    Electronic Resource
    Molecular Dynamics and Quantum Chemistry Study of a Proton-Coupled Electron Transfer Reaction (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 945-954 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100003a017
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of mechanical alloyed Nd–Fe–Ti compounds and their nitrides : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5525-5527 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Nd–Fe–Ti intermetallic compounds with a ThMn12 structure have been successfully prepared by mechanical alloying and then annealed. It has been found that the phase of the hexagonal TbCu7 structure is formed in Nd8Fe84Ti8 mechanical alloy powders annealed at temperatures ranging from 650 to 850 °C. With an increase in the annealing temperature Ta, the metastable TbCu7 structure transforms into a ThMn12 structure at Ta=900 °C. Consequently, the Curie temperature increases from 180 °C of TbCu7 structure at Ta=650 to 300 °C of ThMn12 structure at Ta=1050 °C. In the series of NdxFe92−xTi8 annealed at 960 °C for 30 min, it has been observed that the ThMn12 structure exists only over the range of compositions of 5≤x〈11, and the structure of the type Th2Zn17 is formed for x≥11. All the compounds are nitrited at 400 °C for 15 h, and the Curie temperatures are raised from 400 to 450 °C. The Nd9Fe83Ti8 powder, annealed at 960 °C for 30 min, and nitrided at 400 °C for 15 h, has a coercivity iHc=2.3 kOe. The low coercivity perhaps mainly results from an excessive growth of α-Fe grains due to the high annealing temperature necessary for forming the hard magnetic phase Nd(Fe,Ti)12Nδ. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362298
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  • 3
    Electronic Resource
    Electronic Resource
    Granular magnetoresistance ribbon material suitable for isotropic magnetic field transducers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4918-4920 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic granular CoCu alloy ribbons were prepared by the melt-spun method, and the structural, magnetotransport, magnetic properties, and the effects of annealing on these properties were studied by x-ray diffraction, vibrating sample magnetometer, and magnetoresistance (MR) measurements at room temperature. Giant magnetoresistance was observed over a broad range of Co concentrations with a maximum MR ratio of 7.8% (at x=0.20 and 500 °C annealing) under a magnetic field of 20 kOe at room temperature. It is found that the relationship between MR and magnetic field H depended strongly on the annealing temperature and a linear MR-H relation could be obtained at an optimum annealing condition. The MR ratio did not depend on the direction between H and electric current I. These features are very suitable for making isotropic magnetic field transducers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358442
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  • 4
    Electronic Resource
    Electronic Resource
    Anisotropic giant magnetoresistance induced by magnetoannealing in Fe-Ag granular films : 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. 6484-6486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of magnetoannealing on the giant magnetoresistance (GMR) in FexAg100−x granular films (X=15, 26, 29, 33, 37, and 60) were investigated. The thin films were annealed in a presence of magnetic field of 3 kOe at different temperatures of 300, 400, and 500 °C using various annealing times. It is found that the anisotropic GMR characteristics were developed when Fe-Ag granular thin films were annealed in the presence of a magnetic field. The anisotropic GMR characteristics of the thin films were closely related to the magnetic anisotropy developed along the field direction during magnetoannealing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358233
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallographic transformations of rapidly quenched Nd10Fe90−xTix (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4226-4231 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural transformations from amorphous, metastable-to-equilibrium phases during annealing treatment of rapidly quenched Nd10Fe90−xTix (x=0, 2, 4, 6, 8, and 10) alloys have been studied systematically. By means of ac initial susceptibility and x-ray diffraction, a CaCu5-type metastable phase was observed for 0≤x≤10 as the crystallization of the amorphous alloys occurs below 700 °C. The CaCu5-type structure transforms into a TbCu7-type one with increasing the annealing temperature (above 700 °C). These melt-spun alloys have different structures including Th2Zn17 type for 0≤x≤4 and TbCu7 and ThMn12 types for 6≤x≤10, when annealed at high temperature (above 1000 °C). Nitrogenation was carried out at 400 °C for 10 h. Both Nd(Fe,Ti)5 and its nitride are soft-magnetic phases, like Nd(Fe,Ti)7 and Nd2(Fe,Ti)17. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1290736
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Ga substitution for Fe on the structure and magnetic properties of Nd8.4Fe87.1−xGaxB4.5 (x=0–2.2) alloys prepared by mechanical alloying (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5335-5337 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of a partial substitution of Ga for Fe on the structure and magnetic properties of mechanically alloyed Nd8.4Fe87.1B4.5 were studied. With increasing Ga content, the magnetic properties of the nanocomposite magnets first improve, reach maxima at 1.1 at. % Ga, and then degrade. The addition of Ga helps to control the morphology, especially the grain sizes of both α-Fe and Nd2Fe14B. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373339
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of defects on magnetostrictive performance in Terfenol-D (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6286-6288 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A large remanent strain has been normally observed in free-standing float zone-grown Tb0.3Dy0.7Fe2 (Terfenol-D) following the application of magnetic field or compressive stress. Such a strain is considered to be composed of two parts, leading to reversible and irreversible domain contributions to the magnetostriction, in which the irreversible part corresponds to the magnetostrictive jump effect belonging to non-180° domain wall motion, and the reversible part contributes to the slower changes of magnetostriction. With no stress applied, the specimen shows a jump field of 21 and 53 Oe for 180° and non-180° domain wall motion, respectively. The jump field, distribution width and hysteresis field for non-180° domain wall motion are all increased with increasing stress, indicating complicated interactions between magnetic domains and defects. Stacking faults are found by electron microscopy to often act as domain-wall pinning centers, and scanning probe microscopy shows specific domain configurations are formed around excess rare earth, twin boundaries, and grain boundaries due to induced stresses and demagnetization effects. The influence of such interactions on magnetostrictive performance is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372681
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of the substitution of Cu or Nb for Fe on the structure and magnetic properties of Nd8Fe84Ti8 alloys prepared by mechanical alloying (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5287-5289 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of a partial substitution of Cu or Nb for Fe on the structure and magnetic properties of mechanically alloyed Nd8Fe84Ti8 alloys were studied. Compared with Nd8Fe84Ti8 alloys prepared under the same conditions, the temperature necessary for the formation of the Nd(Fe, Ti)12 phase decreases from 900 to 750 °C with the addition of 3 at. % Cu. The addition of Cu hinders the nitrogenation of the Nd(Fe, Ti)12 phase. The pretreatment of hydrogenation on the Cu-added alloys at 300 °C facilitates the formation of nitrides. With increasing annealing temperature, the intrinsic coercivity of the nitrides increases until it attains a maximum at 850 °C. The addition of Nb is harmful to the formation of the perfect Nd(Fe, Ti)12 phase. For the 3 at. % Nb-containing alloys, annealing at 960 °C makes a metastable phase Nd(Fe, Ti)7 be formed. The addition of Nb is unfavorable for the intrinsic coercivity and the maximum magnetic energy product of the nitrides. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373323
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  • 9
    Electronic Resource
    Electronic Resource
    Crystallographic transformations of rapidly quenched Sm10Fe90−xTix and magnetic properties of their nitrides (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 6170-6176 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sm10Fe90−xTix alloys (x=0, 1, 3, 4, 5, 6, 8, 10) were prepared by rapid quenching and sequent annealing. Structural transformations from amorphous, metastable-to-equilibrium phases, and magnetic properties of their nitrides were systematically investigated. A CaCu5-type metastable phase was formed for 0≤x≤10 as the crystallization of the amorphous alloys occurred below 700 °C. The CaCu5-type structure is transformed into a TbCu7-type one with increased annealing temperature (above 700 °C). These alloys have different structures including Th2Zn17 type for 0≤x≤3, TbCu7 type for 3〈x〈6, and ThMn12 type for 6≤x≤10, at high annealing temperatures (above 950 °C). Nitrogenation was carried out at 460 °C for 6 h. The best hard magnetic properties are obtained after nitriding for x=3. It gives iHc=17.6 kOe, 4πMr=7.7 kG, and (BH)max=6.8 MGOe for the TbCu7-type phase and iHc=8.6 kOe, 4πMr=8.4 kG, and (BH)max=10.2 MGOe for the CaCu5-type one. Although the coercivity of the CaCu5-type phase is lower than that of the TbCu7-type one, enhanced remanence of the former has been observed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366501
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetostriction and susceptibilities of twinned single crystals of Terfenol-D : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7276-7278 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements are presented of the dc magnetostriction, and both the ac and dc susceptibility along the three orthogonal axes of [112¯], [111], and [11¯0] from twinned single crystals of Terfenol-D as a function of varying compressive stress and magnetic field mutually applied along the [112¯] rod axis. The data are used in an attempt to analyze the magnetization processes occurring in such a specimen. The experimental results show clearly the two characteristics of the magnetization process corresponding to (i) the magnetostrictive "jump" effect, and (ii) the slow changes of magnetostriction occurring above the "jump." It is estimated that in stage (i) of the magnetization process, the domains aligned along the [111] axis by the applied stress rapidly and massively redistribute their moments both to the [111¯] direction closest to the applied field as well as to the [1¯11¯] and [11¯1¯] directions; and during stage (ii), the domains occupying the [1¯11¯] and [11¯1¯] directions redistribute to the [111¯] successively by non-180° domain-wall motion. However, two fine magnetization processes are found in the field range of the jump effect indicating that some domains must redistribute from the [111] to the [1¯11¯] and [11¯1¯] initially, then to the [111¯] even when the field is only increased in the initial stage (i). The nonzero susceptibilities measured along the [111] and [11¯0] suggest that both the volumes of parent and twin material as well as the probabilities for domain redistribution from one easy direction to the [1¯11¯] and [11¯1¯] might be different. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367617
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