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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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of monodomain Nd-Fe-B-C nanoparticles : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5293-5295 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanoparticles of Nd-Fe-B-C with their crystal structure similar to the Nd2Fe14B phase were generated in a carbon arc. With an average diameter of less than 40 nm, they are monodomain. They have a smaller room-temperature coercivity than would be predicted from the bulk magnetocrystalline anisotropy. However, their coercivity is greater than was previously observed in particles 〈5 μm prepared by spark erosion. While the carbon arc process is useful for making small carbon-coated particles which resist oxidation, here dispersion of excess Nd in the carbon matrix results in a significant paramagnetic signal. The dc demagnetization curves enable the paramagnetic and ferromagnetic contributions to be distinguished. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361355
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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
    Effect of Ga addition to the Pr3(Fe,Co,Ti)29 (3:29) system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5275-5277 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline Ga-substituted Pr3(Fe1−xCox)27.5Ti1.5 (x=0.3,0.4) magnets have been studied for high temperature permanent magnets. Using x-ray diffraction, in addition to the majority 3:29 phase, the presence of the minority 2:17, 1:12 and α-Fe phases was observed. An increase in TC was observed with increasing Co content. A TC as high as 572 °C was observed for x=0.4. Magnetic measurements at room temperature showed an increase in the anisotropy field HA with increasing Co and Ga concentration, while the coercivity decreased. Scanning electron microscopy and energy dispersive x-ray analysis measurements indicated the 3:29 phase as the majority phase. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373319
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of MnBi1−xRx (R=rare earth) systems (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6040-6042 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: MnBi crystallizes in a NiAs-type hexagonal crystal structure, exhibits a high uniaxial anisotropy, and is potentially useful as a permanent magnet material. We have examined the effect of partial substitution of Bi with rare earth elements on the magnetic properties of MnBi. MnBi1−xRx (R=Nd, Dy) were prepared by mechanically alloying powders of the constituent elements at liquid nitrogen temperature followed by heat treatment. X-ray diffraction and magnetic measurements were performed on powder samples to characterize the samples. We found that in MnBi1−xNdx, coercivity (at room temperature) increases from 0.7 kOe to 6.6 kOe for x=0.0 and 0.3, respectively. In MnBi1−xDyx the coercivity increases from 0.7 kOe to 7.9 kOe for x=0.0 and 0.3. The increase in coercivity may be in part due to the increase in the crystal field anisotropy as Nd or Dy is introduced and in part due to the finer particle size. A magnet made from MnBi shows coercivity of ∼17 kOe. A very fine particle size is considered to be the reason for this high coercivity. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372605
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic properties of HITPERM (Fe, Co)88Zr7B4Cu1 magnets (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4421-4423 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new class of nanocrystalline alloys with composition Fe44Co44Zr7B4Cu1 has been developed. This and similar alloys of general composition (Fe, Co)–M–B–Cu (where M=Zr, Hf, Nb, etc.) have been named HITPERM. They offer large magnetic inductions and excellent soft magnetic properties at elevated temperatures. Thermomagnetic properties, permeability, and frequency dependent losses are described in this report. These alloys exhibit high magnetization that persists to the α→γ phase transformation at 980 °C. Alternating current permeability experiments reveal a high permeability at 2 kHz with a loss value of 1 W/g at Bs=10 kG and f=10 kHz. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369804
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of RCo7−xZrx (R=Pr or Er, x=0–0.8) (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5663-5665 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alloys of composition RCo7−xZrx (R=Pr or Er and x=0−0.8) were synthesized and characterized in the temperature range of 10–1273 K in fields up to 5 T. As with the SmCo7−xZrx system studied earlier in our laboratory, the effects of Zr doping on the stability of the TbCu7 phase and the increase in the anisotropy field HA are also observed in the systems of PrCo7−xZrx and ErCo7−xZrx. Nearly single phase TbCu7 materials were formed in as-cast alloys when x=0.1–0.2. In the case of R=Pr, HA changes from almost planar for x=0 to uniaxial with Ha∼100 kOe for x≥0.2 at room temperature (RT). In the case of R=Er, HA for the x=0.1 composition is almost two times larger than that of the Zr-free alloys, which shows strong uniaxial anisotropy at both RT and 10 K. Spin reorientation behavior (when R=Pr) and R–M antiparallel coupling (when R=Er) were also observed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369833
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