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  • 2000-2004  (5)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Ga substitution on the magnetocrystalline anisotropy of arc-melted Sm2Co17−xGax (x=5,6) compounds (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 488-491 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Ga substitution on the magnetocrystalline anisotropy of Sm2Co17−xGax (x=5,6) compounds has been investigated by means of x-ray diffraction (XRD) and magnetic measurements. XRD patterns show that the samples studied here crystallize in the rhombohedral Th2Zn17-type structure. The Curie temperature for Sm2Co12Ga5 and Sm2Co11Ga6 is 367 and 166 K, respectively, according to thermal-magnetic curves. XRD measurement on the magnetically aligned sample shows that the room temperature easy magnetization direction of Sm2Co12Ga5 compound corresponds to the c axis. The spin-reorientation transition is observed at 32 K for Sm2Co11Ga6. The anisotropy constants K1 and K2 of Sm2Co17−xGax (x=5,6) were derived by fitting the magnetization recoil curve measured between 5 K and their Curie temperature. An anomalous jump in magnetization is found in the magnetization curve of Sm2Co12Ga5 compound. In order to investigate the temperature dependence of the critical field Hcrit in which the jumps of magnetization occur, hysteresis loops were measured in a field range of −90–90 kOe between 5 and 150 K. The critical field is found to shift rapidly to lower value with increasing temperature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1328063
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of additives on the structure and magnetic properties of 1:7 type Sm2Fe15Ga2C3 permanent magnets (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6618-6622 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of M(M=Zr, Cu, Nb) additives on the stability and magnetic properties of melt-spun nanocrystalline Sm2Fe15Ga2C3 ribbons with the 1:7-type structure has been investigated. The addition of 1 at. % of Zr or Nb was found to improve the thermal stability significantly, but the addition of Cu was found to decrease the thermal stability of the 1:7 metastable phase. After an appropriate heat treatment, M (Zr, Nb, or Cu)-containing samples exhibit better hard magnetic properties than the M-free sample. The intrinsic coercivity and maximum energy product were found to increase from 3.6 kOe and 59 kJ/m3 for the M-free sample to 4.8 kOe and 88 kJ/m3 for the Zr-containing one. The exchange interaction between the grains or the "exchange spring" behavior is studied according the Kneller and Hawig model and Henkel's plot. The enhancements of magnetic properties originate from the improvement of the intrinsic magnetic properties as well as the refinement of the microstructure. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289796
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  • 3
    Electronic Resource
    Electronic Resource
    Thickness dependence of magnetoelastic properties and of crystallization behavior in Fe–Tb–Dy/Fe and Fe–Tb–Dy/nanocrystalline Fe–Si–B–Nb–Cu multilayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2781-2786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe–Tb–Dy/Finemet™ and Fe–Tb–Dy/Fe multilayers have been prepared by ion beam sputtering on room temperature sapphire substrates (Finemet is a nanocrystalline Fe–Si–B–Nb–Cu magnetic alloy). After production, the Fe–Tb–Dy and the Finemet layers are amorphous, whereas the Fe layers are polycrystalline. Subsequent annealing leads to relaxation of the amorphous Fe–Tb–Dy layers in both cases and to crystallization of the Finemet layers for the Fe–Tb–Dy/Finemet multilayers. In this regime, the properties of the multilayers can be well described by a mixture rule of the two perfectly coupled components. In an optimum thickness range for both layers, they show very soft magnetic properties and high magnetoelasticity. Furthermore, it has been observed that crystallization of the Fe–Tb–Dy layers within the multilayer is hindered by interface stabilization as recently predicted in U. Herr, H. Geisler, H. Ippach, and K. Samwer, Phys. Rev. B 59, 13719 (1999). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287775
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  • 4
    Electronic Resource
    Electronic Resource
    Melt-spun precipitation-hardened Sm2(Co, Cu, Fe, Zr)17 magnets with abnormal temperature dependence of coercivity (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1054-1056 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rapidly quenched Sm(CobalCu0.08Fe0.22Zr0.02)8.5 (Cu-/Fe-rich) and Sm(CobalCu0.05Fe0.10Zr0.03)8.5 (Cu-/Fe-poor) ribbons have been prepared by means of the melt-spinning technique. By applying an appropriate annealing procedure a microstructure similar to that of sintered magnets can be obtained. The energy dispersive x-ray microanalysis of the compositional dependence near the cell boundaries suggests a model for the profile of the crystal anisotropy constants responsible for the magnetic hardening. The Cu-/Fe-rich alloy shows a normal temperature dependence of coercivity with a negative temperature coefficient, but the Cu-/Fe-poor ribbons show a positive temperature coefficient in the temperature range from 400–700 K. The different temperature coefficients are discussed in terms of a pinning model. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125936
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  • 5
    Electronic Resource
    Electronic Resource
    High-performance permanent magnets (2000)
    Springer
    Naturwissenschaften 87 (2000), S. 423-438 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract  High-performance permanent magnets (pms) are based on compounds with outstanding intrinsic magnetic properties as well as on optimized microstructures and alloy compositions. The most powerful pm materials at present are RE–TM intermetallic alloys which derive their exceptional magnetic properties from the favourable combination of rare earth metals (RE=Nd, Pr, Sm) with transition metals (TM=Fe, Co), in particular magnets based on (Nd,Pr)2Fe14B and Sm2(Co,Cu,Fe,Zr)17. Their development during the last 20 years has involved a dramatic improvement in their performance by a factor of 〉15 compared with conventional ferrite pms therefore contributing positively to the ever-increasing demand for pms in many (including new) application fields, to the extent that RE–TM pms now account for nearly half of the worldwide market. This review article first gives a brief introduction to the basics of ferromagnetism to confer an insight into the variety of (permanent) magnets, their manufacture and application fields. We then examine the rather complex relationship between the microstructure and the magnetic properties for the two highest-performance and most promising pm materials mentioned. By using numerical micromagnetic simulations on the basis of the Finite Element technique the correlation can be quantitatively predicted, thus providing a powerful tool for the further development of optimized high-performance pms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050755
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