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  • 1
    Online Resource
    Online Resource
    Applied Magnetism. (1993)
    Dordrecht :Springer Netherlands,
    Details
    Keywords: Magnetism. ; Electronic books.
    Description / Table of Contents: Proceedings of the NATO Advanced Study Institute, Erice, Sicily, Italy, July 1-12, 1992.
    Type of Medium: Online Resource
    Pages: 1 online resource (596 pages)
    Edition: 1st ed.
    ISBN: 9789401582636
    Series Statement: NATO Science Series E: Series ; v.253
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6502916
    DDC: 621.34
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Singular point detection in multidomain samples (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 323-333 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the present work the problem of singular point detection (SPD) is examined in the case of multidomain crystallites. As is known, a uniaxial polycrystalline ferromagnet displays a sharp peak in the second derivative of magnetization M with respect to magnetic field H versus H, located at the anisotropy field H=HA. This singularity was explained on the basis of the classical SPD theory which considers only single-domain crystallites. Here this matter is analyzed in the frame of the Néel phase theory and leads to an interpretation of the SPD peaks which seems to be more realistic. A theoretical study of the magnetization curve of a rotational ellipsoid single crystal clearly shows existence of a critical field Hc separating the multiphase from the single phase mode. The analysis of the magnetization curve of a polycrystalline material is based on the assumption that the main features of the SPD peaks are only determined by the discontinuity in the susceptibility at Hc. Contrary to the classical SPD theory, the shape of the grains is of fundamental importance. If the grains all have the same shape, the peak turns out to be a divergence; on the other hand, aggregates of crystallites having different demagnetizing factors show finite peaks closely resembling the experimental ones. The effects on the peak of crystallites' shapes and angular distribution have been investigated by means of numerical calculations. The validity of the present approach has also been tested by computer simulations on the basis of an extended Stoner–Wohlfarth model including the Néel phase theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353852
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Microstructural and magnetic properties of exchange-coupled Co/Fe multilayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6689-6691 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cobalt/iron multilayers with different layer thickness were electron beam evaporated in ultrahigh vacuum, keeping constant both the number of layers and the Co/Fe thickness ratio. Structural and magnetic properties are thoroughly investigated with different techniques. The multilayers have clean and sharp interfaces. All samples show single-phase magnetic behavior in the temperature range of 5–300 K, due to the strong exchange coupling between the layers. The room temperature hysteresis loops present a sharp switching at a field of ∼8 kA/m, followed by a residual hysteresis extending up to saturation, at fields of several tens of kA/m. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372809
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetization process in thin Ni sheets: Effect of cold-rolling and recrystallization annealing (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3880-3887 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Reversible and irreversible magnetization processes have been investigated in thin Ni sheets by means of flux-metric and alternating-gradient-force magnetometer techniques. Cold-rolled samples exhibit a rotation-dominated process at low fields, and the value of the associated susceptibility, related to the stress-induced and the magnetocrystalline anisotropies, can provide an estimate of the residual stress in the material. Reversible displacements of the domain walls come into play and combine with rotations in the annealed samples. A method is devised, by which domain-wall and rotational contributions to the reversible susceptibility can be singled out. The Rayleigh law always accounts for the behavior of hysteresis loops and losses at low fields, but rotations engender some peculiar evolution of the related parameters and their relationship with the coercive field. Magnetic softening by stress relief is assessed, as a whole, through Preisach analysis. It is found that the local stochastic coercive fields can be described by means of a Lorentzian distribution function, whose relative width is minimum in the cold-rolled material. By removing the internal stresses through recrystallization annealing, the contribution of grain boundaries and surface effects to coercivity is put in evidence, with the latter apparently posing the major restraints to domain-wall motion for grain sizes larger than the sheet thickness. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1347004
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  • 5
    Electronic Resource
    Electronic Resource
    Vibrating wire magnetic susceptometer (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3543-3552 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The growing interest in the field of nanoscale magnetic systems, especially regarding thin films and multilayers, emphasizes the need for sensitive measurement techniques. A new type of magnetic susceptometer, based on an alternative field gradient, is described. The mechanical resonating element is a long, thin, metallic wire. A complementary component generates a large local field gradient while keeping the field intensity as low as possible. The basic configuration of a typical instrument is presented and a general theoretical treatment is given concerning the magnetic force, the mechanical sensitivity of the vibrating system, and the vibration sensor. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147173
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of magnetic methods for the determination of texture of permanent magnets : 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. 6268-6270 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The singular point detection (SPD) technique as well as a least-mean-square procedure of fitting trial texture functions to demagnetization curves (DMC) were applied in order to determine the orientation density of the tetragonal axes of the Nd2Fe14B crystallites in sintered Nd-Fe-B magnets with different degrees of grain alignment. Both methods are less complicated than calculating the texture function from x-ray-diffraction data. The orientation densities obtained by both methods agree fairly. Analytically, they can be described as a Gaussian or a sum of cosine-power functions of the angle between the local tetragonal axis and the texture axis. This agreement is a test for the DMC method which can also be used for materials showing much larger anisotropy fields than the maximum available measuring field. The SPD and DMC methods can also be applied to measure the temperature dependence of the anisotropy field HA of the magnetic main phase in noncompletely textured polycrystalline materials. By means of the DMC method additionally the spontaneous polarization Js as well as the anisotropy constants K1 and K2 can be determined. As expected, the values of HA of our sintered Nd-Fe-B samples, measured up to 140 °C, are nearly independent of the degree of texture and are in agreement with those reported in literature. This confirms that SPD as well as DMC can be used to measure intrinsic magnetic properties for materials which can hardly be prepared as single crystals, such as interstitial compounds made by gas–solid reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358301
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  • 7
    Electronic Resource
    Electronic Resource
    Singular point detection of discontinuous magnetization processes (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1924-1934 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnetic crystals can show discontinuous jumps in the magnetization curve for certain combinations of the anisotropy constants. These are called first-order magnetization processes (FOMP) and have been recently observed in a large variety of compounds. We analyze the problem of how this singularity in the magnetization curve is transformed in the case of a polycrystalline specimen. The problem is the same as that of the singular point detection theory (SPD) that was originally concerned with the singularities of the anisotropy fields and with the way of enhancing them. SPD is now a widely used method for measuring anisotropy fields. In the present work it is demonstrated that SPD can be extended to FOMP, thus allowing extremely clear and accurate measurements of critical fields using polycrystalline specimens. This provides in principle a powerful method for deep investigations in the anisotropy properties of ferromagnetic and ferrimagnetic materials. In Sec. II we examine how the critical parameters of FOMP are modified when the magnetizing field is rotated out of symmetry directions. It is demonstrated that an additional transition is possible within certain conditions of anisotropy constants and field orientations (extraordinary FOMP). Section III is an extension of the Stoner–Wohlfarth model including anisotropy constants up to the sixth order (K1, K2, and K3). In Sec. IV we determine by analytical methods the order of derivative dnM/dHn at which the singularity becomes apparent. For FOMP of type P a discontinuity Δχ appears in the differential susceptibility, while FOMP of type A give rise to a discontinuity in the second derivative of the magnetization d2M/dH2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335999
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  • 8
    Electronic Resource
    Electronic Resource
    Theory of first order magnetization processes: Uniaxial anisotropy
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 20 (1980), S. 29-43 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(80)90522-3
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic characterization of Ca substituted Ba and Sr hexaferrites
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 20 (1980), S. 44-46 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(80)90523-5
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    High field first order transitions in PrCo"5"+/-"x: The role of the K"3 anisotropy constant
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 15-18 (1980), S. 561-562 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(80)90664-2
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    Paper (German National Licenses)
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