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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic structure changes in amorphous RE-Fe"2 alloys as detected by ultrasonic measurements
    Amsterdam : Elsevier
    Physics Letters A 73 (1979), S. 58-62 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(79)90750-3
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  • 2
    Electronic Resource
    Electronic Resource
    Zero field damping capacity in (TbxDy1−x)Fey : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6213-6215 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Materials with a large capacity to dissipate mechanical energy are of interest for passive vibration damping. We have measured the zero-field damping capacity of the giant magnetostrictive terbium–dysprosium–iron compounds by quasistatic stress–strain hysteresis loops. The magnetization and strain of the samples were measured for increasing and decreasing compressive stresses, up to 50 MPa. The zero-field, room temperature damping capacity (ΔW/W) was calculated from the stress–strain loops and is plotted against maximum stress. The damping capacity maximum for the alloy with the nominal Terfenol-D composition occurs at 4.1 MPa with the value 1.75 which corresponds to Q−1=0.28. The damping is almost independent of stress in a multi-phase sample, (Tb0.6Dy0.4)Fe1.4, which contains both Laves phase and elemental rare earth. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362074
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  • 3
    Electronic Resource
    Electronic Resource
    Species present in metal-ammonia near the metal-insulator transition (1980)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 1206-1211 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100447a030
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of volume on magnetization in RxY1−xCo2 pseudobinaries (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5711-5711 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There is experimental1 and theoretical2 evidence that the cubic Laves phase compound YCo2, paramagnetic at its equilibrium volume, will become ferromagnetic with only a slight increase in volume. This volume sensitivity of Co-containing Laves phase compounds must therefore be considered when addressing the problem of the origin of the Co magnetic moment in pseudobinaries RxY1−xCo2, where R is any rare earth element with a net spin moment. In this paper we augment the itinerant picture describing the effect of the rare earth spin on the Co magnetization3 by taking into account the changes in volume brought about by the substitution of the rare earth for yttrium. We obtained the coefficients of the Landau expansion of the free energy by fitting the expansion to the calculated energy versus moment curves of YCo2 for various volumes.2 (These energies were calculated in Ref. 2 using the fixed-spin-moment method, within the local-spin-density approximation). Thus, for example, the substitution of Gd forces the formation of Co moments not only because of the Gd spin, but because of the increase in latttice constant, whereas the rare earths heavier than Tb have smaller lattice constants and are less likely to induce a moment on the Co sublattice. Results are presented for the critical fields necessary for magnetic ordering and for the Co magnetic moment as a function of the rare earth substitution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348939
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  • 5
    Electronic Resource
    Electronic Resource
    A phenomenological theory for the temperature dependence of the antiferromagnetic coupling in thin-film sandwiches and multilayers (abstract) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5879-5879 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent magnetoresistance experiments1,2 on Fe/Cr/Fe sandwiches and superlattices show that the critical magnetic field for saturation varies linearly with temperature from liquid helium to room temperature. The drop in critical field is as large as 30%, even though the reduction in Fe magnetization is negligible over this temperature range. In order to gain some insight into the physical origin of this softening of the critical field, which is a measure of the antiferromagnetic interlayer coupling, we have studied a phenomenological model of an Fe/Cr/Fe sandwich structure which consists of two Fe films coupled at their interface by an antiferromagnetic exchange at zero temperature. The Fe films themselves are ferromagnetic and subjected to an external field and uniaxial in-plane anisotropy. The Fe spins are confined to the film plane. The temperature dependence of the critical field, i.e., the field below which the spins in the two films deviate from the direction of the field, arises from fluctuations in these spin deviations, which are present for any temperature greater than zero. Using an approximation in which these fluctuations are treated classically, the critical field decreased linearly with temperature, with a coefficient that increases logarithmically with the transverse dimension of the films. Interpreting this length to be of the order of the grain size in polycrystalline films or a coverage terrace width in epitaxially grown material, we can directly relate the temperature variation of the antiferromagnetic interaction to film quality. The larger this dimension, the greater the decrease of the coupling with temperature; hence, "better'' films are expected to show weaker (or zero) coupling at room temperature. Conversely, the magnetization of the Fe films is not critically dependent on this dimension. Extension of the model to include spin-wave effects will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350117
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  • 6
    Electronic Resource
    Electronic Resource
    Stabilization of itinerant (band) magnetism in FeAl by Ga substitution for Al (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6889-6891 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Band structure calculations of FeGa1−xAlx have been performed, to further investigate the stability of ferromagnetism in FeAl. The Stoner parameter increases by about 20% at the FeGa end. This is also confirmed by our spin-polarized calculations. We conclude that Ga substitution for Al is likely to stabilize the elusive (or illusive) ferromagnetic state in FeAl. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1357838
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  • 7
    Electronic Resource
    Electronic Resource
    Predictions of magnetism in transition metal aluminides (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5872-5874 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Stoner Model has been used to investigate the stability of ferromagnetism in FeAl and the analogous series 3d transition metal aluminide compounds. Stoner factors, N(EF)I, were calculated from augmented plane wave (APW) electronic structure calculations based on local density approximation (LDA), using the Janak formalism. The Stoner criteria [N(EF)I〉1] predicts ferromagnetism in FeAl for lattice parameters larger than 5.44 a.u., which is less than the experimental lattice constant of 5.50 a.u., but greater than the APW–LDA minimum energy lattice constant. The Stoner factors for ordered transition metal aluminides in the B2 (CsCl) structure agree reasonably well with those calculated using a rigid band approach, starting from FeAl and shifting EF to simulate the remainder of the series. These Stoner factors predict ferromagnetism for CrAl and MnAl and, assuming the rigid band approximation, for FeAl alloyed with Cr and Mn to the level of Fe0.8Cr0.2Al and Fe0.6Mn0.4Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372551
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  • 8
    Electronic Resource
    Electronic Resource
    Atomic structure and magnetism of ordered and disordered Al0.5Fe0.5−xMnx alloys (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5181-5183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The equiatomic FeAl alloy has been modified by partial substitution of Mn for Fe, and its magnetic and structural properties investigated by neutron diffraction (ND), x-ray absorption fine structure (XAFS) spectroscopy, Mössbauer spectroscopy (MS), and SQUID magnetometry both for the ordered (B2) and disordered states. The unit cell volume is measured to increase linearly with Mn concentration. XAFS measurements indicate local structural displacements occur at the Mn sites in both ordered and disordered states that may act to frustrate long-range magnetic order (LRMO). Although MS and ND show no evidence of LRMO, SQUID magnetometry indicates an induced movement in the ordered state that increases with disorder but does not saturate at fields up to 5 T. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369117
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetoelastic effects in amorphous wires and amorphous ribbons with nonmagnetic thin-film coatings (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5405-5407 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the magnetomechanical coupling in amorphous 2605SC ribbons which have been coated by magnetron sputtering on one or both sides with copper films between 31 and 186 nm in thickness. Coating on one side produces an additional resonance mode which may be a coupling of an extensional and flexural mode. Coating on both sides greatly increases the anisotropy and reduces the coupling factor. Analysis indicates that these effects are due to stresses imposed by the coating on the ribbon and can be ameliorated by control of deposition parameters. In transverse-field annealed amorphous Fe77.5B15Si7.5 wire material we find a lower coercive force and lower values of applied fields required for saturation than in our ribbon investigations. This is probably due to a lower surface-to-volume ratio for the amorphous wire, i.e., surface defects play a lesser role in the wire geometry. We find a different magnetization process. Values of magnetomechanical coupling approach ribbon values. Saturation values of magnetostriction are equivalent. Values of the transverse anisotropy in the wire material are lower than what we have previously obtained in our ribbon material. We conclude that the amorphous wire will be a good sensor material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342384
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  • 10
    Electronic Resource
    Electronic Resource
    Long-range magnetic reconstruction of ferromagnetic films with diffused interfaces (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3649-3651 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two models of the magnetic structure of a ferromagnetic film deposited on a substrate are developed, with a view to explaining the reduced moment of Fe on GaAs. In the first, spin canting induced by antiferromagnetic exchange in the interface layer falls off rapidly in the interior of the ferromagnet, the characteristic distance being the size of the reconstructed magnetic unit cell in the interface. In the second, random anisotropy in the interface layer induces weakly pinned fluctuations of the magnetization which penetrate to a distance of order the domain wall width, approximately 100 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340672
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