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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of Dy-Lu alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6592-6594 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Although many binary heavy rare-earth alloy systems have been studied extensively, there has been little work reported on the Dy-Lu system. The properties of single-crystal DyxLu1−x films grown by molecular beam epitaxy are reported. SQUID magnetometer and neutron diffraction measurements on samples with x=0.4, 0.5, and 0.6 show that the samples order helimagnetically with Néel temperatures of TN=90, 105, and 120 K, respectively. The helical turn angle was mapped as a function of temperature for each of the three alloys. Magnetic x-ray scattering, the first in an alloy, was observed at the (002)± positions at 15 and 60 K in the x=0.4 sample using resonant exchange scattering of synchrotron radiation at the Dy LIII edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356905
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  • 2
    Electronic Resource
    Electronic Resource
    Occurrence of long-range helical spin ordering in Dy-Y multilayers (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4043-4048 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic ordering of highly perfect single-crystal multilayer films of alternate layers of magnetic Dy and nonmagnetic Y prepared by molecular beam epitaxy has been studied by neutron diffraction. Results on a series of films with Dy thicknesses of approximately 16 atomic planes (≈45 A(ring)) and Y thicknesses ranging from 10 to 22 planes have confirmed the existence of long-range helimagnetic ordering of the Dy 4f spins which is propagated through the intervening Y layers in phase coherence. The propagation vectors in both Dy and Y layers have been calculated from the wave vector of the magnetic satellites and the intensity of the bilayer harmonics. The propagation vector for Dy decreases continuously with temperature, while that in the Y is temperature independent and equal to 0.31 A(ring)−1. The nature of the ordering and the noninteger multiple of π for the phase change of the propagation wave vector across the Y, suggests that the mechanism of long-range coupling is a conduction band spin-density wave in both Y and Dy stabilized by the 4f spins of the Dy. No intrinsic ferromagnetic transition is observed due to the clamping effect of the Y layers on the Dy magnetostriction. The application of a field along basal plane directions destroys the helical order and produces a ferromagnetic state with all spins aligned along the field direction. The moment in the induced ferromagnetic state is 10 μB, while that calculated for the zero-field helical state ranges from 7.5μB to 9.5μB for different samples, suggesting a possible static disorder of some Dy spins superimposed on the intrinsic long-range helical state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338549
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  • 3
    Electronic Resource
    Electronic Resource
    Reentrant spin glass behavior in layered manganite La1.2Sr1.8Mn2O7 single crystals (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 6307-6311 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a detailed study of ac/dc magnetization and longitudinal/transverse transport properties of La1.2Sr1.8Mn2O7 single crystals below Tc=118 K. We find that the resistivity minimum at 40 K is related to the reentrant spin glass phase at the same temperature, accompanied by additional anomalous Hall effects. The carrier concentration from the ordinary Hall effects remains constant during the transition and is close to the nominal doping level (0.4 holes/Mn). The spin glass behavior comes from the competition between ferromagnetic double exchange and antiferromagnetic superexchange interactions, which leads to phase separation, i.e., a mixture of ferromagnetic and antiferromagnetic clusters, representing the canted antiferromagnetic state. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1419260
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetothermopower of cobalt/copper multilayers with gradient perpendicular to planes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4855-4857 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetothermopower and magnetoresistance of two copper/cobalt multilayers grown on grooved indium phosphide were measured between 100 K and 295 K. One sample was deposited at an angle onto a grooved substrate such that transport properties are measured between layers rather than parallel to them (CPP); the other was deposited perpendicular to the substrate, so that the transport properties are measured at an angle to the planes (CAP). The data show the magnetothermopower to vary inversely with the resistivity, as predicted by the Mott formula if the magnetoresistance is determined by the ratio α of majority to minority densities of states at the Fermi energy EF in the magnetic metal. Using this result, we can collapse the thermopower data at various temperatures to find that α′/α is 0.6 eV−1 for the CPP sample and 0.7 eV−1 for the CAP sample, where α′≡(∂α/∂E)EF. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373181
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic heat capacity in lanthanum manganite single crystals (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5825-5827 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The heat capacity of single crystal La0.7D0.3MnO3, where D=Ca, Sr, has been measured through the Curie point in fields up to 70 kOe. The magnetic contribution of the Ca sample exhibits a sharp heat capacity peak at TC(similar, equals)218 K in zero field. The peak broadens and decreases in height with increasing field but, unlike an ordinary ferromagnet, the peak shifts substantially in temperature. As a consequence, the heat capacity data cannot be collapsed into a single scaling function. These features indicate that the transition is not an ordinary second-order ferromagnetic transition. Preliminary heat capacity data from the Sr-doped single crystal, with TC(similar, equals)360 K, do not exhibit the same shift in peak position with applied field. We attribute the difference in behavior between Ca- and Sr-doped samples to a change in the nature of the phase transition as TC lowers. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372535
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  • 6
    Electronic Resource
    Electronic Resource
    Hall effect of La2/3(Ca,Pb)1/3MnO3 single crystals (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5573-5575 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Hall resistivity ρxy of a La2/3(Ca,Pb)1/3MnO3 single crystal has been measured as a function of temperature and field. The overall behavior is similar to that observed previously in thin-film samples. At 5 K, ρxy is positive and linear in field, indicating that the anomalous contribution is negligible. However, the slope is small and, if a free carrier, single band model were used, the carrier density would be 2.4 holes per unit cell, even larger than the 0.85–1.9 holes per cell that have been reported using thin-film data and far larger than the 0.33 holes per cell expected from the doping level. As the temperature is increased, a strong, negative contribution to ρxy appears, due to the anomalous contribution to the Hall effect. Making use of a detailed measurement of the magnetization M(B,T), we separate the ordinary (∝B) and anomalous (∝M) contributions. The anomalous contribution is negative and proportional to the zero-field resistivity ρxx below TC, indicating that magnetic skew scattering is the dominant mechanism in the metallic ferromagnetic regime. Far above TC, ρxy shows a negative slope, and is to be associated with the hopping of small polarons. Above TC, the Hall mobility is field independent despite the changes in ρxx and nonlinear ρxy. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369898
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetoelasticity and structure of Er/Y superlattices (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3461-3463 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystal superlattices (Erx/Yy) have been grown by molecular-beam epitaxy techniques with the c axis perpendicular to the growth plane. The magnetic structure has been determined by neutron diffraction, and demonstrates long-range order of the c-axis Ising-like Er moments extending through the "magnetically dead'' Y layers (TN superlattice ≈TN bulk), as was found for the X-Y superlattices (Dyx /Yy). The Er c-axis effective turn angles for x=13, 23, and 32 are all nearly temperature independent at ω≈2π/7, the high-temperature lock-in value in bulk Er (although it is difficult to determine if a lock-in transition occurs), with the ferromagnetic transition completely suppressed. This results from the fact that the magneto-elastic energy density, which causes ω to decrease in the bulk, is considerably reduced in the superlattices. As in bulk Er, the high-temperature sinusoidally modulated phase "squares up'' upon reducing the temperature, and this squaring is enhanced at the basal-plane ordering transition, which is at roughly half the temperature found in bulk Er. The basal-plane turn angle tends towards the low-temperature value of bulk Er, ω≈π/4, which is surprisingly different from the c axis ω.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340766
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  • 8
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of an amorphous magnet (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3647-3649 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystallization of an amorphous Fe-Ni-P alloy during isothermal annealing has been studied using a method that relies on the magnetism of the crystalline product. By rescaling the time axis for each annealing temperature, the data fall on a universal curve of the Johnson–Mehl–Avrami form, with parameters indicative of linear growth of a fixed number of crystallites. The time scaling parameter can be fitted to a Vogel–Fulcher or a Williams–Landel–Ferry temperature dependence, suggesting that dynamic processes in the glass phase are the rate-limiting steps in crystallization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338703
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  • 9
    Electronic Resource
    Electronic Resource
    The spin-glass transition in three dimensions: Is it understood? (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4228-4231 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The current state of understanding of the spin-glass transition in three-dimensional systems was the topic of a symposium at the 31st Conference on Magnetism and Magnetic Materials. Panelists were A. J. Bray, J. Mydosh, A. Ogielski, J. Souletie, and A. Zippelius. M. B. Salamon moderated and prepared this summary. The consensus is that there is, indeed, a phase transition in three-dimensional Ising spin glasses, that its properties are dominated by strong critical slowing down, and that the scaling behavior of the nonlinear susceptibility provides the best indicator of its presence. The ordered phase is still not understood in the view of the panel, and evidence seems against interpretations based on modifications of mean-field solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338483
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic characterization of Er/Y superlattices (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3458-3460 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Molecular-beam epitaxy techniques have been used to prepare coherent, crystalline superlattices of erbium and yttrium. Magnetometer measurements indicate that the transition temperatures for the superlattices are significantly lower than those for bulk erbium. The first-order transition to a conical ferromagnetic state observed in Er is suppressed. The c-axis modulated phase is stable in c-axis fields up to 17 kOe, while the field dependence of the basal-plane moments differs little from bulk Er. These results suggest that the magnetoelastic energy has been altered in the superlattice samples due to lattice clamping to the substrate and at the interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340765
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