Library

X
Your search history is empty.
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic neutron scattering in single crystal Bi2CuO4 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6448-6450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spin-wave excitations and the critical behavior of the sublattice magnetization in Bi2CuO4 have been investigated by means of neutron scattering. The three-dimensional character of the antiferromagnetic ordering with propagation vector K=(1,0,0) below TN=45.83(8) K is reflected by the value of the critical exponent β=0.352(3). The spin-wave excitations have been measured along the symmetry directions [100] and [001]. The spin-wave dispersion is found to split into two branches with energy gaps Δ1=2.1 meV and Δ2=3.4 meV at the zone center. The data analysis is based on an S=1/2 spin Hamiltonian of tetragonal symmetry with anisotropic bilinear exchange including a four-site exchange interaction term.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352629
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Distribution of magnetic moments in Co/Pt and Co/Pt/Ir/Pt multilayers detected by magnetic x-ray absorption : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6430-6432 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Circular magnetic x-ray dichroism (CMXD) was observed at the Pt and Ir L2,3 edges in the multilayered structures 25⋅(4 A(ring) Co+30 A(ring) Pt) and 25⋅(4 A(ring) Co+11 A(ring) Pt+8 A(ring) Ir+11 A(ring) Pt). The samples were prepared by sputtering and show a large perpendicular anisotropy. The magnetic absorption at the Pt and Ir L2,3 edges was measured in an external magnetic field of 0.15 T perpendicular to the surface. The results indicate a significant spin polarization of the Pt and Ir layers. By comparison with the corresponding CMXD signals of Pt and Ir impurities in a ferromagnetic iron host we estimated the local spin and orbital moments. The results show that the innermost three monolayers in both systems couple ferromagnetically to the Co layers with an average magnetic moment of about 0.01 μB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352622
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Magnetic phase transitions in α-CeS2 : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct−Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4630-4632 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Physical properties of platelike single crystals (size up to 3×0.2×2 mm3, b axis perpendicular to the plate) of α-CeS2 (monoclinic, space group P21/c) have been studied and magnetic ordering was found below 7 K. Specific heat Cp(T) has a λ-type anomaly at TN=6.7 K with entropy sm=0.94R ln 2 and an additional maximum at 6.0 K (S'm ∼ 0.02R ln 2). Crystal-field splitting of the 2F5/2 state of Ce3+ into three doublets with energy levels 0, 230, and 415 cm−1 was obtained from Cp(T). Magnetic properties were studied using SQUID and vibrating sample magnetometer. Paramagnetic susceptibility obeys a Curie–Weiss law with anisotropic effective magnetic moment and Curie–Weiss temperature: P=2.1 μB, aitch-theta=+7.8 K for b axis and P=1.5 μB, aitch-theta=−0.8 K in directions perpendicular to the b axis. Complicated magnetic behavior is observed in low fields (0.1–100 Oe) below TN (strong dependence of dc susceptibility on thermomagnetic prehistory, cooling rate and applied field, remanent and memory phenomena). Magnetization curves at 4.2 K show a sharp metamagnetic transition at Hc=5 kOe for a field along the b axis and linear dependence M(H) up to 30 kOe for the perpendicular direction. Neutron scattering experiments are in progress to establish details of the magnetic structure and the crystal-field splitting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348304
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    SPEXAFS at the L2,3 edges of Eu3Fe5O12, Gd and Tb metal and the alloy HoGd (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5347-5347 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Systematic studies of the magnetic or spin-dependent EXAFS (SPEXAFS) were performed at the L2/3 edges of Eu3Fe5O12, Gd and Tb metal and the alloy Ho20Gd80. The magnetic absorption exhibits distinct EXAFS structure, more pronounced than the nonmagnetic EXAFS. The Fourier transform of the Eu L2/3-edges SPEXAFS spectra, which are measured with an accuracy of less than 5×10−5, show a complete disappearance of the oxygen peak. This allows an identification of the positions of the magnetic neighbors for a significantly longer range as it is possible by using the conventional EXAFS profile. Studies of the alloy Ho20Gd80 at the L2/3 edges of both components, which show no significant differences in the polarization averaged EXAFS, indicate an essential influence of the spin structure at the absorbing atom on the magnetic EXAFS spectrum. At the L3 edge of Gd and Tb metal (both of hcp structure) we found similar structures in the conventional as well as in the magnetic EXAFS. The data are interpreted in terms of the sensibility of the SPEXAFS on the angular momentum of the absorbing and neighboring atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353727
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Magnetic circular x-ray dichroism studies of Fe/Tb multilayers : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6910-6912 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The local magnetic structure of TbFe multilayers with various layer thicknesses of Tb (26 A(ring)) and Fe (10, 20, 30 and 35 A(ring)) has been investigated by circular magnetic x-ray dichroism (CMXD) studies. From the dichroic signal at the L3 edge both the local magnetic Tb moment and the anisotropic behavior of the Tb compound could be deduced. The magnetic spectra at the Tb L2 edge and the Fe K edge, which are known to be sensitive to the local chemical environment, have been used to obtain information on the binding characters of the magnetized atoms in the various TbFe compositions. Significant deviations of the CMXD spectra compared to the corresponding spectra in the pure Fe and Tb metals have been observed. This indicates significant contributions to the magnetism from an interface region, whose chemical structure resembles strongly those of the intermetallic TbFe2 compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352431
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Novel high mobility Ga0.51In0.49P/GaAs modulation-doped field-effect transistor structures grown using a gas source molecular beam epitaxy (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4632-4634 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A standard Ga0.51In0.49P/GaAs modulation-doped field-effect transistor (MODFET) structure and a novel Ga0.51In0.49P/GaAs MODFET structure where the Ga0.51In0.49P spacer layer was replaced by an undoped Al0.3Ga0.7As layer were grown using a gas source molecular beam epitaxy. The Hall mobility of the novel MODFET's structures are 6600 and 36 400 cm2/V s at room temperature and 77 K, respectively, which are more than twice as high as that in the ordinary Ga0.51In0.49P/GaAs MODFETs structure. The mobility is attributed to better carrier confinement and smoother heterointerface. Furthermore, it is found that both ordinary and novel MODFET's structures have small photo-persistant conductivity effects at low temperatures and that the FETs made in these materials had no threshold voltage shift at low temperatures after illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350768
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Spin-dependent x-ray absorption in Co/Pt multilayers : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5655-5657 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin-dependent absorption spectroscopy or circular magnetic x-ray dichroism studies at the L2,3 edges of 5d atoms in ferromagnetic hosts have been used to investigate the spin-density distribution of the empty d-projected states and thus the local magnetic moment of the absorbing 5d atoms. This method was applied to study the average polarization of the Pt atom in Co/Pt multilayers with different modulation lengths. The spin-dependent absorption profiles for vapor-deposited [25(4 A(ring) Co+x A(ring) Pt), x=9, 16, 23, 30, 40] multilayers indicate a significant average Pt polarization decreasing with the layer thickness. The experimental results are discussed in comparison with spin-polarized relativistic band-structure calculations (linear muffin-tin-orbital calculations).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347926
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Investigation of the systematics of CMXD at the L2,3 edges in (RE)2Co17 : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct−Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6144-6146 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed systematic investigations of the circular magnetic x-ray dichroism, i.e., the spin-dependent absorption of circularly polarized x rays at the L2,3 edges of the 4f elements in the compound (RE)2Co17. In all systems significant CMXD signals with relative large amplitudes of some percent have been found. It is expected, that the spin-dependent absorption profile reflects the spin-density of d-like unoccupied states at the Fermi level and thus contains information on the orientation of the 4f moment. The ratio of the CMXD signal at the L2 and L3 edges depends strongly on the angular momentum of the 4f core and indicates in case of Ce2Co17, that the 4f electrons are of itinerant character with almost quenched angular momentum, as theoretically expected for similar Ce systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348785
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Magnetic scattering of circularly polarized x rays (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5346-5346 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interference of charge and magnetic scattering from ferromagnetic targets leads in case of circularly polarized x rays to a relative difference (flipping ratio) of the Bragg peak intensity in the order of 10−3, when the magnetization aligned in the scattering plane is reversed (spin-dependent scattering). We have measured the spin-dependent scattering in Fe, Gd, and Tb polycrystalline metallic foils using circularly polarized synchrotron radiation. From the data, magnetic form factors have been deduced. As demonstrated for Gd and Tb, from the flipping ratios the orbital and spin contribution can be directly separated by varying the angle between the scattering vector and the sample magnetization. Spin-dependent resonance scattering has been studied at the K edge of a Ni single crystal. A significant enhancement of the magnetic scattering amplitude compared to the magnetic resonance scattering of linearly polarized light and sample magnetization perpendicular to the scattering plane has been observed. A strongly increased nonresonant magnetic scattering with opposite sign compared to the resonant magnetic effects is observed in the preedge energy region below −10 eV with respect to the K-absorption onset. The applicability of magnetic scattering using circularly polarized synchrotron radiation for the investigation of ferromagnetic media especially in view of its complementarity to neutron studies is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353725
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of the circular magnetic x-ray dichroism in the Invar alloy Fe72Pt28 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6063-6065 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The method of spin-dependent absorption has been used to examine the temperature dependence of the circular magnetic x-ray dichroism (CMXD) of the (disordered) Invar alloy fcc Fe72Pt28. At the Fe K edge the difference of the transmission for the reversed magnetization direction was determined with an accuracy of 10−5. By comparing the dichroic effects at 110 and at 410 K evidence was found for a temperature-dependent change of the magnetic absorption profile different from the pure amplitude reduction due to the reduced magnetization. It indicates a change of the spin splitting in the low-lying unoccupied p states. The polarization-averaged absorption spectrum shows also a small variation between 4 and 11 eV above the threshold indicating that the p-like electron density drops when the sample is heated. The experimental CMXD profiles are compared with spin-polarized band-structure calculations for ordered Fe3Pt and discussed within the frame of the model of high-spin–low-spin transitions in the Invar regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353470
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...