Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • 1990-1994  (17)
  • 1985-1989  (4)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    The variation of anisotropy and magnetization orientation with temperature in Tb/Fe multilayers : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6907-6909 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On the basis of the co-effect of the crystal field with a random distribution and the molecular field and using anisotropic static magnetic couplings, we calculated the polar angle aitch-theta of the magnetic moment in 15×(26 A(ring) Tb/40 A(ring) Fe)+40 A(ring) Fe multilayers as function of temperature from 4.2 to 300 K, which agrees well with experiment. As a result of the calculation, the width of interface mixing layer and the coefficient of the crystal field are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352430
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties of Fe/Tb multilayers : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6206-6208 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multilayered Fe/Tb samples were prepared under ultrahigh vacuum conditions (p〈10−9 mbar) on kapton substrates. A total of four different samples were prepared. Three of them correspond to a series where the Tb thickness is constant at 26 A(ring) and Fe varies from 10 to 30 A(ring). The fourth one is the first of a new series where Tb is 7 A(ring) thick and Fe 40 A(ring). The samples were investigated by means of SQUID magnetometry and Mössbauer spectroscopy. All samples show perpendicular magnetic anisotropy at low temperature (4.2 K), but only two of them are able to show it at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349996
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Interface alloying and magnetic properties of Fe/Rh multilayers : 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. 6528-6530 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rh(20 A(ring))/57Fe(tFe) multilayers with Fe thicknesses tFe of 2, 5, 10, and 15 A(ring) prepared by alternate evaporation in UHV have been investigated by x-ray diffraction (XRD), Mössbauer spectroscopy, and SQUID magnetometry. First- and second-order superstructure Bragg peaks (but no higher-order peaks) in small-angle XRD patterns suggest some compositional modulation. Mössbauer spectra taken at 4.2 K are characterized by a distribution P(Bhf) of hyperfine fields Bhf. Peaks observed in the P(Bhf) curves near 17 and 35 T are assigned to an fcc-R(underbar)h(underbar)Fe interface alloy (∼7–24 at. % Fe) with spin-glasslike properties and to a disordered ferromagnetic bcc-F(underbar)e(underbar)Rh alloy (∼96 at. % Fe), respectively. The magnetic transition temperature of the fcc alloy was found to be 23 and 45 K for tFe=2 and 5 A(ring), respectively, and Bhf follows a T3/2 law. For tFe=2 A(ring), spin-glasslike behavior was observed by magnetometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358213
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Correlation of magneto-volume effects and local properties of the Fe2Ti-laves phase (abstract) : 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. 6912-6912 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magneto-volume effects have been calculated and shown to exist in Fe2Ti alloys. Since Mössbauer spectroscopy provides insight into local magnetic properties we have performed such measurements in the temperature range 4.2 K〈T〈800 in Bext=0 and ≠0 on Fe2+xTi1−x powder samples with x=−0.05 to +0.1. The spectra of Fe2Ti at 4.2 K show two subspectra, one belonging to the antiferromagnetically coupled 6h sites, and the other one to the paramagnetic 2a sites, in agreement with Ref. . A detailed analysis shows that the electric field gradient of the 6h sites changes in sign and value when going from the antiferromagnetic to the paramagnetic state at 310 K. Moreover, the isomer shift values of the two sites are found to be different at 4.2 K, while they are equal above 310 K. Both changes suggest a change in the local electronic band structure between the paramagnetic and antiferromagnetic states. An increase of the linewidth is observable in the temperature region of 200 K〈T〈310 K that could be caused by a distribution of hyperfine fields on the 6h sites or by spin fluctuations during the lifetime of the excited state of the Mössbauer nucleus. For x(approximately-greater-than)0 and 4.2 K, an additional magnetically split subspectrum appears that is associated with 6h sites and neighboring Fe antisite atoms. For x〈0 the spectra are similar to those of Fe2Ti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Exchange coupling, interface structure, and perpendicular magnetic anisotropy in Tb/Fe multilayers (abstract) : 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. 6293-6293 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tb/Fe multilayer films are known to show perpendicular magnetic anisotropy (PMA), which is interesting for potential applications in magneto-optical data storage. We demonstrate by using 57Fe Mössbauer probe layers and x-ray diffraction that part of the Tb-deposited-on-Fe (Tb/Fe) interface remains chemically sharp and crystalline bcc Fe. This part is associated with an unexpectedly strong antiferromagnetic exchange coupling of the Fe to the Tb layers. We find by using both conventional and circularly polarized radiation that part of the interface and core bcc Fe but none of the amorphous Fe is strongly coupled to Tb. This behavior is qualitatively explained by a structural model including regions with a sharp Tb/bcc-Fe interface, where PMA originates from Tb ions that experience the broken symmetry of the crystal electric field at the interface. The extrapolated isomer shift at T=0 K of the amorphous phase located at the Fe-deposited-on-Tb (Fe/Tb) interface was found to be different from that of the amorphous phase located at the Tb/Fe interface, suggesting a different amorphous structure at both interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358312
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The magnetic transition in Fe-substituted hexagonal β-Al9SiMn3 phase (1990)
    Springer
    Hyperfine interactions 54 (1990), S. 473-478 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently we have studies β-Al9Si(Mn1−x Fe x )3 using Mössbauer effect spectroscopy withx=0.28 and discovered a new transition at about 80 K. Neutron diffraction studies down to low temperatures reveal no structural changes, so that this transition at 80 K is indeed of magnetic origin. The magnetic susceptibility shows a small maximum near this temperature superimposed on a large Curie-like background. In addition to this transition, the Curie-like background shows a cusp near 4 K. We thus infer a magnetic double transition in this disordered alloy. These magnetic transitions have been followed to lower Fe concentrations (x=0.10 and 0.20) by both Mössbauer spectroscopy (T c ) and by magnetic susceptibility (T g). It is found thatT C decreases rapidly with decreasing Fe concentration, whileT g remains relatively constant. The saturation hyperfine fieldB hf(0) decreases rapidly with decreasingx, indicating that the Fe atoms loose their magnetic moments in the limit of infinite dilution, and the important role played by Fe−Fe nearest neighbors in determining the magnetic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396074
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Sign determination of the57Fe electric field gradient in Al-based crystals and icosahedral quasicrystals (1988)
    Springer
    Hyperfine interactions 42 (1988), S. 943-946 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The icosahedral quasicrystals i-AlMn isomorphically suostituted by 28 at.% Fe or by (CrFe) are studied for the first time by in-field Mössbauer spectroscopy (MS) in order to determine the sign and asymmetry parameter of the dominant EFG term. In addition, the orthorhombic o-Al(MnFe) and cubic α- and hexagonal β-Al(MnFe)Si phases are studied. We show that previous MS results are inadequate to determine if there are two sites in the i-AlMn structure in the ratio of the golden number. Our results for i-Al(MnFe) show that the dominant EFG is negative, with asymmetry parameter of about 0.6. For i-Al(CrFe), essentially no deviations are found from the model of Czjzek or the Gaussian isotropic model. The β phase is found to have a very similar quadrupole effect as that in i-Al(MnFe).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395545
    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 amorphous and crystalline Sc3Fe alloys (1988)
    Springer
    Hyperfine interactions 42 (1988), S. 931-934 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Amorphous Sc3Fe alloy has been prepared by splat-cooling with levitation melting. The quadrupole splitting distributions for Sc3Fe were determined from Mössbauer spectra: the zero-field distribution has a Gaussian form. The analysis of Mössbauer spectra taken in applied magnetic field show that both positive and negative signs of principal component (Vz2) of electrical field gradients (EFG) are present. The crystallization process has also been investigated. Heat treatment of the amorphous alloys causes crystallization first into a metastable, and then into the stable phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395542
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Hyperfine interactions in ultrafine amorphous Fe−M−B (M=Ni, Co) alloys (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 599-602 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ultrafine amorphous (Fe, Co, Ni) B powders have been prepared by a chemical reduction method. The influence of the Co and Ni atoms on the distribution of internal magnetic fields P(Bhf) has been investigated. The quadrupole splitting distribution P(QS) of ultrafine amorphous Fe−Ni−B powders has a form similar to that derived for the dense random packing of atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401898
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    A review of two decades of the analysis of hyperfine parameter distributions in Mössbauer spectroscopy: Difficulties, progress and prospects (1992)
    Springer
    Hyperfine interactions 71 (1992), S. 1507-1514 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a review of the most used methods used to obtain hyperfine parameter distributions and discuss the mathematical problems. The Czjzek model and extensions for an EFG distribution in random systems is critically reviewed
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397369
    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...