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  • Electronic Resource  (7)
  • 2000-2004  (7)
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  • Electronic Resource  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Interface contribution to giant magnetoresistance in granular AgFe studied with Mössbauer spectroscopy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4212-4215 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetotransport properties of granular thin AgFe films, prepared by codeposition of the constituent metals in an ultrahigh vacuum have been investigated. Mössbauer spectroscopy was employed to investigate the role of scattering of conduction electrons at the interface between the magnetic Fe particles and the Ag matrix. It is possible to determine the ratio of Fe atoms located at the Ag/Fe interface and in the particles (bulk atoms). The giant magnetoresistance effect correlates with the ratio of interface/bulk atoms. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289232
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  • 2
    Electronic Resource
    Electronic Resource
    Depth-selective conversion-electron Mössbauer spectroscopy of the surface of Ba-M hexaferrite single crystals (2000)
    Springer
    Physics of the solid state 42 (2000), S. 897-902 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic properties of a 50-to 2-nm-thick surface layer in hexagonal ferrite BaFe12O19 single crystals are investigated for the first time. Measurements are made on a conversion-electron Mössbauer spectrometer constructed on the basis of a unique ultrahigh-vacuum magnetostatic electron analyzer of the “orange” type. An analysis of the experimental Mössbauer spectra obtained from the surface layer of BaFe12O19 50-to 2-nm-thick single crystals reveals that (1) the spectral line widths are close to the natural widths of Mössbauer lines and neither changes nor a set of the values of effective magnetic fields, as well as a paramagnetic state of iron ions, could appear due to a defect such as the “surface,” and (2) the experimental spectra are best described only under the assumption that the surface of a hexaferrite BaFe12O19 single crystal contains a 2-nm-thick layer, in which the magnetic moments of iron ions are deflected through ∼20° from the crystallographic C axis along which the magnetic moments of ions located in the bulk of the crystal are oriented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131309
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of surface on the effective magnetic fields in α-Fe2O3 and FeBO3 (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1691-1695 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract First measurements of the effective magnetic fields as a function of the depth at which the iron ions are in the surface layer of α-Fe2O3 and FeBO3 single crystals are reported. The method used is the depth-selective conversion-electron Mössbauer spectroscopy. An analysis of experimental spectra revealed that the magnetic properties of the crystal surface vary smoothly from the bulk to surface characteristics within a layer ∼100 nm thick. The layers lying below ∼100 nm from the surface are similar in properties to the bulk of the crystal, and their spectra consist of narrow lines. The spectral linewidths increase smoothly as one approaches the crystal surface. The spectra obtained from a ∼10-nm thick surface layer consist of broad lines indicating a broad distribution of effective magnetic fields. Calculations show that the field distribution width in this layer is δ=2.1(3) T, for an average value H eff=32.2(4) T. It has been experimentally established that, at room temperature (291 K), the effective magnetic fields smoothly decrease as one approaches the crystal surface. The effective fields in a 2.4(9)-nm surface layer of α-Fe2O3 crystals are lower by 0.7(2)% than the fields at the ion nuclei in the bulk of the sample. In the case of FeBO3, the effective fields decrease by 1.2(3)% in a surface layer 4.9(9) nm thick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1309453
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  • 4
    Electronic Resource
    Electronic Resource
    Critical behavior of the surface of FeBO3 single crystals (2000)
    Springer
    JETP letters 71 (2000), S. 442-445 
    Details
    ISSN: 1090-6487
    Keywords: 75.30.Kz ; 75.40.−s ; 68.35.Rh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The behavior of the surface and near-surface layers of macroscopic FeBO3 single crystals is studied over the temperature range from 291 K to Neél temperature (T N ) using depth-selective conversion-electron Mössbauer spectroscopy. Three different phases or states, namely, an antiferromagnetically ordered phase (similar to the crystal bulk state), a surface phase, and a transition layer between them coexist near the Neél point in a surface layer ∼500 nm thick. The critical parameters found for the bulk phase agree well with the theoretical critical index νth≅0.63 predicted by the 3D Ising model. As the crystal surface is approached, the critical parameter β increases to 0.51(2) but remains smaller than the value of β=0.8 for the surface of a semi-infinite Heisenberg model. Therefore, the effective dimensionality of the system, being equal to 3 in the bulk, decreases at the crystal surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568373
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  • 5
    Electronic Resource
    Electronic Resource
    Lowering of magnetic field intensity at the surfaces of α-Fe2O3 and FeBO3 single crystals (2000)
    Springer
    JETP letters 71 (2000), S. 134-137 
    Details
    ISSN: 1090-6487
    Keywords: 75.70.Ak ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Depth-selective conversion electron Mössbauer spectroscopy was used to study magnetic properties of the thin surface layers of the α-Fe2O3 and FeBO3 single crystals. An analysis of the experimental spectra indicates that the magnetic properties of the layers at a depth of more than ∼100 nm from the surface are similar to the properties of crystal bulk, and the corresponding spectra consist of narrow lines. The lines gradually broaden as the crystal surface is approached. The spectra of the ∼10-nm-thick surface layers consist of broad lines, indicating a wide distribution δ=2.1 T of the effective magnetic field about its mean value of 32.2(4) T. The experimental spectra were used to determine the effective magnetic fields (H eff) for the iron ions situated in the surface layers of thickness ∼100 nm. The effective fields in these layers were found to gradually decrease at room temperature (291 K) as the crystal surface was approached. The H eff values in the 2.4(9)-nm-thick surface layer of the α-Fe2O3 crystal and 4.9(9)-nm layer of FeBO3 are 0.7(2) and 1.2(3)%, respectively, smaller than for the nuclei of the ions in the bulk of these crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568298
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  • 6
    Electronic Resource
    Electronic Resource
    Antiferromagnetic exchange coupling in amorphous Fe–Sc alloys (2000)
    Springer
    Hyperfine interactions 126 (2000), S. 15-19 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of 57Fe Mössbauer, AC and DC susceptibility, grazing incidence X-ray diffraction, resistivity and Rutherford-backscattering measurements on the amorphous alloys $${\text{Fe}}_{100 - x} {\text{Sc}}_x (8 \leqslant x \leqslant 70)$$ give for the first time convincing evidence for the antiferromagnetic exchange coupling between Fe-moments. The antiferromagnetic coupling between Fe-moments is for $$(8 \leqslant x \leqslant 70)$$ limited to certain regions (magnetic clusters) of the sample. The nature of the coupling is of the Heisenberg type. For $$8 \leqslant x 〈 20$$ , the magnetic coupling between Fe-moments is across nonmagnetic Sc-atoms. The conduction electrons mediate an indirect magnetic interaction between the Fe-moments. The magnetic exchange coupling between Fe-moments across Sc-atoms is negative. The antiferromagnetic coupling between Fe-moments can be explained by the Ruderman-Kittel-Kasuya-Yosida, RKKY, interaction by taking into account the damped oscillatory behavior of the RKKY interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012672123675
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  • 7
    Electronic Resource
    Electronic Resource
    Reduced magnetic hyperfine field at the surface of α-Fe2O3 and FeBO3 single crystals (2000)
    Springer
    Hyperfine interactions 126 (2000), S. 371-376 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface magnetic ordering of an α-57Fe2O3 and 57FeBO3 single crystal was studied by Depth Selective Conversion Electron Mössbauer Spectroscopy (DCEMS). The depth selective Mössbauer data of 57FeBO3 up to the Néel temperature (T N = 348.35 K) reveal the coexistence of the canted antiferromagnetic bulk phase and a magnetic surface phase that shows time relaxation. Both phases are separated by a wall (interim layer) and the thickness of the magnetic surface layer increases as the crystal is heated to T N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012666527793
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