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
  • 1
    Electronic Resource
    Electronic Resource
    Oscillatory interlayer coupling through (111) oriented noble metal spacers : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6464-6466 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We use a surface-sensitive Mössbauer spectroscopy technique to examine the spin-wave spectrum, at the Fe(110)/NM(111) interface only, of a multilayer structure with a noble metal (NM) interlayer. We find that the temperature dependence of the hyperfine field follows a Bloch law (1−BT3/2), and use spin-wave calculations to connect the surface spin-wave stiffness parameter, B, to the interlayer exchange coupling. Films grown with Ag(111) interlayers show clear oscillations with a period of 6 ML, in good agreement with recent predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356963
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Mössbauer investigation of zinc ferrite particles (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4105-4107 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mössbauer spectra of Zn0.2Fe2.3O4 particles at different temperatures have been obtained. They have been analyzed with five components, one due to the A-site Fe3+ ions, and the others due to the B-site Fe3+ and Fe2+ ions. Magnetic and electronic properties have been discussed with regard to zinc substitution and temperature dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340509
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Superconductivity and spin-glass ordering in RBa2 (Cu1−xFex)3Oz: R=Y,Gd; 0≤x≤0.12 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4161-4163 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Samples of oxygen deficient perovskites, YBa2 (Cu1−x Fex )3Oz and GdBa2 (Cu1−x Fex )3 Oz (z(approximately-equal-to)7) were prepared with up to 12% Fe substituting for Cu. A novel variation of the microwave absorption technique was employed to establish the superconducting transition in these samples and to show that the reduction in the transition temperature with increasing Fe concentration is faster in the Gd samples than in the Y ones. In both series of samples, the room-temperature Mössbauer spectra reveal two distinct Fe sites corresponding to two local oxygen coordinations, and more significantly the spectra at 4.2 K for specimens with x≥0.03 show that the Fe moments are magnetically ordered, leading to the coexistence of superconductivity and magnetism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340528
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Persistence of magnetic surface anomalies in (110) Fe near an interface with MnF2 (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3756-3756 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An anomalous quasilinear temperature dependence has been previously observed1 in the surface layers of Fe at an interface with MnF2. The (110) Fe was epitaxially grown to a thickness of about 50 layers on a (111) Ag substrate. The magnetic hyperfine field in the surface layers was probed by making the Fe sample from isotopically pure 56Fe and then growing the layer(s) of interest from 57Fe. Mössbauer spectroscopy is used to determine the magnetic hyperfine field on a layer-by-layer basis. For other interfaces besides MnF2 (for example, Ag, MgO) the surface layers of (110) Fe show a T3/2 dependence somewhat different from bulk. To better understand the unusual quasilinear behavior at the MnF2 interface, we have examined the temperature dependence of the magnetic hyperfine fields at layers somewhat deeper in the (110) Fe sample than the actual surface/interface. We report here measurements showing a linear temperature dependence for 57Fe layers at least five layers into the sample from the surface/interface. The slope of the Heff vs T curve is much smaller than for the surface region. Still deeper layers at least 10 layers into the sample from the surface/interface begin to show a T3/2 behavior which differs little from bulk values. We offer an explanation of this persistence of the surface effects into the deeper layers of the (110) Fe sample based on a surface anisotropy model. This explanation does not depend on the actual mechanism of the surface anisotropy and can remain valid if the source of the anisotropy is an exchange interaction between the surface Fe spins and the spins associated with the Mn ions in the MnF2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338632
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Effect of cobalt-ferrite epitaxial layer on the coercivity of ZnFe-ferrite particles (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3898-3898 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Zn0.2Fe2.8O4 particles were prepared and coated with different amounts of cobalt-ferrite. The coercivity increases with increasing cobalt-ferrite coating. In the low Co-ferrite coating regime, the increase is induced by an enhanced anisotropy of the interface layer, while in the high coating regime, it is due to the Co-ferrite surface layer. The full depth of the interface layer was found to be approximately 8 A(ring), and the temperature dependence of the change in coercivity in both low and high Co-ferrite coating regimes was discussed. Mechanisms leading to a greatly increased coercivity of acicular Co-γ-Fe2O3 were also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338602
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Examination of epitaxial (111)Ag/(110)Fe heterostructures (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4332-4332 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have spent a number of years growing (110) Fe films on (111) Ag substrates. This is a well-known epitaxial system and there is little or no diffusion at the Ag/Fe interface. Furthermore, no alloys or intermetallic compounds form. The disadvantage is that (110) Fe grows on (111) Ag in three possible directions so that single crystal growth is difficult to achieve. Despite this we consider this system to be a good candidate for producing high quality metallic superlattices. Our earlier work1 indicates that the magnetic properties of such superlattices may depend critically on the relative thicknesses of Fe and Ag. Toward this end we have begun to make high quality structures consisting of two or more cycles of Fe and Ag of differing thicknesses. We report here on samples of Ag/Fe/Ag with the (110) Fe layer approximately 4–10 layers in thickness. Magnetic measurements on the samples are made by Mössbauer spectroscopy and SQUID magnetometry. Preliminary results indicate that for the thinnest Fe layers (∼4 layers) the magnetic hyperfine field and SQUID magnetometry measurement shows anomalous temperature dependence, indicating a noncontinuous island growth of the Fe. This island growth of the Fe can be prevented by cooling the Ag substrate to 100 K during the Fe deposition. Comparisons to samples in which two or more Fe layers are separated by very thin (∼5 layer) Ag films are made. In this case hyperfine fields are measured whose temperature dependence is different from that measured for single isolated Fe films. These results will be discussed in terms of conduction electron polarization transmitted through the Ag layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338464
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Comparison of surface spin wave modes at Fe/MnF2 and Fe/Mn interfaces (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5293-5295 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the thermal demagnetization in semi-infinite ferromagnets in Fe/MnF2 and Fe/Mn bilayers using Mössbauer spectroscopy. We find that the hyperfine field at the Fe/MnF2 interface follows a quasilinear temperature dependence, which reverts to a T3/2 dependence further into the bulk. The region in which linear temperature dependence was observed also showed significantly higher spin canting than in the film's bulk layers. The interface in the Fe/Mn system immediately showed a T3/2 dependence which persisted deeper into the bulk. We attribute the linear temperature behavior to surface spin wave modes created by a perpendicular surface anisotropy at the interface. This behavior diminishes farther away from the interface, until the hyperfine field goes like T3/2 as expected for bulk, 3D spin waves. We conclude that the perpendicular surface anisotropy is much stronger at the Fe/MnF2 than the Fe/Mn interface. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314871
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    (110)Fe/(111)Ag superlattices by MBE (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5343-5343 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have successfully produced a variety of high-quality (110)Fe/(111)Ag superlattices using a Perkin-Elmer Model 430B molecular-beam epitaxy system (MBE) with Fe structures as thin as 2 atomic layers and Ag structures as small as 7 layers. The growth of the superlattices was continually monitored by reflection high-energy electron diffraction (RHEED). The magnetic properties determined by Mössbauer spectroscopy show a strong dependence on the respective thicknesses of the Fe and Ag repeat structures which makes up the superlattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342365
    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 ordering and superconducting in Fe-doped 1-2-3 compounds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5947-5949 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have doped Fe into the ground YBa2Cu3O7 and have discovered that the Fe goes primarily into one of the two Cu sites. At least 95% of the Fe substitutes into the Cu(1) site in the Cu-O layers between Ba layers. A high valence state of iron, Fe4+, is found to exist inside this compound. For even small amounts of Fe we see a spin-glass type of magnetic ordering of the Fe spins which we feel is associated with a tendency for antiferromagnetic couplings of the Cu(1) ions. We conclude that the Cu(2)-O2 plane is more important than the Cu(1)-O chain for the superconductivity in the 1-2-3 compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342159
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties of fine iron particles (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3314-3316 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron particles were prepared by a gas evaporation method in a nitrogen atmosphere. The particle size, shape, and magnetic properties were influenced by the nitrogen pressure. Particles prepared by this method were relatively stable in air and were not seriously oxidized. The recoilless fraction is low for the oxide layer, so that it cannot be detected at room temperature by Mössbauer spectrum. A superparamagnetic peak associated with the oxide microcrystal layer did not occur in the Mössbauer spectra due to the action of the magnetic field from the iron core and the interaction between iron particles and the low Debye temperature. From the electron micrography, the magnetic reversal process seems to be determined by a chain-of-spheres mechanism but Hc∼T curve cannot coincide with the Ms∼T curve at low temperatures. An increase of Hc may be associated with magnetic anisotropy. It is found that the magnetization versus temperature shows an anomalous increase in M(T) at higher T. We think that this means that the surface oxide layer was not magnetized to saturation even under 40 kOe at 5.5 K as the surface anisotropy is rather large.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338893
    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...