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  • 1
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of face-centered-cubic Fe films grown on Co(100) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4964-4966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A rich variety of magnetic and structural properties have been found in fcc Fe films grown on Cu(100). In order to better comprehend the relation between the magnetic and structural properties of fcc Fe, we investigated fcc Fe films grown by molecular beam epitaxy on fcc Co(100). Structural characterization by low-energy electron diffraction and reflection high-energy electron diffraction indicate that the structural properties of fcc Fe films grown on Co(100) at room temperature are very similar to those of fcc Fe on Cu(100), exhibiting three distinct regions (fct, fcc, and bcc), with characteristic reconstructions at the boundaries. Magnetic measurements with in situ surface magneto-optic Kerr effect (SMOKE) reveal in-plane magnetization at room temperature for the three regions. Regions I and III are ferromagnetic, while region II has a small Kerr signal which is constant throughout the region. Cusps in the coercivity of the SMOKE loops are found to correspond to transitions between the three regions. Oxygen absorption experiments performed at room temperature revealed no change in the magnetization of region II, suggesting that the live layers responsible for the magnetic signal in this region are not at the surface. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361922
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic and structural instabilities of ultrathin Fe(100) wedges (invited) : 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. 6419-6424 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An overview is provided of recent efforts to explore magnetic and related structural issues for ultrathin Fe films grown epitaxially as wedge structures onto Ag(100) and Cu(100). Experiments were carried out utilizing the surface magneto-optic Kerr effect. Ordinary bcc Fe is lattice matched to the primitive unit cell of the Ag(100) surface. Fe wedges on Ag(100) can be fabricated whose thick end has in-plane magnetic easy axes due to the shape anisotropy, and whose thin end has perpendicular easy axes due to the surface magnetic anisotropy. A spin-reorientation transition can thus be studied in the center of the wedge where the competing anisotropies cancel. The goal is to test the Mermin–Wagner theorem which states that long-range order is lost at finite temperatures in an isotropic two-dimensional Heisenberg system. Fe wedges on Cu(100) can be studied in like manner, but the lattice matching permits fcc and tetragonally distorted fcc phases to provide structural complexity in addition to the interplay of competing magnetic anisotropies. The results of these studies are new phase identifications that help both to put previous work into perspective and to define issues to pursue in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358283
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic coupling in Co/face-centered-cubic Fe/Co sandwiches : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4532-4534 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnetic (FC) and antiferromagnetic coupling (AFC) of Co layers across a metastable fcc Fe spacer layer has been observed. Room-temperature-grown Fe on Co/Cu(100) was chosen as a spacer layer because it exhibits three distinct structural and magnetic phases depending on the thickness range: fct and ferromagnetic (region I), fcc and nonferromagnetic (region II), bcc and ferromagnetic (region III) (listed in order of increasing thickness). Co/Fe/Co sandwiches were grown on Cu(100) by molecular beam epitaxy with a base pressure of ∼2×10−10 Torr, and characterized by low-energy electron diffraction and reflection high-energy electron diffraction. The magnetic properties were studied in situ using surface magneto-optic Kerr effect. Using a wedged Fe spacer layer, we investigated the magnetic coupling between Co films across many thicknesses of Fe. We found FC in region I, strong AFC at the boundary between regions I and II, and weak AFC in region II. We also studied the effect of just the Co overlayer on the metastable fcc Fe. We find that Co/Fe/Cu(100) differs qualitatively from Fe/Co/Cu(100). Finally, we find an oscillation in the AFC with a periodicity of ∼12 A(ring) by artificially increasing the thickness range of region II. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361714
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic and structural instabilities of ferromagnetic and antiferromagnetic Fe/Cu(100) : 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. 6425-6427 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe wedges epitaxially grown on Cu(100) have been employed to investigate the interplay between magnetic and structural instabilities. 2–4 monolayer (ML) clean Fe films grown at room temperature are ferromagnetic with perpendicular easy axes. bcc Fe films(approximately-greater-than)11 ML thick are ferromagnetic with in-plane easy axes. Most importantly, 6–11 ML fcc Fe films are antiferromagnetic and have a ferromagnetic surface. Films grown below 200 K and annealed to room temperature do not exhibit the antiferromagnetic phase, but remain ferromagnetic and undergo a spin-reorientation transition from perpendicular to in plane at ∼6 ML. A new phase diagram for Fe/Cu(100) is proposed as a function of thickness and growth temperature. In addition, an impurity-stabilized layer-by-layer growth that persists to 30–40 ML Fe is also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358284
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  • 5
    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
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  • 6
    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
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  • 7
    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
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  • 8
    Electronic Resource
    Electronic Resource
    Surface magneto-optic Kerr effect (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1243-1255 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The surface magneto-optic Kerr effect (SMOKE) has significantly impacted research on magnetic thin films. This is due to its sensitivity, local probing nature, and experimental simplicity. The polar and longitudinal Kerr effects are characterized by a complex rotation of the plane of polarization of linearly polarized incident light upon reflection from the surface of a ferromagnetic material. The rotation is directly related to the magnetization of the material within the probing region of the light. Light penetrates into metals 〉20 nm deep, but the SMOKE technique derives its surface sensitivity from the limited thickness of the deposited magnetic film, which can be as thin as one atomic layer. Basic principles, experimental arrangements, and applications of SMOKE are reviewed in order to acquaint the nonspecialist with the technique and place it into perspective. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150496
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  • 9
    Electronic Resource
    Electronic Resource
    Modification of the magnetic properties of Fe/Cr(001) by controlling the compensation of a vicinal Cr(001) surface (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4961-4963 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The degree of compensation of a normally uncompensated Cr(001) surface is controlled by using a curved substrate with steps parallel to the [100] direction. In this way, the degree of frustration caused by steps at the interface between an Fe overlayer and the Cr substrate can be systematically varied. Previous work on flat Cr(001) at temperatures below the Cr ordering temperature (311 K) has identified a critical Fe thickness of ∼35–38 Å, below which the Fe films display a reduced remanence. For our curved Cr substrate, below this critical Fe thickness three phases are observed for low (〈∼2.5°), intermediate and high (〉∼5°) miscut angle respectively: (i) multidomain; (ii) single domain with magnetization perpendicular to the step edges; and (iii) single domain with magnetization parallel to the step edges. At the same temperature, for Fe films above the critical thickness, region (i) disappears and only regions (ii) and (iii) remain. In a second experiment, the adsorption of submonolayer Au on the Fe is observed to increase the strength of the step-induced anisotropy and accordingly vary the position of the transition from regions (ii) to (iii). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370058
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  • 10
    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
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