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  • Artikel: DFG Deutsche Nationallizenzen  (60)
  • Digitale Medien  (60)
  • 1
    Digitale Medien
    Digitale Medien
    Investigation of the dependence of BLS frequencies on angle of incidence for thin iron films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6754-6756 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Brillouin light-scattering experiments have been done at various angles of incidence, θ, for four specimens prepared by molecular-beam epitaxy. The specimens were single ultrathin films of Fe deposited on single-crystal Ag substrates. Dependence of magnon frequency on θ is easily resolvable in all specimens. We find that the magnitude of this dependence is in good agreement with a theoretical calculation that takes into account magnetic anisotropies, dipole-dipole, and exchange interactions. Our results imply that magnetic excitations in these specimens are correlated over distances of at least 5000 A(ring).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.352475
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic anisotropies in single and multilayered structures (invited) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5769-5774 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Ultrathin magnetic metallic structures provide a variety of systems in which unique magnetic properties can be engineered. The investigation of magnetic anisotropies in ultrathin structures has brought exciting results to the basic studies of magnetism in systems with reduced dimensionality and to the engineering of new magnetic materials. Molecular-beam epitaxy (MBE) techniques turned out to be particularly useful in the formation of new stable and metastable structures whose sharply defined interfaces, lattice relaxations, and lattice reconstructions have resulted in a wide range of interesting magnetic properties. In this presentation the present authors' recent studies of single and multilayered structures composed of bcc Fe(001), bcc Cu(001), lattice-expanded Pd(001), fcc Co(001), and fcc Cu(001) will be summarized. Besides presenting their interesting magnetic properties the following techniques will be highlighted: reflection high-energy electron diffraction (RHEED) and ferromagnetic resonance (FMR). RHEED patterns and RHEED intensity oscillations were used to monitor the MBE growths. It will be shown that RHEED studies provide an effective way to characterize the quality of growth which can then be correlated with the observed magnetic properties. It will be shown that the FMR technique is extremely useful in determining all of the basic magnetic parameters. The role of interfaces, lattice relaxations, and proximity effects on the in-plane fourfold and perpendicular uniaxial anisotropies will be discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350156
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  • 3
    Digitale Medien
    Digitale Medien
    Temperature dependence of the Landau–Lifshitz damping parameter for iron : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6545-6547 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The temperature dependence of the Landau–Lifshitz damping parameter for pure iron has been obtained over the temperature range 290–800 K from the observed amplitude of 73-GHz microwave radiation transmitted through thin single-crystalline slabs, approximately 45 μm thick, at an applied magnetic field corresponding to ferromagnetic antiresonance (FMAR). FMAR occurs when the internal flux density B satisfies the condition B=ω/γ, where ω is the circular frequency of the microwave radiation and γ is the gyromagnetic ratio. An applied magnetic field parallel with the specimen plane was used. The Landau–Lifshitz damping parameter was found to increase slowly and monotonically with temperature from the room-temperature value (0.70 ± 0.06) × 108 Hz to (0.86 ± 0.06)× 108 Hz at 800 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349902
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  • 4
    Digitale Medien
    Digitale Medien
    Magnetic anisotropies in ultrathin fcc Fe(001) films grown on Cu(001) substrates : 35 th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5206-5208 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Brillouin light scattering and ferromagnetic resonance have been used to measure the magnetic-field dependence of the magnon frequency at room temperature for three- monolayer-thick films of fcc Fe(001) grown by means of molecular-beam epitaxy on Cu(001) substrates. These films exhibit a strong uniaxial magnetic anisotropy which causes the magnetization to be oriented perpendicular to the film plane in zero applied field. Four specimens were grown on copper substrates prepared using a chemical polishing technique which avoided the use of abrasives: This treatment greatly reduced the density of etch pits on the copper surface. The uniaxial anisotropies found for these specimens were very consistent and comparable to that previously measured for the best film grown on a mechanically polished copper substrate. There is evidence that substrate smoothness is improved and, hence, that the uniaxial anisotropy is increased when the substrate is covered with a few monolayers of epitaxial copper before the iron films are grown.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348076
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  • 5
    Digitale Medien
    Digitale Medien
    Magnetic properties of MBE structures using fcc Co/Cu(001) and bcc Fe/Cu(001) (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5217-5217 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have used ferromagnetic resonance and surface magneto-optic Kerr effect to investigate the magnetic anisotropies in face-centered-cubic fcc Cu/Co/Cu(001) structures. We have found that Cu/Co/Cu structures possess large magnetic anisotropies. The twofold perpendicular anisotropy results in a strong easy plane (4πMeff = 4πMs + Hu ∼ 40 kOe). The perpendicular uniaxial anisotropy is only weakly dependent on Co film thickness. Hu = 25.4, 23.7, and 17.7 kOe in 3- , 4- , and 10-ML-thick Co films, respectively. The twofold perpendicular anisotropy in fcc Co/Cu/Cu structures is caused by the lateral expansion and vertical contraction of fcc Co(001) ultrathin films. The in-plane fourfold anisotropy in fcc Cu/Co/Cu(001) structures has its easy axis along the [110] crystallographic direction. The fourfold in-plane anisotropy is large (2K1/Ms ∼ 1 kOe) and weakly dependent on Co film thickness. Fe(001) can be grown epitaxially on fcc Co(001) and results in a significant change in the magnetic properties. In Cu/4Co/3Fe/Cu(001) multilayer (integers describe the number of ML) the perpendicular anisotropy changes its sign and is very weak (Hu = −1.5 kOe). The in-plane fourfold anisotropy is also appreciably decreased (2K1/Ms = 0.4 kOe). Cu/4Co/6Cu/〈b〉4Co〈e〉/Cu(001) trilayers are coupled antiferromagnetically. However, this coupling is smaller (J=−0.07 ergs/cm2) compared to bcc Fe/Cu/Fe structures. The exchange coupling in Co/Cu/Co trilayers depends strongly on details of the total structure, e.g., the sample Cu/4Co/6Cu/〈b〉4Co〈e〉/3Fe/Cu is ferromagnetically coupled (J∼0.1 ergs/cm2). The exchange coupling in bcc Fe/Cu/Fe(001) trilayers oscillates with increasing Cu thickness (oscillatory period of 10 ML). However, no evidence of symmetric oscillations was found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.348082
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  • 6
    Digitale Medien
    Digitale Medien
    Analysis of bilinear and biquadratic exchange coupling in Fe/Ag/Fe(001) trilayers : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5966-5968 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Ferromagnetic resonance (FMR) and surface magneto-optical Kerr effect (SMOKE) studies of the exchange coupling in Fe/Ag/Fe(001) structures are presented. The interfaces in these structures can be improved significantly by growing the first Fe(001) layer at a raised substrate temperature. The exchange couplings in Fe/Ag/Fe trilayers were studied as a function of the interlayer thickness and temperature. The improved interfaces in the Fe/Ag/Fe system revealed new features in the exchange coupling which were absent in samples grown entirely at room temperature. Quantitative data from the FMR and SMOKE measurements are compared. The magnetization loops for Fe/Ag/Fe trilayers can be explained well only by including the simultaneous presence of bilinear and biquadratic exchange coupling. It is shown that the exchange coupling through Ag(001) exhibits long wavelength oscillations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.353485
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  • 7
    Digitale Medien
    Digitale Medien
    Ferromagnetic and antiferromagnetic exchange coupling in ultrathin Fe(001)/Pd(001)/Fe(001) structures : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5870-5872 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A new phase of fcc Pd with an expanded lattice (5%) was grown on Fe(001). This structure is maintained up to 12 monolayers (ML) of Pd and then it undergoes a complex lattice reconstruction. Ultrathin Fe/Pd, Pd/Fe bilayers, and Fe/Pd/Fe trilayers with Pd thicknesses between 4 and 18 ML were studied using ferromagnetic resonance and Brillouin light scattering. The metallic Pd and particularly its lattice-expanded structure is believed to have a strong tendency to become ferromagnetic. This tendency was observed in Fe/Pd/Fe trilayers with Pd thicknesses less than 6 ML. The exchange coupling remains ferromagnetic up to 12 ML of Pd and then it changes to a weak antiferromagnetic coupling. The exchange coupling in the ferromagnetic region exhibits a distinct oscillatory behavior superimposed on a decreasing background.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350140
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  • 8
    Digitale Medien
    Digitale Medien
    Exchange coupling through spin density wave Cr(001) using Fe whisker substrates (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5449-5451 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Exchange coupling through spin density wave in Fe whisker/Cr/Fe(001) structures was studied by Brillouin light scattering (BLS) and longitudinal magneto-optical Kerr effect (MOKE) techniques. It will be shown that interface alloying at the Fe whisker/Cr interface profoundly affects the behavior of short wavelength oscillations. The first crossover to antiferromagnetic coupling occurs at 5 monolayers (ML), the phase of short-wavelength oscillations is reversed compared to that expected for the spin density wave in Cr(001), and the strength of coupling is significantly decreased from that obtained from first principle calculations. Using Cu and Ag atomic layers between the Cr(001) and Fe(001) films, heterogeneous interfaces showed that the exchange coupling in Cr(001) is strongly affected by electron multiple scattering. It appears that electron quantum well states in the Fe film play no important role in the strength of the exchange coupling when the Fe film is bounded on one side by Au, but they become important when the Fe film is bounded by Cr on both sides. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.373368
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  • 9
    Digitale Medien
    Digitale Medien
    Interface alloying at Fe/Cr interfaces and its role in exchange coupling, angular resolved Auger electron, magneto-optic Kerr effect, and Brillouin light scattering studies (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4518-4523 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Angular resolved Auger electron studies were carried out for Fe whisker/Cr(001) interfaces which were prepared at 100, 180, 246, and 296 °C. The Cr atoms penetrate progressively into the second (counting from the surface) atomic layer at 100, 180, and 246 °C. At 296 °C the Cr atoms enter the third atomic layer. No noticeable fraction of the Cr atoms was found in the fourth atomic layer. The exchange coupling was studied in Fe whisker/Cr/Fe(001) films which were grown in a nearly perfect layer by layer mode. Magneto-optic Kerr effect and Brillouin light scattering measurements showed that the measured change in the phase of the short wavelength oscillations, the presence of a slowly varying exchange coupling bias, and the small measured values of exchange coupling are caused by the same mechanism: interface alloying. The exchange coupling in Fe whisker/Cr/nFe specimens, for n=10, 20, 30, and 40 ML, showed no obvious dependence on the Fe layer thickness. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361768
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  • 10
    Digitale Medien
    Digitale Medien
    "Loose spins'' in Fe/Cu/Fe(001) structures : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6187-6189 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Slonczewski recently proposed a model for the exchange coupling between ferromagnetic layers separated by a nonferromagnetic spacer based on the concept of "loose spins.'' "Loose spins'' contribute to the total exchange energy. We have studied the role of "loose spins'' in bcc Fe/Cu/Fe(001) structures. bcc Fe/Cu/Fe(001) trilayers deposited at room temperature were investigated extensively in our previous studies. In our "loose spin'' studies, the Fe was added inside the Cu interlayer. Several structures were atomically engineered in order to test the behavior of "loose spins:'' One additional atomic layer of an (Fe+Cu) alloy were located in appropriate positions in a Cu spacer. The bilinear and biquadratic exchange coupling in the above structures was quantitatively studied with FMR in the temperature range 77–370 K and with MOKE at RT.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.355451
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