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  • 11
    Electronic Resource
    Electronic Resource
    Interface anisotropy and magnetization reversal in epitaxial Fe(001)/Pd double layers : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4466-4468 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Static and dynamic magnetic properties of epitaxial Fe(001) films with Pd overlayers have been measured by means of Brillouin light scattering and magneto-optic Kerr effect magnetometry. From low energy electron diffraction studies, the initial growth of Pd [dPd〈2 monolayer (ML)] is identified as a self-formation process of quasione-dimensional Pd structures. Auger electron spectroscopy examinations proved that for dPd≥2 ML the Pd overlayers cover the Fe films almost completely. The measured frequencies of the dipolar spin wave mode and the derived anisotropy constants show a linear change with increasing dPd up to 5 ML with following saturation. The M(H) curves show pronounced anomalies in the coercive field for dPd〈2 ML accompanied by large tails in the hysteresis loops. The results are interpreted as a strong pinning of domain walls caused by large local changes in the surface anisotropy due to the inhomogeneous Pd cover layer in this regime. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364979
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  • 12
    Electronic Resource
    Electronic Resource
    Antiferromagnetic interlayer coupling in epitaxial Fe/EuS (100) bilayers (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5348-5348 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the observation of antiferromagnetic interlayer coupling between two ferromagnetic layers of Fe(100) and EuS(100), which are in direct contact. The coupling strength J is about 0.2 mJ/m2 at 5 K, it decreases with increasing tempeature and becomes negligibly small near the Curie temperature of the EuS layer. The samples were molecular-beam epitaxy-grown on the GaAs(100) single crystal substrates using a silver buffer layer. The structural and chemical properties of the layers were characterized by in situ low-energy electron diffraction and Auger electron spectroscopy and by ex situ Rutherford backscattering. Superconducting quantum interference device (SQUID) magnetometry was used for measurements of the absolute magnetic moments as a function of temperature or magnetic field. Hysteresis measurements were performed by means of the magneto-optical Kerr effect (MOKE). We found evidence of antiferromagnetic coupling between the two different ferromagnetic layers both from zero field cooling experiments through Tc(EuS) as well as directly from the shape of the hysteresis loops at low temperatures. The temperature dependence of the interlayer coupling strength shows that J is proportional to the EuS magnetization. The observed onset temperature of ferromagnetic order in EuS is up to three times higher than the Curie temperature of bulk EuS. We discuss a mechanism in which this enhancement is connected to the existence of structural defects in the EuS film, caused by the growth. The defects produce additional band carriers, which in turn enhance the Curie temperature of the layer due to a very large indirect s(d)–f exchange.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364541
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  • 13
    Electronic Resource
    Electronic Resource
    Brillouin light scattering investigations of structured permalloy films : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4993-4995 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The static and spin wave properties of regular square lattices of magnetic dots of 0.5–2 μm dot diameter and 1–4 μm periodicity patterned in permalloy films have been investigated by Brillouin light scattering. The samples have been structured using x-ray lithography and ion beam etching. The Brillouin light scattering spectra reveal both surface and bulk spin wave modes. The spin wave frequencies can be well described taking into account the demagnetization factor of each single dot. For the samples with smallest dot separation of 0.1 μm a fourfold in-plane magnetic anisotropy with the easy axis directed along the pattern diagonal is observed, indicating anisotropic coupling between the dots. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364881
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  • 14
    Electronic Resource
    Electronic Resource
    Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping (2006)
    [s.l.] : Nature Publishing Group
    Nature 443 (2006), S. 430-433 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Bose–Einstein condensation is one of the most fascinating phenomena predicted by quantum mechanics. It involves the formation of a collective quantum state composed of identical particles with integer angular momentum (bosons), if the particle density exceeds a critical value. To achieve ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05117
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