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  • 1
    Electronic Resource
    Electronic Resource
    Effective magnetization of rotating free ferromagnetic metal clusters (1994)
    Springer
    The European physical journal 29 (1994), S. 67-72 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 75.60.Jp ; 76.50.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The deflection of free magnetic metal clusters in a Stern-Gerlach magnetic field is studied. In particular we investigate magnetic resonance effects resulting from lattice anisotropy and cluster rotation. In analogy to small suspended particles in an oscillating magnetic field the anisotropy field fixed to the rotating atomic lattice of the cluster acts on the cluster magnetization like an rf field in NMR experiments. In our calculation we have used the Bloch equations and assumed different anisotropy field symmetries (uniaxial, cubic). A minimum in the magnetization as a function of the Stern-Gerlach field and also of the cluster size, as observed recently, is obtained under certain conditions. However, such a resonance behavior occurs only if the distribution of the rotation frequency ωrot is relatively narrow, while a broad distribution of ωrot yields an almost superparamagnetic behavior. In addition, the strength of the anisotropy field and the relaxation time are important variables which determine the magnetic behavior of the clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437167
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rotational effects on the magnetic properties of an ensemble of free metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 246-248 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 75.60.Jp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetization of an ensemble of free magnetic metal clusters in an inhomogeneous external magnet field is calculated. In particular we have investigated the effects of the combined lattice anisotropy and cluster rotation on the magnetic properties. If weak anisotropy is present, almost superparamagnetic behavior is obtained. For stronger anisotropies deviations from this are calculated as a consequence of spin resonance due to the anisotropy field and the cluster rotation. This was proposed recently by de Heer et al. to explain his experimental data as generally expected, since a rotating cluster in a static magnetic field should behave similarly than a nonrotating one in an oscillating magnetic field. The magnetization depends also sensitively on the relaxation times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429158
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Theory for spin relaxation in small magnetic metal clusters (1991)
    Springer
    The European physical journal 21 (1991), S. 349-356 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 75.60.Jp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the magnetic properties of small neutral transition-metal clusters like Fe n and Co n deduced from Stern-Gerlach deflection experiments. We claim that the asymmetric Stern-Gerlach deflection profiles are due to a transfer from electronical angular momentum to the cluster rotation, allowing for a depopulation of the high energy magnetic levels. For finite temperatures we consider two limiting cases. First, the cluster magnetization is assumed to be tied to the random orientation of the cluster easy axes due to the lattice anisotropy. This causes a surprisingly small magnetization for small external magnetic fields. For larger fields and also for increasing temperatures the magnetization is released from the cluster geometry and allowed to align itself parallel to the field. In the second case the clusters are treated as an ensemble of superparamagnetic particles. Here, the effect of the anisotropy is less visible. The cluster lattice anisotropy per atom is expected to decrease for increasing cluster size. Preliminary results support this.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438408
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    Paper (German National Licenses)
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