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  • 1990-1994  (3)
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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetostriction and magnetic properties of iron-cobalt alloys multilayered with silver : 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. 6534-6536 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Commercially available Fe-Co alloys with Co contents of 50 and 24 wt. % have been rf sputtered to produce multilayers with noble metal (Ag or Cu) interlayers. Series with fixed Fe-Co or noble metal thicknesses have been produced, as have plain Fe-Co films. In all cases, the coercivities of the multilayers are significantly reduced from those exhibited by the plain alloy films. For example, a film of the alloy containing 50 wt. % Co had Hc=6.9 kA m−1, whereas a multilayer with 12 nm Fe-Co layers and 2 nm Ag layers had Hc=480 A m−1. The saturation magnetostriction is also enhanced, in some cases increasing by 60% over the expected bulk polycrystalline alloy value. For example, the literature λs value for a Fe-Co alloy containing 24% Co is about 28 ppm; in a multilayer with 12 nm alloy layers and 8 nm Ag layers, λs=45 ppm. The combination of high magnetostriction and low coercivity makes such materials as these attractive for their potential as stress sensor and actuation transducer elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358215
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetoresistance and magnetization in submicron ferromagnetic gratings (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5249-5256 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technique for engineering micron and submicron scale structures from magnetic films of transition metals has been developed using a combination of electron- and ion-beam lithography enabling high-quality arrays of submicron magnetic Fe wires to be fabricated. This process can be used to fabricate novel devices from a variety of metal combinations which would not be possible by the usual liftoff metallization method. The structure and magnetic properties are reported of an epitaxial 25 nm Fe(001)/GaAs(001) film and the wire gratings which are fabricated from it. The width of the wires in the grating is 0.5 μm for all structures studied, but the separation of each wire is varied in the range 0.5 to 16 μm. An artificially induced shape anisotropy field of around 1 kG, consistent with a magnetostatic calculation, was observed for all separations studied. The field dependence of the magneto-optic Kerr effect and magnetoresistance (MR) data is consistent with a twisted magnetization configuration across the width of the sample beneath saturation for transverse applied fields. In this case, the detailed form of the field dependence of the MR is strikingly modified from that observed in the continuous film and is consistent with coherent rotation of the magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355723
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Non-linear Doppler shift of the plasmon resonance in a grating-coupled drifting 2DEG (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 1237-1249 
    Details
    ISSN: 1572-9559
    Keywords: Plasmon ; 2DEG ; Lateral Drift ; Grating
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report experimental measurements and computer calculations of the plasmon resonances of two dimensional electron gases in the far-infrared which show the effects of laterally drifting the 2DEG. Coupling to radiation is achieved using an overlaid metal grating of submicron period, and its periodic screening effect splits the plasmon into upper and lower energy modes. For a symmetric grating profile the higher energy mode is non-radiative for a stationary 2DEG and a splitting is not observable, but when the 2DEG is laterally drifted under the grating, coupling to both modes can occur, and their Doppler shifts produce an observable splitting which increases with drift velocity. These Doppler shifts are not linear with drift velocity for low velocities, but approach asymptotically the expected linear shift with increasing drift velocity. Experimental results on 2DEGs at GaAs/AlGaAs heterojunctions compare well with theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02146254
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    Paper (German National Licenses)
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