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Magnetic properties of nanometric Fe wires obtained by multiple extrusions

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6 Author(s)
Wacquant, F. ; Lab. Louis Neel, CNRS, Grenoble, France ; Denolly, S. ; Giguere, A. ; Nozieres, J.P.
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A method for producing arrays of nanometric wires is briefly described. The method consists of extruding a compact containing parallel iron wires spaced in a copper matrix until the wires become extremely small (10 nm at the ultimate stage). Coercive forces up to 0.04 T are found. A clear shape-induced anisotropy is observed. The decrease in HA observed at the smallest diameters is attributed to wire distortion. The activation volume deduced from magnetic aftereffect measurements is 6×104 nm3 . It is much larger than the one expected in the case of coherent rotation. Its value is rather consistent with a collective magnetization reversal process. The angular dependence of HC approaches a 1/cos θ law. This behavior excludes coherent rotation. It is expected whenever the coercive field is much weaker than the anisotropy field in the activation volume

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )