Abstract
We report the effect of α-particle irradiation on the magnetic properties of nickel (Ni) nanowires (NWs) arrays with diameter of each NW ~100 nm prepared by electrodeposition using anodic alumina oxide (AAO) membranes. Different doses of α-particles irradiation, up to 2 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">16</sup> α/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> were used to observe the effect. Structural characterization indicates the reduction in crystallinity of Ni NWs after irradiation. Coercivity (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> ) was found to increase with α-particle dose due to the formation of pinning centers. The magnetic easy axis changed direction from in-plane (with AAO template) to the out-of-plane due to the decrease in magnetocrystalline anisotropy by α-particle irradiation. Furthermore, the effect of α-particle irradiation on Ni NWs was studied by magnetic Barkhausen noise measurements.
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