Ni NANOWIRES AS SENSORS OF LOCAL THERMALDEFORMATIONSIN POROUS MATRICES

ANA MARÍA GENNARO; CARLOS A. RAMOS; LUISINA FORZANI; ROBERTO R. KOROPECKI

Montpellier

Conferencia; Porous Semiconductors - Science and technology; 2018

Institut Charles Gerhardt Montpellier - Université de Montpellie

We study the use of the magnetic anisotropy of Ni nanowire arrays (NWs) in a nanostructured porous alumina matrix (NPA) to evaluate local temperature induced deformations, taking the NW as in situ sensors of deformation and structural properties of the matrix. After removing the aluminum substrate, we measured magnetic anisotropy as a function of the sample temperature, by different magnetic characterization techniques. Anincrease of magnetic anisotropy was observed from 90 to 350 K. This increase is consistent with significant magnetoelasticeffects due to the interaction of NWs with the NPA matrix. X-ray diffraction (XRD) results show that, contrary to the case of massive Ni, the NWs suffer a contraction while temperature increases, in agreement with the existence of magnetoelastic effects.