arXiv subjects

R. Lavín

Publications and source records attributed to R. Lavín.

3 recordsLinked to original sources

arXiv2014

Magnetic properties of Co/Cu/Py antidot films

The magnetic properties of ordered nanoscale Co/Cu/Py multilayer antidot films with different pore sizes prepared on top of nanoporous alumina membranes are presented. By using Co and Py films separated by a Cu thin layer, and tuning the pore diameters of the NAMs we were able to play with the coercivity of the films and observe stepped magnetization curves, as a consequence of the different coercivities of the Co and Py films. The magnetic properties of the multilayer antidots have been measured and compared with results obtained for antidots of Cu/Py. The magnetization reversal process that occurs in each individual layer and in the multilayer was studied by means of micromagnetic simulations.

cond-mat.mtrl-sci↗

arXiv2014

FORC and Micromagnetism Approach to the Domain Structure of Cobalt Antidot Arrays

We study the influence of the porosity on the domain structure of cobalt antidots thin films with controlled and circular defects of 20, 40 and 60 nm of diameter. Micromagnetic simulations, combined with First-order reversal curves analysis of classical magnetometry measurements, have been used to track the evolution of the magnetic domain configurations. The found coercivity enhancement with the increase of the pore diameter is correlated to the domain reversibility. Moreover, we found that when the pores diameter increases the domain-domain interactions become dominant.

cond-mat.mtrl-sci↗

arXiv2010

Angular dependence of magnetic properties in Ni nanowire arrays

The angular dependence of the remanence and coercivity of Ni nanowire arrays produced inside the pores of anodic alumina membranes has been studied. By comparing our analytical calculations with our measurements, we conclude that the magnetization reversal in this array is driven by means of the nucleation and propagation of a transverse wall. A simple model based on an adapted Stoner-Wohlfarth model is used to explain the angular dependence of the coercivity.

cond-mat.mes-hall↗