Study Of Magnetization And Critical Temperature For Nanomagnetic Particles

Magnetic nanostructures, such as dots and dot arrays, nanowires, multilayers and nano-rnjunctions, are reviewed and compared with bulk magnets. By using the Gibbs free energyrnvariational principle based on the Bogoliubov inequality the magnetic properties and crit-rnical behavior of metallic nanoparticles having concurrently atomic disorder, dilution andrncompeting interactions, are studied within the framework of an Ising model. As a casernof study we have considered the Fe0:5Mn0:1Al0:4 alloy characterized for exhibiting, un-rnder bulk conditions, low temperature reentrant spin glass (RSG) behavior and for whichrnexperimental and simulation results are available. Our results allow concluding that thernvariational model is successful in reproducing features of the dependence of the criticalrntemperature with particle size and low temperature magnetization reduction consistentrnwith a RSG behavior. In this work we compute the magnetization per site and the mag-rnnetic susceptibility, as a function of temperature, for di erent values of the coordinationrnnumber

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