Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: Berger L, Labaye Y, Ovidiu Crisan, Greneche JM, Coey JMD
Editorial: JOURNAL OF APPLIED PHYSICS, 91 (10), p.7634-7636, 2002.
The magnetic properties of a ferromagnetic cylinder containing an antiphase boundary with antiferromagnetic interactions are studied using atomic Monte Carlo simulation. The approach to saturation shows a reduced magnetization compared with the completely ferromagnetic sample, even in huge applied fields. The magnetization profiles are studied as a function of the number of ferromagnetic planes in the cylinder with 80 atoms per plane and also as function of the ratio of the bulk-to-antiphase exchange coupling. Hysteresis appears after removing the applied field for relatively low antiphase boundary densities. It is shown that the antiferromagnetic coupling across the antiphase boundary leads to a progressive rotation of spins as the two half „domain walls” at the boundary with opposite chirality narrow with increasing applied field.
Cuvinte cheie: antiferromagnets, antiphase boundaries, Monte Carlo simulation