Thursday, August 30, 2007, 10:00 am — Bldg. 480 conference room
A study of a series of thin ferromagnetic/antiferromagnetic (F/AF) bilayers grown by ozone-assisted molecular beam epitaxy (OAMBE) is presented. Calcium doped lanthanum manganite perovskites of appropriate doping levels were used to realize the bilayers. We have studied the effect of exchange bias as a function of the AF layer thickness. From the applications standpoint, it is interesting to know the critical AF thickness of an exchange-biased system - a value, below which the effect vanishes. From the results of our investigation, we determine the critical AF thickness. Within the framework of a simple model of Meiklejohn and Bean for the exchange bias, we use the AF thickness dependence and the critical value to estimate magnetocrystalline anisotropy of the antiferromagnetic material, which has not been reported before. The exchange bias is an interfacial phenomenon sensitive to the structural properties of the layers and interfaces in exchange-biased systems. The data verifying the structure and composition of our samples will be presented to confirm the capability of the OAMBE technique to produce high quality films and heterostructures.
Hosted by: Ivan Bozovic
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