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Magnetization reversal processes in Co-Re antiferromagnetically coupled multilayers: A magneto-optic and Monte Carlo study

Journal of Applied Physics, ISSN: 0021-8979, Vol: 74, Issue: 4, Page: 2692-2700
1993
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Article Description

A study of magnetization reversal processes in sputtered antiferromagnetically coupled (CoRe )×n multilayers, with n=2,3,5 is reported. The two components of the magnetization, parallel and perpendicular to the applied field are analyzed using a suitable transverse Kerr effect differential magneto-optical setup. At the remanent state, and for n=3, and 5, we obtain a magnetization of 1/3 and 1/5 of the saturation magnetization, respectively. This means that the magnetization in each layer is aligned parallel or antiparallel to the applied field direction. The observed perpendicular magnetization component is as expected, much smaller than the parallel magnetization component over the entire length of the hysteresis cycle. A Monte Carlo simulation was used to study the spin configurations in the individual layers as well as the type of magnetization hysteresis cycles. We find that the introduction of a small uniaxial anisotropy is needed to explain the observed multiloop structure in the n=3 multilayers. Within our model, spin-canting may occur within the ferromagnetic layers leading to particular remanent-state spin configurations.

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