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Kerr Effect Investigations of Magnetic Interlayer Interactions in EuS-PbS Multilayers

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Kowalczyk L., Chernyshova M., Story T., Ha J., Voloubev V., Sipatov A.

Acta Physica Polonica A

2001

vol. 100

issue 3

357-363

Kerr magnetometry was employed to study the temperature dependence of magnetization and magnetic hysteresis loops in ferromagnetic EuS-PbS semiconductor multilayers in the temperature range T=3-35 K at low magnetic fields H≤150 Oe. For EuS-PbS/KCl(100) structures with ultrathin non-magnetic PbS spacer of 1~nm, we observed a maximum on the temperature dependence of magnetization at low fields H≤30 Oe. For higher fields, we found for these structures a regular mean-field-like increase in magnetization with decreasing temperature. The same regular behavior was also found for EuS-PbS/KCl structures with thicker PbS spacer, as well as for all EuS-PbS/BaF_2(111) multilayers independently of spacer thickness. For qualitative interpretation of these findings, we consider two magnetic contributions to the total energy of EuS-PbS multilayers: the Zeeman energy and the antiferromagnetic interlayer exchange coupling between ferromagnetic EuS layers via diamagnetic PbS spacer.

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1 Acta Physica Polonica A

1 2001

1 Chernyshova M.

1 Ha J.

1 Kowalczyk L.

1 Sipatov A.

1 Story T.

1 Voloubev V.

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Kerr Effect Investigations of Magnetic Interlayer Interactions in EuS-PbS Multilayers