KERR EFFECT INVESTIGATIONS OF MAGNETIC INTERLAYER INTERACTIONS IN EuS--PbS MULTILAYERS |
| L. Kowalczyk, M. Chernyshova, T. Story Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland J.K. Ha Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands V.V. Voloubev and A.Yu. Sipatov Kharkov State Polytechnical University, 21, Frunze Str., 310002 Kharkov, Ukraine |
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| 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 -- 35K at low magnetic fields H<=150Oe. For EuS--PbS/KCl(100) structures with ultrathin non-magnetic PbS spacer of 1nm, we observed a maximum on the temperature dependence of magnetization at low fields H<=30Oe. 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/BaF2(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. |
| DOI: 10.12693/APhysPolA.100.357 PACS numbers: 75.20.Ck, 75.30.Et |