The influence of weak links on magnetic ordering in layered structuresB. Hjörvarsson1, Yu. Kudasov2, M. Wolff3, T. Hase4, C. Chacon1, M. van Kampen1, P. Nordblad5, A. Liebig1 and H. Zabel3
1 Department of Physics, Uppsala University - Box 530, 751 21 Uppsala, Sweden
2 Russian Federal Nuclear Center VNIIEF - 37, Mira str., Sarov, 607188, Russia
3 Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum - 44780 Bochum, Germany
4 Department of Physics, University of Durham - South Road, Durham DH1 3LE, UK
5 Department of Engineering Sciences, Uppsala University - Box 534, 751 21 Uppsala, Sweden
received 14 July 2007; accepted in final form 5 November 2007; published January 2008
published online 6 December 2007
We discuss the magnetic ordering in layered magnets with two different inherent ordering temperatures. A [V(12 ML)Fe(2 ML)/V(12 ML)(/Fe(3 ML)]70 superlattice with anti- ferromagnetic interlayer exchange coupling is used for this purpose. The more rapid decrease of the magnetic moment in the 2 monolayer thick Fe layers influences the ordering in a non-trivial way. A distribution of the effective ordering temperature is inferred, originating from a more rapid decrease of the magnetic moment in the near-surface region, as compared to the interior of the sample. The results clearly demonstrate the need to consider all energy and length scales when addressing ordering in materials with finite extension.
75.30.-m - Intrinsic properties of magnetically ordered materials.
75.30.Kz - Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.).
75.70.Cn - Magnetic properties of interfaces (multilayers, super lattices, heterostructures).
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