Europhys. Lett, 48 (2), pp. 228-232 (1999)
Ferromagnetic ground state in thin films
E. B. Nyeanchi 1, I. P. Krylov 2, X.-M. Zhu 1 and N. Jacobs 2,3
1 University of Umeå, Department of Experimental Physics - S-90187,
2 University of the Western Cape - Bellville 7535, South Africa
3 National Accelerator Centre - Faure 7131, South Africa
(received 24 June 1999; accepted 13 August 1999)
PACS. 75.30Vn - Colossal magnetoresistance.
PACS. 75.50Cc - Other ferromagnetic metals and alloys.
PACS. 75.70Ak - Magnetic properties of monolayers and thin films.
Resistivity and magnetisation measurements were done with bulk and thin-film samples of . Bulk samples showed an antiferromagnetic insulating ground state as expected for this composition, whereas thin films demonstrated a ferromagnetic metallic ground state. This effect is attributed to the film adhesion to the substrate which prevents the lattice distortions necessary for the charge and antiferromagnetic ordering that occur in the bulk samples.
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