Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 2: Magnetische Dünne Schichten I

MA 2.9: Vortrag

Montag, 24. März 2003, 12:15–12:30, HSZ/04

Finite-size effect on magnetic ordering temperatures in long-period antiferromagnets: thin holmium films — •E. Schierle¹, H. Ott¹, C. Schüßler-Langeheine^1,2, G. Kaindl¹, E. Weschke¹, V. Leiner^3,4, H. Zabel³, and P. Jensen⁵ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — ²Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany — ³II. Physikalisches Institut, Universiät zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany — ⁴LSS, Institut Laue Langevin, F-38042 Grenoble Cédex, Fance — ⁵Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

The helical antiferromagnetic structure of monocrystalline thin Ho metal films was studied by magnetic resonant soft x-ray and neutron scattering, revealing a thickness dependence of the ordering temperature T_N according to [T_N (∞)−T_N(d)]/T_N (d)∝ (d−d₀)^−λ′ with a finite thickness d₀ of the order of the bulk helix period. This behavior is explained within a mean field model, revealing a linear dependence of d₀ on the period length of the magnetic superstructure in the bulk material.