Europhys. Lett.
Volume 68, Number 5, December 2004
Page(s) 726 - 732
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 05 November 2004
Europhys. Lett., 68 (5), pp. 726-732 (2004)
DOI: 10.1209/epl/i2004-10263-9

Magnetic coupling and exchange stiffness in striped $\chem{MnAs}$ films

T. Tolinski1, J. Lindner1, K. Lenz1, K. Baberschke1, A. Ney2, T. Hesjedal2, C. Pampuch2, L. Däweritz2, R. Koch2 and K. H. Ploog2

1  Institut für Experimentalphysik, Freie Universität Berlin Arnimallee 14, D-14195 Berlin, Germany
2  Paul-Drude-Institut für Festkörperelektronik Hausvogteiplatz 5-7, D-10117 Berlin, Germany

received 11 August 2004; accepted in final form 12 October 2004
published online 5 November 2004

We provide the first direct evidence of interactions in a self-organized pattern of coexisting ferromagnetic and paramagnetic $\chem{MnAs}$ stripe domains as a function of the coupling strength between the stripes (inter) and within one stripe (intra). The value of the intra exchange constant $A=17.7\times 10^{-10}$ $\un{erg/cm}$ is determined unambiguously from spin wave resonance. Additionally, in-plane ferromagnetic resonance measurements reveal the presence of a strong coupling between the neighboring stripes, which can dominate the weak intra-stripe interaction.

75.70.Ak - Magnetic properties of monolayers and thin films.
75.60.-d - Domain effects, magnetization curves, and hysteresis.

© EDP Sciences 2004