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MA: Magnetismus

MA 22: Magnetische Anisotropie

MA 22.5: Vortrag

Freitag, 15. März 2002, 13:00–13:15, H22

Magnetic and electron-spin-resonance properties of MnCr₂S₄ ferrimagnetic single crystals — •V. Tsurkan^1,2, M. Mücksch¹, H.-A. Krug von Nidda¹, J. Hemberger¹, A. Loidl¹, and R. Tidecks¹ — ¹Institute of Physics, University of Augsburg, Universitaetsstrasse 1, D-86159, Augsburg, Germany — ²Institute of Applied Physics, Moldova Academy of Sciences, Chisinau, MD-2028, R. Moldova

Magnetization and electron-spin-resonance studies of MnCr₂S₄ single crystals revealed a positive magneto-crystalline anisotropy below the Curie temperature (65K). For decreasing temperature, the resonance lines are shifted toward low fields for the easy magnetization direction, <001>. Resonance fields for the hard directions, <110> and <111>, show a non-monotonic temperature dependence with a shift toward low fields in the range 65- 50 K and toward high fields for T lower than 40 K. Below 12 K a difference in ZFC and FC magnetizations appears with an additional anomaly in FC at 5K. The origin of the observed behaviour of magnetic properties is discussed in the framework of a complex spin configuration of the Mn sublattice and a structural transformation.