Volume 72, Number 3, November 2005
|Page(s)||479 - 485|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||30 September 2005|
From ferro- to antiferromagnetism via exchange-striction of
Paul-Drude-Institut für Festkörperelektronik - Hausvogteiplatz 5-7 D-10117 Berlin, Germany
Corresponding author: email@example.com
Accepted: 8 September 2005
We investigated the stress evolution in single-crystal films on upon applying high external magnetic fields in the phase transition regime (10–40 °C) and beyond. Our stress measurements reveal large field-induced lattice distortions at temperatures, where β- is present, even well above the phase transition (C). A quantitative comparison with the field-induced increase of magnetization reveals that the changes in the lattice dimensions can be fully explained by the (reversible) back-transformation of β- to α-. Our direction-dependent experiments identify the structural distortions at the phase transition as a volume magnetostriction effect and —due to the persisting magnetocrystalline anisotropy above C— strongly support an antiferromagnetic state for β-
PACS: 75.70.Ak – Magnetic properties of monolayers and thin films / 68.60.Bs – Mechanical and acoustical properties / 75.80.+q – Magnetomechanical and magnetoelectric effects, magnetostriction
© EDP Sciences, 2005
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