Volume 39, Number 6, September 1997
|Page(s)||675 - 683|
|Section||Condensed matter: electronic, structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Dynamical measurements of nucleation and propagation in a domain wall junction at low temperature
Laboratoire de Magnétisme Louis Néel, CNRS, BP. 166, 38042 Grenoble Cedex
2 Laboratoire de Physique des Matériaux, Université Henri Poincaré-Nancy I, BP. 239, 54506 Vandoeuvre les Nancy Cedex, France
3 Centre de Recherche sur les Très Basses Températures, CNRS, BP. 166, 38042 Grenoble Cedex 9, France
4 Laboratoire de Microstructures et Microélectroniques, CNRS, 196 Avenue Ravera, 92220 Bagneux, France
Accepted: 29 July 1997
GdFe (1000 Å)/TbFe (e)/GdFe (500 Å) sandwiches, where the thickness e of the TbFe film can be as small as 2 Å, constitutes a Domain Wall Junction (DWJ). In this device, a domain wall, nucleated in the thicker GdFe layer, crosses an artificial energy barrier (the TbFe layer), by thermal activation (above 1 K). DWJs constitute a model system for the study of nucleation, pinning and depinning of a domain wall, in both thermal activation and quantum regimes. In the present case, quantum tunnelling of magnetisation is suggested below 0.7 K.
PACS: 75.60.Ch – Domain walls and domain structure / 75.70.-i – Magnetic films and multilayers / 75.45.+j – Macroscopic quantum phenomena in magnetic systems
© EDP Sciences, 1997
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