Grain size of MnBi films |
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Authors: | W K Unger H Harms |
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Institution: | (1) Forschungslaboratorien der Siemens AG, D-8000 München 80, Fed. Rep. Germany |
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Abstract: | MnBi films were prepared by annealing Bi-Mn composite films. The grain size of the MnBi films was strongly influenced by the
temperatureT
s
of the film substrate during evaporation of Bi and Mn. For 55-nm-thick films, the numberN of MnBi grains per mm2 decreased from 4×106 per mm2 forT
s
=+90°C to 1 per mm2 forT
s
=−40°C. The diameters of the largest grains observed were about 5 mm. For interpretation of this result, the formation process
of MnBi films was observed magneto-optically and electronmicroscopically. It was found thatN was determined by the structure of Bi in the Bi-Mn composite films and that this strongly depended onT
s
. |
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Keywords: | Thin films MnBi |
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