Nucleation Experiments on Thin Magnetic MnBi Films

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Abstract
Experiments devised to provide information about the nucleation probability of ferromagnetic MnBi films are described. These experiments revealed that uniform magnetic MnBi films grow from only a few randomly distributed nucleation sites. Thus nucleation is of considerable importance in the preparation of magnetic MnBi films. Further studies aimed at controlling this nucleation behavior are therefore indicated. First experiments directed toward this goal showed that 100% nucleation occurs if the Mn-Bi layer which is to be transformed is deposited on an already formed magnetic MnBi film. The magnetic field of this pre-magnetized MnBi film substrate is the cause for the development of extremely large domains but the high efficiency of nucleation seems to stem simply from the direct contact with the already finished MnBi film substrate.

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