| 摘要 |
The present invention relates to a method for preparing a sample of a magnetic composition, comprising the provision of a vertical magnetic induction B which presents a magnetic induction gradient dB/dz and which is such that the quantity B x dB/dz has a sign opposite to that of the weight of the sample and such that the magnetic force ( chi x B x dB/dz)/ mu o is higher than the weight, and the heating at a temperature close to the melting temperature.
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