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Seedy magnetic order in amorphous TbCu3,54 investigated by small- and large-angle neutron scattering and by magnetic measurements

The authors have performed some measurements of magnetic susceptibility, magnetisation (H<or=150 kOe), large- and small-angle neutron scattering (SANS) at different temperatures (2.6K<T<300K) on the asperomagnetic amorphous alloy TbCu3.54. Having analytically described the SANS data, they have carefully distinguished the various scales of observation in real space as a function of the distinct scattering laws in order to reach a full description of the magnetic order over a distance extending from one AAngstrom to a few microns. They observe the existence of large magnetic domains with an average magnetisation of about 1 mu B/Tb and which have low scattering density boundaries. At intermediate distances they distinguish terbium 'bubbles' (diameter approximately 15 AA) regularly spaced ( approximately 40-50 AA) and having a magnetisation per unit volume ten times stronger than that of the surrounding matrix. They also describe the magnetic order at short distances. They present the variations of these properties with temperature and annealing. A H-1/2 dependence of the magnetisation at the approach to saturation seems to be related to the presence of the terbium bubbles. The magnetic order exhibiting 'bubbles' with strong intensity of magnetisation is called 'seedy magnetic' order.