By K.H.J. Buschow Ph.D.
Bankruptcy one encompasses a designated account of achievements on infrequent earth dependent man made multilayered constructions. the big physique of experimental effects that experience turn into to be had for the numerous intermetallic compounds within which infrequent earths are mixed with 3d transition metals is defined within the moment bankruptcy. The ferrites shape a wide type of magnetic fabrics and a few of those fabrics are of substantial technical significance. New effects bought on ferrites are defined in bankruptcy 3, the place the emphasis is on spinel ferrites. prior volumes have contained chapters at the workforce of so known as gentle magnetic fabrics. Supplementary effects dealing more often than not with laminated amorphous alloys and electric steels and the matter of the loss generating impression of the rotational magnetisation are highlighted in bankruptcy 4. bankruptcy 5 maintains the updating approach all started within the prior quantity of the fundamental magnetic interactions of infrequent earth intermetallics, dealing specifically with infrequent earth copper compounds of the kind RCu2.
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Bankruptcy one includes a specific account of achievements on infrequent earth established man made multilayered buildings. the big physique of experimental effects that experience develop into on hand for the various intermetallic compounds during which infrequent earths are mixed with 3d transition metals is defined within the moment bankruptcy.
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1985b). 2 t/NGd Fig. 15. (a) Linear dependence of the spontaneous moment 0-(0) and (b) the excess moment A~r = o'(15) - ~(0) on the inverse of the number of Gd planes in a bilayer of superlattices with 5, 10, and 20 Gd planes. Data for a Gd film are also shown. The Curie temperatures of the superlattlces deviate very little from the bulk value of 293 K except for the 5 plane sample that shows a lower Tc possibly from alloying effects (after Kwo et al. 1985b). ÷i I I I I /5 ÷ i i I I %' e 1 / \ /~ , 5 i 0 I I i :,, p t t0 20 N y ( ATOM IC LAYERS) 30 Fig.
The strains induced by epitaxy could in fact perturb the band structure. These studies have provided new insight into the interplay of magnetoelastic and exchange interactions in rare earths. The most striking result of the epitaxial clamping to the substrate and intervening non-magnetic layers is the suppression or enhancement of the ferromagnetic transitions found in bulk Dy and Er. The helical and linear spin density wave orderings are also significantly perturbed. For example, in the [Dy]Y] superlattices the temperature dependence of the interlayer turn angle is weakened as the elastic clamping is increased, while in [DylLu ] and [DylSc] superlattices the initial turn angle near the Nrel temperature is much smaller than in bulk Dy.
Also the effective clamping parameters and non-magnetic strains, ~'0, may depend sensitively on the growth conditions. There are not yet data for the anomalous growth plane strains for Dy multilayers where rz is expected to be of order 1 or greater. From clamping considerations the anomalous strain along the c-axis should be ezz = Kz/c33. The measured c-axis anomalous strain in Dy superlattices (Erwin et al. 1987) is approximately 44- 1 x 10 -3 at low temperatures, while the calculated value is 6 x 10 -3 for w = 30 °.