Magnetoelastic coupling

For the magnetoelastic coupling parameters (B °, By-2), the first superscript indicates the irreducible representation, the second one the degree of the harmonic polynomial in (a, ). Notice that the bracketed expressions in eq. (4) can be rewritten in a form analogous to that in eq. (3a) ... 

Since thin magnetic films are deposited on a non-magnetic substrate, the actual strains, and thus the induced anisotropy, depend on the magnetoelastic coupling coefficients of... 

The elastic properties of the substrate can be determined more accurately than those of the film. Hence, in principle, the magnetoelastic coupling parameter By-2 can be determined more accurately than the magnetostriction coefficient ky-2. An analogous conclusion can be drawn with respect to bending experiments (see e.g. section 3.1 the magnetoelastic cantilever method). 

Fig. 40. A comparison of the magnetoelastic coupling coefficient of an annealed (Tb4oFego)/(FesoCoso) multilayer with the optimised Tb Fego. SmFeB (a) and (Tb gFe82)/(Fe75Co25), (TbDyFe)/(FeSiCuNbB), (Tb33Fe67)/(Fe8oB2o) (b) ones. After Ludwig and Quandt (2000).

Fig. 45. Normalised magnetoelastic coupling coefficient of a Tbo.4Feo.6f7 nm)/Feo.sCoo.5(9 nm) multilayer, as a function of external field at different temperatures. After Ludwig and Quandt (2000).

Fig. 58. Thermal variation of the magnetoelastic coupling parameter BY for the superlattices Hob/Yb) too ( ) and H03 [ /Lu 19) 30 (A), and for bulk Ho (dashed —). The dash-dotted and continuous lines are calculated (see...

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