Magnetoelastic effects in low-dimensional magnetic systems

Magnetic shape memory: Magnetoelastic sponges.

news & views Nevertheless, a few hurdles must be overcome before SBA dielectrics will make a significant impact on large-scale transistor manufacturing. Perhaps the biggest problem at the moment is the slow response of the sodium ions to an external electric field. Consequently, the capacitance of the SBA films is reduced at higher frequencies. Solid-polymer electrolytes typically suffer from a...

Magnetic Interactions in Low-Dimensional Iron Nanostructures

Magnetoelastic Effects in UNiAl and UCoAl

We report on strongly anisotropic thermal-expansion and magnetostriction of UNiAl and UCoAl within the frame of the 5f -electron magnetism. Both the compounds crystallize in the hexagonal ZrNiAl-type structure and exhibit huge magnetocrystalline anisotropy with the c-axis as the easy magnetization direction. UNiAl orders antiferromagnetically (TN ≈ 19 K) and exhibits a field-induced metamagneti...

Low Dimensional Hamiltonian Systems

The theory of differential forms began with a discovery of Poincaré who found conservation laws of a new type for Hamiltonian systems—The Integral Invariants. Even in the absence of non-trivial integrals of motion, there exist invariant differential forms: a symplectic two-form, or a contact one-form for geodesic flows. Some invariant forms can be naturally considered as “forms on the quotient....

Magnetoelastic coupling in epitaxial magnetic films: An ab-initio study

A method is developed which allows to determine the first-order and the second-order magnetoelastic coefficients of a magnetic bulk material from the ab-initio calculation of the magnetocrystalline anisotropy energy as function of a prestrain ǫ0. Explicit results are given for bcc Fe, and they agree well with experimental data obtained from the magnetostrictive stress measurements for epitaxial...