A Physical Model of a Smart Magneto-Composite Material and the   Methodology of Research of the Elastic Properties of Nano Magnetic Composite   Materials
  In this study, we show that any system consisting of magnetic dipoles forming ordered or disordered configurations can be simplified to a form mathematically equivalent to a system consisting of two magnetic dipoles. It is shown that the energy of all kinds of magnetic dipole systems can be written as $E=\frac{\beta}{\alpha^3}$, where $\alpha$ is the nearest distance between the dipoles and $\beta$ is a certain constant depending on the magnetic moments of dipoles and configuration. Using this fact we model any nano-magnetic composite material by a simple two-magnetic dipole system. Then we experimentaly and theoreticaly show that under certain conditions the elastic properties of the composite material can be changed using exernal magnetic field which leads to creation of smart composite materials. 
Igor Dimitrov, Ula\c{s} Din\c{c}
cond-mat.mtrl-sci