We investigate the magnetocaloric effect obtained by the rotation of a
magnetic field applied to an exchange-coupled multilayer system composed of two
different ferromagnetic (FM) materials. We specifically consider a system in
which the two FMs have perpendicular uniaxial anisotropy axes and utilise
conditions which yield a reorientation of the total magnetization when
compensation between the anisotropies of the two layers occurs. We calculate
the consequent entropy change associated with the "artificial" reorientation.
By using known parameters from MnBi and Co we predict an entropy change of
Ξs=0.34 Jkgβ1Kβ1 for perfect coupling. Lastly, we study the
behavior of the multilayer under a rotating magnetic field via a micromagnetic
model. When the layer thicknesses are of the order of the local domain wall
width, the magnetic field-induced entropy change can be obtained with magnetic
fields one order of magnitude lower than in the uncoupled case.Comment: 7 pages, 7 figure