Beating the superparamagnetic size limit of nanoparticles on a ferroelectric substrate

摘要: When decreasing the size of nanoscale magnetic particles their magnetization becomes vulnerable to thermal fluctuations as approaching superparamgnetic limit, hindering thus applications relying on a stable magnetization. Here, we show theoretically that magnetoelectric coupling ferroelectric substrate renders possible realization substantially smaller nano clusters with thermally For an estimate cluster perform calculations realistic material parameters for iron BaTiO3 substrate. We find, steering polarization electric fields affects magnetism deposited clusters. These findings point qualitatively new class superparamagnetic composites.