Karin Leistner, Juliane Wunderwald, Norman Lange, Steffen Oswald, Manuel Richter, Hongbin Zhang, Ludwig Schultz, Sebastian Fähler
Electric control of magnetism is a vision which drives intense research on magnetic semiconductors and multiferroics. Recently, also ultrathin metallic films were reported to show magnetoelectric effects at room temperature. Here we demonstrate much stronger effects by exploiting phase changes in a naturally grown oxide layer exchange coupled to an underlying ferromagnet. For the exemplarily studied FePt/iron oxide composite in an electrolyte, a large and reversible change of magnetic moment and anisotropy is obtained. The principle can be transferred to various metal/oxide combinations. It represents a novel approach towards multifunctional materials.
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http://arxiv.org/abs/1206.2467
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