Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502, 91405 Orsay Cedex, France.
Phys Rev Lett. 2009 Dec 18;103(25):257601. doi: 10.1103/PhysRevLett.103.257601. Epub 2009 Dec 14.
We report here that a Permalloy layer deposited on top of a multiferroic BiFeO3 single crystal acquires an easy magnetic direction along the propagation vector of the cycloidal arrangement of antiferromagnetic moments in BiFeO3. This anisotropy originates from a direct magnetic coupling with the canted spins forming the cycloid. Moreover, we show that an electric field-induced change of electric polarization is able to toggle the direction of anisotropy in the ferromagnet through the magnetoelectric effect, which links the antiferromagnetic spins to the local polarization in BiFeO3.
我们在这里报告，沉积在多铁性 BiFeO3 单晶上的坡莫合金层获得了沿 BiFeO3 中反铁磁矩的旋错排列的传播矢量方向的易磁化方向。这种各向异性源于与形成旋错的倾斜自旋的直接磁耦合。此外，我们表明，通过磁电效应，电场诱导的电极化变化能够通过将反铁磁自旋与 BiFeO3 中的局部极化联系起来，从而翻转铁磁体中的各向异性方向。
