We report on the exchange coupling and magnetic properties of a strained ultrathin CoO/PtFe double-layer with perpendicular magnetic anisotropy. The cobalt oxide growth by reactive molecular beam epitaxy on a Pt-terminated PtFe/Pt(001) surface gives rise to an hexagonal surface and a monoclinic distorted CoO 3nm film at room temperature. This distorted ultrathin CoO layer couples with the PtFe(001) layer establishing a robust perpendicular exchange bias shift. Soft x-ray absorption spectroscopy provides a full description of the spin orientations in the CoO/PtFe doublelayer. The exchange bias shift is preserved up to the Neel antiferromagnetic ordering temperature of TN=293 K. This unique example of selfsame value for blocking and ordering temperatures, yet identical to the bulk ordering temperature, is likely related to the original strain induced distortion and strengthened interaction between the two well-ordered spin layers.
翻译:我们报告了一个压力超强超硬质COO/PtFe双层与穿孔磁性活性激素的交换结合和磁特性。在Pt-终止的PtFe/Pt(001)表面,反应分子束反射氧化钴的增殖在Pt-终止的PtFe/Pt(001)表面形成一个六角表面,并在室温下产生一个单一的扭曲的COO 3nm胶片。这种扭曲的超硬质COO 层夫妇与PtFe(001) 层建立了强大的垂直交换偏移偏移。软X光吸收光谱谱全面描述了COO/PtFe双层的旋转方向。这种交换偏移保留在Neel 抗倍磁性定温度TNT=293K上。这个阻挡和命令温度的自相值的独特例子,但与大命令温度相同,可能与最初的压力诱导扭曲和两个有序的螺旋层之间加强相互作用有关。