Faculty of Physics and Applied Computer Science, AGH University of Krakow, Kraków, Poland.
National Synchrotron Radiation Centre SOLARIS, Jagiellonian University, Kraków, Poland.
Sci Rep. 2023 Jul 5;13(1):10902. doi: 10.1038/s41598-023-38098-6.
We show that the interaction between ferromagnetic Fe(110) and antiferromagnetic CoO(111) sublayers can be mediated and precisely tuned by a nonmagnetic Au spacer. Our results prove that the thickness of the Fe and Au layers can be chosen to modify the effective anisotropy of the Fe layer and the strength of the exchange bias interaction between Fe and CoO sublayers. Well-defined and tailorable magnetic anisotropy of the ferromagnet above Néel temperature of the antiferromagnet is a determining factor that governs exchange bias and interfacial CoO spins orientation at low temperatures. In particular, depending on the room temperature magnetic state of Fe, the low-temperature exchange bias in a zero-field cooled system can be turned "off" or "on". The other way around, we show that exchange bias can be the dominating magnetic anisotropy source for the ferromagnet and it is feasible to induce a 90-degree rotation of the easy axis as compared to the initial, exchange bias-free easy axis orientation.
我们证明，非磁性 Au 间隔层可以介导并精确调节铁磁 Fe(110)和反铁磁 CoO(111)亚层之间的相互作用。我们的结果证明，可以选择 Fe 和 Au 层的厚度来改变 Fe 层的有效各向异性和 Fe 与 CoO 亚层之间的交换偏置相互作用的强度。在反铁磁体的尼尔温度以上，铁磁体具有明确且可调节的磁各向异性，是控制交换偏置和低温下界面 CoO 自旋取向的决定因素。特别是，根据 Fe 在室温下的磁状态，零场冷却系统中的低温交换偏置可以“关闭”或“打开”。另一方面，我们表明，交换偏置可以成为铁磁体的主要磁各向异性源，并且可以诱导相对于初始无交换偏置的易轴方向进行 90 度的旋转。
