Kuświk Piotr, Gaul Alexander, Urbaniak Maciej, Schmidt Marek, Aleksiejew Jacek, Ehresmann Arno, Stobiecki Feliks
Institute of Molecular Physics, Polish Academy of Sciences, 1760179 Poznań, Poland.
Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, 34125 Kassel, Germany.
Nanomaterials (Basel). 2018 Oct 10;8(10):813. doi: 10.3390/nano8100813.
Here, we systematically investigated the influence of ion bombardment with different fluences on the strength and direction of the exchange bias coupling in Au/Co/NiO systems with perpendicular magnetic anisotropy of the Co layer. We found that the direction of the exchange bias coupling can be reversed as a result of ion bombardment performed in an external magnetic field which is in the opposite direction to the magnetic field applied during film deposition. Moreover, the strength of the exchange bias coupling can be tailored by varying the ion fluence. These results show behaviors similar to the results found for systems of ferromagnetic layers with in-plane anisotropy. Our experimental work, supported by a two-energy-level model, demonstrates that exchange bias coupling can be tuned in a layered system with perpendicular magnetic anisotropy using ion bombardment.
在此，我们系统地研究了不同注量的离子轰击对具有垂直磁各向异性的Co层的Au/Co/NiO体系中交换偏置耦合的强度和方向的影响。我们发现，在与薄膜沉积过程中所施加磁场相反方向的外磁场中进行离子轰击，可使交换偏置耦合的方向发生反转。此外，通过改变离子注量，可以调整交换偏置耦合的强度。这些结果显示出与具有面内各向异性的铁磁层体系的结果相似的行为。我们的实验工作在双能级模型的支持下表明，使用离子轰击可以在具有垂直磁各向异性的层状体系中调节交换偏置耦合。
