Tailoring Perpendicular Exchange Bias Coupling in Au/Co/NiO Systems by Ion Bombardment

Nanomaterials

Maciej Urbaniak¹  Piotr Kuświk¹  Marek Schmidt¹  Feliks Stobiecki¹  Jacek Aleksiejew¹  Arno Ehresmann²  Alexander Gaul² 

[1] 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;

关键词: exchange bias;    perpendicular magnetic anisotropy;    ion bombardment;   

DOI  :  10.3390/nano8100813

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown