Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 478, Issue -, Pages 170-174Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2019.01.104
Keywords
Magnetic properties of interfaces; Magnetic anisotropy; Micromagnetic simulations; Exchange interactions: magnetically ordered materials; Hysteresis in magnetism
Funding
- Brazilian Foundation CNPq [402013/2016-6, 104289/2018-0]
- Generalitat de Catalunya [2017-SGR-292]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [665919]
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Training is a common effect in exchange bias systems and accounts for the decrease of the exchange bias loop shift and coercivity with consecutively measured hysteresis loops until steady values. This is an ageing-like phenomenon that is related to the metastable state of the ferromagnetic/antiferromagnetic interface after field cooling. However, its origin still remains intriguing and not univoquely established. Here, by micromagnetic simulations considering discrete non-interacting antiferromagnetic grains embedded in a ferromagnetic matrix, it is demonstrated that the origin of training in granular Co-CoO exchange bias systems prepared by 0 ion implantation into Co thin films is linked to the perpendicular anisotropy of rotatable interface uncompensated spins. The simulations are compared to experimental data as reported in Physical Review B 89 (2014) 144407. The out-of-plane nature of the rotatable anisotropy of the system is also responsible for the magnetic reversal asymmetry between the first and the second magnetic reversals, evidencing the interconnection between training and magnetization reversal, suggesting that training effect and magnetization reversal asymmetry are ultimately interconnected through perpendicular anisotropy.
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