Large and Robust Exchange Bias in Co/CoO film: Implication for Flexible Spintronics. Issue 1 (14th December 2022)

• Record Type: Journal Article
• Authors: Sun, Yuting; Tang, Wei; Chen, Siliang; Liu, Liang; Liu, Haoliang; Ge, Jun‐Yi; Zhang, Xi; Jiang, Wei‐Chao; Liang, Huawei; Zeng, Yu‐Jia
• Is Part Of: ADVANCED PHYSICS RESEARCH. Volume 2:Issue 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-14
• Subjects: Co/CoO -- exchange bias -- Ferromagnetic /antiferromagnetic film -- flexible spintronics -- magnetism; 530
• DOI: 10.1002/apxr.202200066
• Languages: English
• ISSNs: 2751-1200

Abstract

Abstract: Developing a robust and flexible exchange bias (EB) system is crucial for wearable spintronic devices. In this work, large and robust EB effect is demonstrated in flexible Co/CoO thin films grown by magnetron sputtering. The obtained EB field is as large as 6172 Oe at low temperatures on a flexible substrate. Based on the atomistic spin models, the unexpectedly large EB field is explained by the decrease of ferromagnetic grain size and the increase of ferromagnetic /antiferromagnetic contact area. Furthermore, the strain‐dependent coercivity and EB effect are observed in flexible Co/CoO films. Finally, the flexible Co/CoO thin film shows no degradation (even a slight increase) of performances in all figures of merit after 500 bending cycles, indicating excellent mechanical durability. This study sheds light on Co/CoO as a robust EB material for flexible spintronics. Abstract : Large and robust exchange bias effect is demonstrated in flexible Co/CoO thin films. The obtained exchange bias field is as large as 6172 Oe at low temperature. Based on the atomistic spin models, the unexpectedly large exchange bias field is explained by the decrease of ferromagnetic grain size and the increase of ferromagnetic/antiferromagnetic contact area.