In-situ study of exchange-bias in interlayer coupled Co/CoO/Co trilayer structure

Singh, Sadhana; Kumar, Pawan; Gupta, Ajay; Kumar, Dileep

doi:10.1016/j.jmmm.2020.167186

Cited by 5 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Singh et al, e.g., studied the exchange bias in Co/CoO/Co trilayer systems. They found two-step rounded hysteresis loops due to different thicknesses and thus different coercive fields of the top layer, as compared to the bottom Co layer, and at low temperatures different asymmetries of the coercive fields for different top layer thicknesses [15].…”

Section: Traditional Thin Film Systems 41 Co/coo Thin Film Systemsmentioning

confidence: 99%

“…While first studies concentrated on relatively simple FM/AFM combinations, such as the aforementioned Co/CoO [3,4], Fe/FeF 2 [5,6], or Fe/MnF 2 [7,8], which already exhibited quite interesting effects for the different materials, nowadays more complicated materials are under investigations, such as Fe/LaAlO 3 [9] or Pr 0.67 Sr 0.33 MnO 3 /SrTiO 3 [10], and more sophisticated structures, such as nanostructures [11][12][13] or multi-layer sandwiches [14,15]. Still, at the same time, new models are being developed to understand the exchange bias effect, which is already intensively used in magnetic data storage, qualitatively and quantitatively for all these different material combinations and structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exchange Bias in Thin Films—An Update

Błachowicz

Ehrmann

2021

Coatings

View full text Add to dashboard Cite

The exchange bias (EB) is an effect occurring in coupled ferromagnetic/antiferromagnetic materials of diverse shapes, from core–shell nanoparticles to stacked nanostructures and thin films. The interface coupling typically results in a horizontal—often also vertical—shift of the hysteresis loop, combined with an increased coercivity, as compared to the pure ferromagnet, and the possibility of asymmetric hysteresis loops. Several models have been developed since its discovery in 1956 which still have some drawbacks and some unexplained points, while exchange bias systems are at the same time being used in hard drive read heads and are part of highly important elements for spintronics applications. Here, we give an update of new theoretical models and experimental findings regarding exchange bias phenomena in thin films during the last years, including new material combinations in which an exchange bias was found.

show abstract

Section: Traditional Thin Film Systems 41 Co/coo Thin Film Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exchange Bias in Thin Films—An Update

Błachowicz

Ehrmann

2021

Coatings

View full text Add to dashboard Cite

show abstract

“…Various Co/CoO films typically show relatively small exchange bias field (<3000 Oe), [13,32,[37][38][39][40][41][42][43][44][45] while our samples show unusually large H EB . To better understand the enhanced EB, we performed a simulation with atomistic spin models subjected to Landau-Lifshitz-Gilbert-Brown equation:…”

Section: Resultsmentioning

confidence: 71%

Large and Robust Exchange Bias in Co/CoO film: Implication for Flexible Spintronics

Sun

Tang

Chen

et al. 2022

Advanced Physics Research

View full text Add to dashboard Cite

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.

show abstract

“…Therefore, it is difficult to study unambiguous effect of roughness on peculiar magnetic properties. In-situ measurements under ultra-high vacuum (UHV) condition is more useful to obtain a genuine property of thin magnetic layer itself without an over layer [11][14] [22] [23]. Furthermore, it also provides detailed thickness dependence information from same sample [18] [24] In the present work, the effect of substrate surface roughness on the growth of Co film with thickness ranging from fraction of nanometer to several nanometer, has been studied using combined in-situ magneto-optical Kerr effect (MOKE) and four probe resistivity measurements.…”

Section: Introductionmentioning

confidence: 99%