Tunable magnetic anisotropy of antiferromagnetic NiO in (Fe)/NiO/MgO/Cr/MgO(001) epitaxial multilayers

Janus, W.; Ślęzak, T.; Ślęzak, M.; Szpytma, M.; Dróżdż, P.; Nayyef, H.; Mandziak, Anna; Wilgocka-Ślęzak, D.; Zając, M.; Jugovac, Matteo; Menteş, Tevfik Onur; Locatelli, Andrea; Kozioł–Rachwał, A.

doi:10.1038/s41598-023-31930-z

Cited by 6 publications

(2 citation statements)

References 51 publications

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“…The inset in Fig. 3 b provides direct confirmation of these conclusions, namely the 80 K results obtained using X-ray Magnetic Linear Dichroism (XMLD) 46 , 47 measurements at the PIRX beamline 48 of National Synchrotron Radiation Centre Solaris in Kraków 49 . In case of AFM CoO, the XMLD magnitude is routinely defined by the so called R L3 ratio of the two selected out of four peaks of intensity around L3 absorption edge of Co in X-ray absorption spectra 7 , please see Fig.…”

Section: Resultssupporting

confidence: 70%

Tunable interplay between exchange coupling and uniaxial magnetic anisotropy in epitaxial CoO/Au/Fe trilayers

Nayyef

Świerkosz

Janus

et al. 2023

Sci Rep

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We show that the interaction between ferromagnetic Fe(110) and antiferromagnetic CoO(111) sublayers can be mediated and precisely tuned by a nonmagnetic Au spacer. Our results prove that the thickness of the Fe and Au layers can be chosen to modify the effective anisotropy of the Fe layer and the strength of the exchange bias interaction between Fe and CoO sublayers. Well-defined and tailorable magnetic anisotropy of the ferromagnet above Néel temperature of the antiferromagnet is a determining factor that governs exchange bias and interfacial CoO spins orientation at low temperatures. In particular, depending on the room temperature magnetic state of Fe, the low-temperature exchange bias in a zero-field cooled system can be turned “off” or “on”. The other way around, we show that exchange bias can be the dominating magnetic anisotropy source for the ferromagnet and it is feasible to induce a 90-degree rotation of the easy axis as compared to the initial, exchange bias-free easy axis orientation.

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Section: Resultssupporting

confidence: 70%

Tunable interplay between exchange coupling and uniaxial magnetic anisotropy in epitaxial CoO/Au/Fe trilayers

Nayyef

Świerkosz

Janus

et al. 2023

Sci Rep

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“…After 600 cycles, this anode material delivered a high capacity of ~1900 mAh g −1 , which is much higher than the theoretical capacity of ~1000 mAh g −1 . The NiO nanostructure also received great attention for its various electrical/optical applications, including capacitors, gas sensors, solar cells, and magnetic applications [36][37][38][39][40]. NiO has a theoretical capacity of ~720 mAh g −1 , which is more than twice that of graphene [41].…”

Section: Introductionmentioning

confidence: 99%

Film Thickness Effect in Restructuring NiO into LiNiO2 Anode for Highly Stable Lithium-Ion Batteries

Nguyen,

Kim

2024

Batteries

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The long-term stability of energy-storage devices for green energy has received significant attention. Lithium-ion batteries (LIBs) based on materials such as metal oxides, Si, Sb, and Sn have shown superior energy density and stability owing to their intrinsic properties and the support of conductive carbon, graphene, or graphene oxides. Abnormal capacities have been recorded for some transition metal oxides, such as NiO, Fe2O3, and MnO/Mn3O4. Recently, the restructuring of NiO into LiNiO2 anode materials has yielded an ultrastable anode for LIBs. Herein, the effect of the thin film thickness on the restructuring of the NiO anode was investigated. Different electrode thicknesses required different numbers of cycles for restructuring, resulting in significant changes in the reconstituted cells. NiO thicknesses greater than 39 μm reduced the capacity to 570 mAh g−1. The results revealed the limitation of the layered thickness owing to the low diffusion efficiency of Li ions in the thick layers, resulting in non-uniformity of the restructured LiNiO2. The NiO anode with a thickness of approximately 20 μm required only 220 cycles to be restructured at 0.5 A g−1, while maintaining a high-rate performance for over 500 cycles at 1.0 A g−1, and a high capacity of 1000 mAh g−1.

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From Magnetostatics to Topology: Antiferromagnetic Vortex States in NiO‐Fe Nanostructures

Ślęzak,

Wagner,

Bharadwaj

et al. 2024

Adv Materials Inter

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Magnetic vortices are topological spin structures frequently found in ferromagnets, yet novel to antiferromagnets. By combining experiment and theory, it is demonstrated that in a nanostructured antiferromagnetic‐ferromagnetic NiO(111)‐Fe(110) bilayer, a magnetic vortex is naturally stabilized by magnetostatic interactions in the ferromagnet and is imprinted onto the adjacent antiferromagnet via interface exchange coupling. Micromagnetic simulations are used to construct a corresponding phase diagram of the stability of the imprinted antiferromagnetic vortex state. The in‐depth analysis reveals that the interplay between interface exchange coupling and the antiferromagnet magnetic anisotropy plays a crucial role in locally reorienting the Néel vector out‐of‐plane in the prototypical in‐plane antiferromagnet NiO and thereby stabilizing the vortices in the antiferromagnet.

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Tunable magnetic anisotropy of antiferromagnetic NiO in (Fe)/NiO/MgO/Cr/MgO(001) epitaxial multilayers

Cited by 6 publications

References 51 publications

Tunable interplay between exchange coupling and uniaxial magnetic anisotropy in epitaxial CoO/Au/Fe trilayers

Tunable interplay between exchange coupling and uniaxial magnetic anisotropy in epitaxial CoO/Au/Fe trilayers

Film Thickness Effect in Restructuring NiO into LiNiO2 Anode for Highly Stable Lithium-Ion Batteries

From Magnetostatics to Topology: Antiferromagnetic Vortex States in NiO‐Fe Nanostructures

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