Magnetic Aspects and Large Exchange Bias of Ni0.9Co0.1/NiCoO Multilayers

Anyfantis, Dimitrios I.; Kanistras, Nikos; Ballani, Camillo; Barnasas, Alexandros; Kapaklis, Vassilios; Schmidt, G.; Papaioannou, Evangelos Th.; Poulopoulos, P.

doi:10.3390/micro1010005

Cited by 3 publications

(8 citation statements)

References 51 publications

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“…These results are quite similar to Ni/NiO multilayers [14]. On the other hand, the Ni 0.9 Co 0.1 /NiCoO system did not present such a large enhancement of PMA after annealing [13].…”

Section: Magnetic Characterizationsupporting

confidence: 81%

“…The Ni/NiO system showed a tendency for perpendicular magnetic anisotropy due to strain and magnetoelastic anisotropy contributions. An even stronger tendency for PMA in both systems has been observed after mild thermal treatment [13,14]. Here, the PMA enhancement is due to partial crystallization of NiO layers after annealing [14].…”

Section: Introductionmentioning

confidence: 71%

“…Similar behavior was detected in Ni/NiO multilayers with a dopant of Co of the order of 10% at. [13]. In the inset, the magnification of the data near zero magnetic field for a sample with t NiFe = 2.7 nm is shown, which presents inverted hysteresis with negative remanence.…”

Section: Magnetic Characterizationmentioning

confidence: 95%

“…Then the next temperature was set in the maximum field and a hysteresis loop was recorded in the same way. In such a way, we excluded any experimental factor that could influence the magnetization reversal [13].…”

Section: Methodsmentioning

confidence: 99%

“…With the use of a single magnetron sputtering head and natural oxidation, we recently demonstrated an efficient technique to produce Ni/NiO and NiCo/NiCoO multilayers with excellent stacking at the nanoscale and an ultrathin amorphous oxide layer of constant thickness (of about 1.4 ± 0.2 nm) [11][12][13]. The Ni/NiO system showed a tendency for perpendicular magnetic anisotropy due to strain and magnetoelastic anisotropy contributions.…”

Section: Introductionmentioning

confidence: 99%

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Growth, Magnetic Anisotropies and Exchange Bias of Thin Ni0.95Fe0.05/NiFeO Multilayers

et al. 2022

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Ni0.95Fe0.05/NiFeO multilayers were fabricated by radio frequency magnetron sputtering and natural oxidation. Doping of Ni by only 5 at. % Fe results in enhanced layering quality as X-ray reflectivity reveals. Due to magnetostatic anisotropy, the multilayers were found to be in-plane magnetized. The influence of mild thermal annealing (T = 525 K) on the magnetic properties of NiFe/NiFeO multilayers is also investigated. Annealing results in the enhancement of perpendicular magnetic anisotropy, mainly due to an increase in the uniaxial volume anisotropy term. Temperature-dependent hysteresis measurements between 4–400 K revealed considerable enhancement of coercivity and appearance of exchange bias effect.

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“…These results are quite similar to Ni/NiO multilayers [14]. On the other hand, the Ni 0.9 Co 0.1 /NiCoO system did not present such a large enhancement of PMA after annealing [13].…”

Section: Magnetic Characterizationsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 71%

Section: Magnetic Characterizationmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth, Magnetic Anisotropies and Exchange Bias of Thin Ni0.95Fe0.05/NiFeO Multilayers

et al. 2022

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Magnetic Anisotropies and Exchange Bias of Co/CoO Multilayers with Intermediate Ultrathin Pt Layers

et al. 2023

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Co/CoO multilayers are fabricated by means of radio-frequency magnetron sputtering. For the formation of each multilayer period, a Co layer is initially produced followed by natural oxidation. Platinum is used not only as buffer and capping layers, but also in the form of intermediate ultrathin layers to enhance perpendicular magnetic anisotropy. Three samples are compared with respect to the magnetic anisotropies and exchange bias between 4–300 K based on superconducting quantum interference device magnetometry measurements. Two of the multilayers are identical Co/CoO/Pt ones; one of them, however, is grown on a Co/Pt “magnetic substrate” to induce perpendicular magnetic anisotropy via exchange coupling through an ultrathin Pt intermediate layer. The third multilayer is of the form Co/CoO/Co/Pt. The use of a “magnetic substrate” results in the observation of loops with large remanence when the field applies perpendicular to the film plane. The CoO/Co interfaces lead to a significant exchange bias at low temperatures after field cooling. The largest exchange bias was observed in the film with double Co/CoO/Co interfaces. Consequently, significant perpendicular anisotropy coexists with large exchange bias, especially at low temperatures. Such samples can be potentially useful for applications related to spintronics and magnetic storage.

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Influence of Pt Ultrathin Interlayers on Magnetic Anisotropy in Ni/NiO Multilayers

Anyfantis,

Barnasas,

Diamantopoulos

et al. 2024

Micro

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Perpendicular magnetic anisotropy at transition metal/oxide interfaces plays a significant role in technological applications such as magnetic storage and spintronics. In this study, we investigate the effects of thermal annealing and Pt ultrathin interlayers on the magnetic anisotropy in Ni/NiO multilayers. Ni/NiO/Pt multilayers were fabricated via radiofrequency magnetron sputtering and natural oxidation. The static magnetic properties of the samples were studied using temperature-dependent SQUID magnetometry. We focus on a sample with a Nickel thickness of 6.7 nm in each multilayer period. This multilayer in Ni/NiO form showed the maximum enhancement of perpendicular magnetic anisotropy after mild thermal annealing in past work. In this work, we study the effects of ultrathin Pt interlayers on the magnetic properties of such a Ni/NiO multilayer before and after annealing. We have observed a further increase in perpendicular magnetic anisotropy, and we study the temperature-dependent magnetic properties of this system, which combines the favorable magnetic properties of Ni/Pt and Ni/NiO multilayers.

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Magnetic Aspects and Large Exchange Bias of Ni0.9Co0.1/NiCoO Multilayers

Cited by 3 publications

References 51 publications

Growth, Magnetic Anisotropies and Exchange Bias of Thin Ni0.95Fe0.05/NiFeO Multilayers

Growth, Magnetic Anisotropies and Exchange Bias of Thin Ni0.95Fe0.05/NiFeO Multilayers

Magnetic Anisotropies and Exchange Bias of Co/CoO Multilayers with Intermediate Ultrathin Pt Layers

Influence of Pt Ultrathin Interlayers on Magnetic Anisotropy in Ni/NiO Multilayers

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