Local Manipulation of Skyrmion Nucleation in Microscale Areas of a Thin Film with Nitrogen-Ion Implantation

Zhao, Yuzhen; Wang, Junlin; Xu, Lianxin; Yu, Peiyue; Hou, Mingxuan; Meng, Fancheng; Xie, Shuai; Meng, Ying; Zhu, Ronggui; Hou, Zhipeng; Yang, Meiyin; Luo, Jun; Wu, Jing; Xu, Yongbing; Gao, Xingsen; Feng, Chun; Yu, Guo

doi:10.1021/acsami.3c00266

Cited by 4 publications

(4 citation statements)

References 58 publications

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“…These findings provide a possible method for development of skyrmion-based racetrack memory. Moreover, Zhao et al [70] produced appropriate defects in Ta/[Pt/Co/Ta] 12 multilayer with using N + implantation, which affects orbital hybridization between Co-3d and Pt-5d at Pt/Co interface and weakens the magnetic anisotropy and Heisenberg exchange interaction. In addition, DW energy significantly reduces and DMI constant D decreases from 0.49 to 0.22 mJ m −2 .…”

Section: Effect Of Ion Implantation On I-dmimentioning

confidence: 99%

Regulation of interfacial Dzyaloshinskii−Moriya interaction in ferromagnetic multilayers

Meng,

Hou

et al. 2024

J. Phys.: Condens. Matter

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Interfacial Dzyaloshinskii-Moriya interaction (i-DMI) exists in the film materials with inversion symmetry breaking, which can stabilize a series of nonlinear spin structures and control their chirality, such as Néel-type domain wall, magnetic skyrmion and spin spiral. In addition, the strength and chirality of i-DMI are directly related to the dynamic behavior of these nonlinear spin structures. Therefore, regulating the strength and chirality of i-DMI not only has an important scientific significance for enriching spintronics and topological physics, but also has a significant practical value for constructing a new generation of memorizer, logic gate, and brain-like devices with low-power. This review summarizes the research progress on the regulation of i-DMI in ferromagnetic films and provides some prospects for future research.

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Section: Effect Of Ion Implantation On I-dmimentioning

confidence: 99%

Regulation of interfacial Dzyaloshinskii−Moriya interaction in ferromagnetic multilayers

Meng,

Hou

et al. 2024

J. Phys.: Condens. Matter

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“…[13][14][15] A large number of tools to control the size, density, and motion of skyrmions have been reported, for example, laser exposure, deformation, electric current, as well as ion implantation and thermal annealing. [10,11,[14][15][16][17][18][19][20] Against this background, there is also а great interest in Co/Pd thin films and alloys, which also are attributive of both perpendicular magnetic anisotropy and high DMI values. In refs.…”

Section: Introductionmentioning

confidence: 99%

“…[ 13–15 ] A large number of tools to control the size, density, and motion of skyrmions have been reported, for example, laser exposure, deformation, electric current, as well as ion implantation and thermal annealing. [ 10,11,14–20 ]…”

Section: Introductionmentioning

confidence: 99%

Exotic Topological Magnetic States in Thin Co/Pd Ferromagnetic Films

Dorokhin,

Ved,

Kalentyeva

et al. 2024

Annalen der Physik

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Thin ferromagnet/heavy metal multilayer films are considered as prospective media for a magnetic recording and Co/Pd films are a good example of such materials. In this work, the magnetic properties and micromagnetic structure of Co/Pd multilayer films are studied with different bilayer thicknesses ([Co(0.3 × t nm)/Pd(0.5 × t nm)]10), but with the same ratio Co versus Pd. Transmission electron microscope and X‐ray diffraction studies allow authors to suppose that the investigated films are highly mixed alloys. Magnetic force microscopy and Lorentz transmission electron microscopy showed the presence of various micromagnetic features in the films. Along with skyrmions that are well‐known magnetic topological artifacts some new features are revealed, which are interpreted as 360° domain walls, skyrmioniums and the combination of the above two. It is found that the type and density of micromagnetic features strongly depend on the bilayer thickness parameter (t). The effect is associated with the peculiarities of interfacial magnetic interactions in the samples with highly mixed interfaces. The tooling coefficient represents a useful tool of the electron beam evaporation technique enabling wide manipulation of micromagnetic particles, in particular, skyrmioniums that are currently considered a prospective media for current driven magnetic recording.

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“…• Reactive Ion Irradiation: While this thesis primarily centres on inert ion irradiation, it would be intriguing to explore the effects of non-inert (reactive) ions such as, N2 + , C + , etc., on magnetic stacks. While reactive implantation effects have been studied previously [149], [427]- [431],…”

Section: Discussionmentioning

confidence: 99%

Defect Engineering Of Perpendicular Magnetic Anisotropy In Cobalt-Based Thin Films

Mahendra

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Magnetic sensors have widespread applications in industrial, security, space, and biomedical fields, offering precise measurement of magnetic fields using principles like the Hall effect and magnetoresistance. Magnetic tunnel junctions (MTJs) have played a pivotal role in advancing magnetic sensing through tunnelling magnetoresistance (TMR), contributing to spintronic devices, memory systems, and magnetic sensors. The magnetic anisotropy of the reference ferromagnetic layer in MTJ sensors is a critical factor, influencing sensitivity, accuracy, and sensing direction. Perpendicular magnetic anisotropy (PMA) is particularly advantageous for detecting magnetic fields perpendicular to the sensor plane, opening possibilities in non-destructive testing and magnetic read heads. However, conventional sensors are restricted to fixed axes, hindering their ability to measure fields in three dimensions. To address this limitation, this thesis proposes a magnetic sensor with a tuneable sensing axis, enabling comprehensive field detection in all axes. As part of this exploration, the thesis investigates ion irradiation as a post-processing technique to modify the PMA of ferromagnetic layers, offering versatility for various applications.Cobalt-based materials, especially CoFeB, are well-known for their suitability in MTJs due to high TMR with MgO and PMA at low thicknesses. Half-metallic Heusler alloys, like Co2MnGa, have gained attention for their theoretically infinite TMR, high spin polarization, and high PMA. This research assesses the effects of ion irradiation on ultra-thin Co2MnGa and CoFeB stacks with PMA.Ion irradiation is a versatile tool for precisely tailoring magnetic stack properties with uniformity and reproducibility. This thesis investigates the impact of 30 keV Ar and Ne ion irradiation on CoFeB and Co2MnGa thin film stacks at low fluences (1 × 1013 to 1 × 1015 ion·cm−2), introducing displacement per atom (DPA) as a predictive parameter for ion-induced magnetic property changes. Results show a consistent reduction in PMA for both materials in half-MTJ stacks after irradiation, which is linked to intermixing of the magnetic layer with its adjacent MgO and heavy metal layers. Ar irradiation has a more pronounced effect due to higher DPA, while Ne irradiation has a milder impact. Co2MnGa displays relatively more resilience to irradiation due to reduced intermixing with adjacent layers, compared to CoFeB. Furthermore, the thesis explores the dynamic tuning of magnetic properties through ionic liquid gating, allowing anisotropy and coercivity manipulation via voltage control. It also delves into ion irradiation's potential to enhance the magneto-ionic effect. Lastly, a novel magnetic sensor design is introduced featuring a tuneable sensing axis, enabling three-dimensional detection capabilities.

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Local Manipulation of Skyrmion Nucleation in Microscale Areas of a Thin Film with Nitrogen-Ion Implantation

Cited by 4 publications

References 58 publications

Regulation of interfacial Dzyaloshinskii−Moriya interaction in ferromagnetic multilayers

Regulation of interfacial Dzyaloshinskii−Moriya interaction in ferromagnetic multilayers

Exotic Topological Magnetic States in Thin Co/Pd Ferromagnetic Films

Defect Engineering Of Perpendicular Magnetic Anisotropy In Cobalt-Based Thin Films

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