Realization of artificial skyrmion in CoCrPt/NiFe bilayers

Long, Yi; Luo, Yansheng; Qian, Zhenghong; Zhu, Jianguo

doi:10.1088/1674-1056/27/12/127503

Cited by 5 publications

(5 citation statements)

References 33 publications

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“…Considering the FM IEC, an skyrmion-like spin texture can be formed across both the top dot and bottom film as reported previously. [28,[34][35][36] Our SAF multilayer is non-compensated and the IEC is antiferromagnetic type.…”

Section: Resultsmentioning

confidence: 97%

An Artificial Skyrmion Platform with Robust Tunability in Synthetic Antiferromagnetic Multilayers

Feng

et al. 2019

Adv Funct Materials

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Magnetic skyrmions are topologically non-trivial spin structure, and their existence in ferromagnetically coupled multilayers has been reported with disordered arrangement. In these multilayers, the heavy metal spacing layers provide an interfacial Dzyaloshinskii-Moriya interaction (DMI) for stabilizing skyrmions at the expense of interlayer exchanging coupling (IEC). To meet the functional requirement of ordered/designable arrangement, in this work, we proposed and experimentally demonstrated a scenario of skyrmion nucleation using nanostructured synthetic antiferromagnetic (SAF) multilayers. Instead of relying on DMI, the antiferromagnetic IEC in the SAF multilayers fulfills the role of nucleation and stabilization of skyrmions. The IEC induced skyrmions were identified directly imaged with MFM and confirmed by magnetometry and magnetoresistance measurements as well as micromagnetic simulation. Furthermore, the robustness of the proposed skyrmion nucleation scenario was examined against temperature (from 4.5 to 300 K), device size (from 400 to 1200 nm), and different lattice designs. Hence, our results provide a synthetic skyrmion platform meeting the functional needs in magnonic and spintronic applications.

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Section: Resultsmentioning

confidence: 97%

An Artificial Skyrmion Platform with Robust Tunability in Synthetic Antiferromagnetic Multilayers

Feng

et al. 2019

Adv Funct Materials

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“…It can be seen that the infrared transmittance of the crystal decreases obviously with the increase of Al doping content. The infrared transmittance of crystals can be calculated by the following formula [41]:…”

Section: Effect Of Al On the Dislocation Of Ga 086 In 014 Sb Crystalmentioning

confidence: 99%

Improving the quality and properties of GaInSb crystal with Al doping

Wang,

Liu,

Liu

et al. 2024

Phys. Scr.

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GaInSb crystal is a promising substrate material that can be used to prepare various high-performance devices. Ga0.86In0.14Sb and Al-doped Ga0.86In0.14Sb (Ga0.86In0.14Sb:Al) crystals were grown with the vertical Bridgman method (VB). The doping concentration of aluminum (Al) is 0.005 - 0.015 molar ratio. The effect of Al doping on the structure and properties of Ga0.86In0.14Sb crystal was studied. The results indicated that Al doping significantly reduced the segregation of indium (In) component in the crystal, with the radial segregation reaching a minimum of 0.051 mol%/mm and the axial segregation reaching a minimum of 0.067 mol%/mm. The doping of Al also improved the crystal quality (lattice structure integrity) of Ga0.86In0.14Sb. The passivation and compensation of Al on the intrinsic defects of Ga0.86In0.14 Sb crystal significantly inhibited the generation of dislocation, of which density decreased to 2.461 × 103 cm-2. The doping of Al as the equivalent electron element of gallium (Ga) and In not only made the carrier concentration increase to 1.848 × 1018 cm-3 but also made the carrier mobility increase to 1.982 × 103 cm2/(V·s), resulting in the resistivity decreasing to 1.261 × 10−3 Ω·cm.

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“…Similar simulation results in Co/CoPt bilayers were reported by Si et al [ 28 ] Three different spin textures, the I‐type vortex, the Bloch‐type skyrmion, and the II‐type vortex, were found to depend on three different PMA constants of the CoPt layer. The material parameters chosen for this study are those of the CoCrPt/NiFe bilayers, [ 27 ] which are different from those of the Co/CoPt bilayer reported by Si et al [ 28 ]…”

Section: Stability Of the Artificial Skyrmionmentioning

confidence: 99%

“…In our previous work, it was found that the Bloch‐type skyrmion was stable in the CoCrPt/NiFe bilayer. [ 27 ] As shown in Figure 2 a–d, at the beginning, set the magnetic moments to a random distribution. Applying a 400 mT magnetic field, all the magnetic moments were reversed.…”

Section: Simulation Modelmentioning

confidence: 99%

Influence of Material Parameters on the Stability of Artificial Skyrmion in Hard/Soft Magnetic Bilayers

Liu

Qian

Zhu

2021

Physica Status Solidi (b)

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Herein, the influence of material parameters on the core diameter of the artificial skyrmions in hard magnetic/soft magnetic bilayer thin film is investigated. It is found that the perpendicular magnetic anisotropy (PMA) constant and the interlayer exchange constant play a key role in the realization of artificial skyrmions. Through simulation, the PMA constant of the hard magnetic materials should be between 1.0 × 105 and 4.5 × 105 J m−3. Therefore, some rare earth materials with high magnetic anisotropy or other materials with low magnetic anisotropy do not meet the requirement. The initial skyrmion spin texture is Bloch‐type artificial skyrmion in the hard/soft magnetic bilayer system. In the presence of 1.0–1.5 × 105 J m−3 PMA constant and 0 J m−1 interlayer exchange constant, the Néel‐type artificial skyrmions are formed in the hard/soft magnetic bilayer system. The size of the hard magnetic layer material has little effect on the stability of skyrmions, so the stability of skyrmions should mainly be adjusted with the PMA of the hard magnetic materials or by changing the material types.

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Realization of artificial skyrmion in CoCrPt/NiFe bilayers

Cited by 5 publications

References 33 publications

An Artificial Skyrmion Platform with Robust Tunability in Synthetic Antiferromagnetic Multilayers

An Artificial Skyrmion Platform with Robust Tunability in Synthetic Antiferromagnetic Multilayers

Improving the quality and properties of GaInSb crystal with Al doping

Influence of Material Parameters on the Stability of Artificial Skyrmion in Hard/Soft Magnetic Bilayers

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