Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni<sub>0.81</sub>Fe<sub>0.19</sub> Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer

Li, Yaojin; Li, Chunlei; Lu, Qi; Du, Qin; Shi, Ke‐Qing; Hu, Zhongqiang; Zhou, Ziyao; Liu, Ming; Pan, Jingye

doi:10.1021/acs.jpcc.1c05267

Cited by 5 publications

(4 citation statements)

References 40 publications

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“…Compared to bare Py, the enhanced Δ H for bilayer manifests the evidence of spin current transport across the Py/(α + β)-W interface. Recent studies , suggest that suppressing TMS and surface magnetic anisotropy as a function of D r via interfacial engineering reduces the extrinsic contributions to the Δ H . In this study, we have obtained negligible extrinsic contributions without any interfacial layer as a function of D r .…”

Section: Resultsmentioning

confidence: 99%

Structural Phase Engineering of (α + β)-W for a Large Spin Hall Angle and Spin Diffusion Length

Sriram,

Mondal,

Pradhan

et al. 2023

J. Phys. Chem. C

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Spin−orbit coupling (SOC) plays a crucial role in spin-to-charge interconversion in ferromagnet (FM)−heavy metal (HM) heterostructures. The SOC of a heavy metal strongly depends on its crystalline phase. Here, we report a systematic study of the effect of growth rate (D r ) on SOC-related parameters such as the spin-mixing conductance (g ↓↑ ), spin diffusion length (λ sd ), spin transparency, and spin Hall angle (θ SH ) in (α + β)-W. X-ray diffraction (XRD) results for W sputtered at different D r values show that the adatom energy is critical in determining the structural phase. The thickness dependence of the XRD results shows that all films sputtered at 0.06 nm/s nucleate as (α + β)-W on the Si substrate. Four-probe resistivity measurements for (α + β)-W (10) show that the resistivity is linearly proportional to D r with a negative slope. A ferromagnetic resonance (FMR)-based spin pumping study shows that the line width (ΔH) is enhanced due to spin current transport across the Py/(α + β)-W interface. The g ↓↑ shows a maximum of 10.1 × 10 18 m −2 and a minimum of 4.2 × 10 18 m −2 at D r of 0.08 and 0.06 nm/s, respectively. The extracted spin diffusion length for (α + β)-W is 0.98 ± 0.01 nm. The calculated spin transparency for (α + β)-W is 0.74. The inverse spin Hall effect (ISHE) is demonstrated for Py(20)/(α + β)-W(10) bilayer heterostructures. From ISHE measurements, the calculated spin Hall angle for (α + β)-W is found to be θ SH = −0.24 ± 0.08. It is observed that D r strongly influences the spin diffusion length, spin transparency, and spin Hall angle. Our systematic study may open new possibilities for tuning spin transparency and spin Hall angle for developing low-power memory and logic devices.

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Section: Resultsmentioning

confidence: 99%

Structural Phase Engineering of (α + β)-W for a Large Spin Hall Angle and Spin Diffusion Length

Sriram,

Mondal,

Pradhan

et al. 2023

J. Phys. Chem. C

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“…The diffusion bonding improved the dispersion of brittle materials and could improve the bonding strength of materials. Li et al [45] indicated that the interfacial diffusion between nanoscale films of Cu and Ni 81 Fe 19 was the main reason for the interfacial inhomogeneity. The intermixing of Cu with adjacent materials has been recognised as the main physical factor of deterioration of magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

Li,

Dou,

Yang

et al. 2024

Friction

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Copper, permalloy, cobalt, and silicon are the materials that have been widely utilised in magnetic devices. When the size of interest is down to the nanoscale, the inter-diffusion between certain materials becomes influential. This paper studies the nanoscale friction characteristics between frictional pairs with and without inter-diffusion properties through the atomic force microscope. The distinct evolution features of nanoscale friction force when inter-diffusion is involved are discovered experimentally, which is also confirmed through theoretical analysis. Firstly, through the thin film deposition method, four pairs of contact materials (Cu–Ni81Fe19, Si–Ni81Fe19, Cu–Co, Cu–Si) are designed for friction tests, in which diffusion occurs at the interface of Cu–Ni81Fe19 pair. Then, the effects of sliding velocity and loading force on the nano friction of each pair are measured. It is found that regardless of the diffusion phenomenon: (1) the adhesion force values exhibit a notable correlation to the values of the friction force; (2) the friction force in all four material pairs consistently increases with the growth of the normal loading force, although the growth rate may differ. In terms of the sliding velocity effect, the friction forces of immiscible materials (Si–Ni81Fe19, Cu–Co, and Cu–Si) are found to increase with the increasing sliding velocity. However, the friction force of Cu–Ni81Fe19, decreases with the increasing sliding velocity. Furthermore, a compositive friction model considering both the velocity and the normal force effect was proposed, which shows good agreement with the experimental results and explains the nano friction behaviour of both miscible and immiscible metals.

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“…Permalloy is an extremely important spintronic material [24,25] having useful properties like high spin density, high magnetic permeability and low magnetic damping [26,27]. On the other hand Ta is being widely explored in FM/HM bilayers due to its high spin-orbit coupling that allows efficient charge current to spin current conversion and vice-versa [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…where γ is the gyromagnetic ratio and α is the dimensionless Gilbert magnetic damping parameter. α can be determined from the FMR linewidth [16][17][18]26]. In case of FM/NM heterostructures α can have additional contributions from spin pumping and spin back flow.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers

Priyanka¹,

Makani²,

Banerjee³

et al. 2022

Nanotechnology

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Spin pumping is a key property for spintronic application that can be realized in ferromagnet/Heavy metal bilayers. Here we demonstrate the possibility of improving spin pumping in Permalloy (Py)/Tantalum (Ta) bilayers through control of Ta heavy metal deposition temperature. Through a combination of structural and ferromagnetic resonance based magnetization dynamics study we reveal the role of Ta deposition temperature in improving spin mixing conductance which is a key parameter for spin pumping across the Py/Ta interface. The results show that by depositing Ta above room temperature a high spin mixing conductance of 7.7 ×1018 m−2 is obtained with α-Ta layer. The results present an understanding of the correlation between heavy metal deposition temperature and interface structure improvement and consequent control of spin pumping in Py/Ta bilayers.

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Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni_0.81Fe_0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer

Cited by 5 publications

References 40 publications

Structural Phase Engineering of (α + β)-W for a Large Spin Hall Angle and Spin Diffusion Length

Structural Phase Engineering of (α + β)-W for a Large Spin Hall Angle and Spin Diffusion Length

Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers

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Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni0.81Fe0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer

Cited by 5 publications

References 40 publications

Structural Phase Engineering of (α + β)-W for a Large Spin Hall Angle and Spin Diffusion Length

Structural Phase Engineering of (α + β)-W for a Large Spin Hall Angle and Spin Diffusion Length

Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers

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Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni_0.81Fe_0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer