Effect of demagnetization factors on spin current transport

Wu, Pengguang; Chan, Ying-Ting; Hung, Tzu-Chao; Zhang, Yi-Hui; Qu, Danru; Chuang, Tien-Ming; Chien, C. L.; Huang, Sheng‐Yi

doi:10.1103/physrevb.102.174426

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…The magnetic vacuum permeability is given by

, saturation magnetization by

, effective uniaxial magnetocrystalline anisotropy by

, the shape anisotropy energy density by

, the elastic anisotropy

, and the applied external magnetic field

. The demagnetization field is given by

, where

is the demagnetization matrix whose effective factors can be estimated by certain geometrical shapes when the internal magnetic field is uniform [ 43 , 44 ]. The total effective anisotropy energy

of the magnetostrictive film is expressed by the sum of the three energy density parts in Equation (1), namely

.…”

Section: Principles and Methods For Modelingmentioning

confidence: 99%

Modeling and Parameter Sensitivity Improvement in ΔE-Effect Magnetic Sensor Based on Mode Localization Effect

Lyu

Wang

et al. 2022

Micromachines

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A mode-localized ΔE-effect magnetic sensor model is established theoretically and numerically. Based on the designed weakly coupled resonators with multi-layer film structure, it is investigated how the ΔE-effect of the magnetostrictive film under the external magnetic field causes the stiffness perturbation of the coupled resonators to induce the mode localization effect. Using the amplitude ratio (AR) as the output in the mode-localized ΔE-effect magnetic sensor can improve the relative sensitivity by three orders of magnitude compared with the traditional frequency output, which has been verified by simulations based on the finite element method (FEM). In addition, the effects of material properties and geometric dimensions on sensor performance parameters, such as sensitivity, linear range, and static operating point are also analyzed and studied in detail, providing the theoretical basis for the design and optimization of the mode-localized ΔE-effect magnetic sensor in different application scenarios. By reasonably optimizing the key parameters of the weekly coupled resonators, a mode-localized ΔE-effect magnetic sensor with the sensitivity of 18 AR/mT and a linear range of 0.8 mT can be achieved.

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“…The magnetic vacuum permeability is given by

, saturation magnetization by

, effective uniaxial magnetocrystalline anisotropy by

, the shape anisotropy energy density by

, the elastic anisotropy

, and the applied external magnetic field

. The demagnetization field is given by

, where

is the demagnetization matrix whose effective factors can be estimated by certain geometrical shapes when the internal magnetic field is uniform [ 43 , 44 ]. The total effective anisotropy energy

of the magnetostrictive film is expressed by the sum of the three energy density parts in Equation (1), namely

.…”

Section: Principles and Methods For Modelingmentioning

confidence: 99%

Modeling and Parameter Sensitivity Improvement in ΔE-Effect Magnetic Sensor Based on Mode Localization Effect

Lyu

Wang

et al. 2022

Micromachines

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“…The T c of monolayer TaS 2 [11,12] and few-layer MoTe 2 [13] have been experimentally confirmed to be about 2.2 K and 4 K, respectively. Monolayer h-MnB 3 with Boron in kagome lattice was also predicted to be a superconductor with T c of 24.9 K [14]. Recently, 2D W 2 N 3 has been synthesized experimentally [15].…”

mentioning

confidence: 99%

Hydrogenation-induced high-temperature superconductivity in two-dimensional molybdenum carbide Mo₂C₃

Jiao¹,

Liu²,

Liu³

et al. 2022

EPL

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Two-dimensional (2D) superconductors have important potential applications in constructing nano superconducting devices, thus, 2D superconductors with high critical temperature (Tc) are highly desired. Till now, the Tc of 2D superconductors are still relatively low. Based on density functional firstprinciples calculations, we predicted a new stable 2D transition metal molybdenum carbide 2H-Mo2C3. Based on the Eliashberg theory, we predict that it is not a superconductor. However, after hydrogenation, the hydrogen atoms increase the electronic density of states at the Fermi level, and strengthen the electron-phonon coupling. Accordingly, the hydrogenated 2H-Mo2C3, i.e., 2H-Mo2C3H2, is a 2D superconductor with Tc of 53 K, exceeding the McMillan limit. Thus, hydrogenation is an important strategy for obtaining 2D high-temperature superconductors at atmosphere pressure. In view of the high superconducting Tc of 2H-Mo2C3H2, it is highly expected to be synthesized in future experiments.

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Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers

2021

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Spin pumping experiments using ferromagnetic metals have reported highly efficient spin–charge conversion in Bi and at the Bi/Ag interface, possibly due to the inverse Rashba–Edelstein effect. However, longitudinal spin Seebeck effect experiments using the yttrium iron garnet ferrimagnetic insulator in Bi films and Bi/Ag bilayers do not show evidence of appreciable spin-to-charge conversion except the large Nernst signal inherent to Bi. These contrasting conclusions highlight the differences between magnetic metals and magnetic insulators as spin current injectors. Only the detected voltages that adhere to the inverse spin Hall effect of jC = (2e/ℏ)θSH jS × σ are due to spin currents.

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Effect of demagnetization factors on spin current transport

Cited by 5 publications

References 29 publications

Modeling and Parameter Sensitivity Improvement in ΔE-Effect Magnetic Sensor Based on Mode Localization Effect

Modeling and Parameter Sensitivity Improvement in ΔE-Effect Magnetic Sensor Based on Mode Localization Effect

Hydrogenation-induced high-temperature superconductivity in two-dimensional molybdenum carbide Mo₂C₃

Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers

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Effect of demagnetization factors on spin current transport

Cited by 5 publications

References 29 publications

Modeling and Parameter Sensitivity Improvement in ΔE-Effect Magnetic Sensor Based on Mode Localization Effect

Modeling and Parameter Sensitivity Improvement in ΔE-Effect Magnetic Sensor Based on Mode Localization Effect

Hydrogenation-induced high-temperature superconductivity in two-dimensional molybdenum carbide Mo2C3

Negligible spin–charge conversion in Bi films and Bi/Ag(Cu) bilayers

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Product

Resources

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Hydrogenation-induced high-temperature superconductivity in two-dimensional molybdenum carbide Mo₂C₃