Spin pumping in Co56Fe24B20multilayer systems

Lee, H; Wen, Lianggong; Pathak, M.; Janssen, Pieter; LeClair, P.; Alexander, Chester; Mewes, Cka; Mewes, Tim

doi:10.1088/0022-3727/41/21/215001

Cited by 49 publications

(29 citation statements)

References 30 publications

(34 reference statements)

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“…Here, we rule out such possibility as Ta thickness in the present case is 5 nm which is less than the expected spin diffusion length of $10 nm for Ta. 18 So effectively, the observed trends in DH 0 and a are primarily influenced by the quality of interfaces and the modification of CoFeB microstructure by MgO growth process.…”

mentioning

confidence: 97%

Magnetization dynamics and interface studies in ion-beam sputtered Si/CoFeB(8)/MgO(4)/CoFeB(8)/Ta(5) structures

Raju¹,

Behera²,

Pandya³

et al. 2014

Journal of Applied Physics

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The interface roughness, Boron distribution in bulk CoFeB and at interface, Gilbert damping constant (α), and inhomogeneous broadening in ion-beam sputtered Si/CoFeB(8)/MgO(4)/CoFeB(8)/Ta(5) structures are found to be sensitive to the MgO growth process. The ion-assist and reactive growth processes that result in sharper interfaces of width ∼0.5 nm lead to smaller α of 0.0050 ± 0.0003 and 0.0060 ± 0.0002 and inhomogeneous broadening ΔH0 of 3 ± 0.3 and 1 ± 0.3 Oe, respectively. On the other hand, the post-oxidation method results in rough interface and higher retention of Boron in CoFeB leading to higher values for α and ΔH0 as 0.0080 ± 0.0006 and 5 ± 0.3 Oe, respectively.

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mentioning

confidence: 97%

Magnetization dynamics and interface studies in ion-beam sputtered Si/CoFeB(8)/MgO(4)/CoFeB(8)/Ta(5) structures

Raju¹,

Behera²,

Pandya³

et al. 2014

Journal of Applied Physics

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“…As discussed in the Introduction, spin pumping is known to contribute to the magnetic relaxation of ferromagnetic films in proximity to normal metal films, or other ferromagnetic films 10,11,13 .…”

Section: Damping Parametermentioning

confidence: 99%

“…In magnetic multilayers and heterostructures, spin pumping is often found to be one of the dominant contributions to magnetic relaxation 13,14 . Because spin pumping enables the generation of pure spin currents in normal metals adjacent to ferromagnets 15,16 , which in turn can be detected using the inverse spin…”

Section: Introductionmentioning

confidence: 99%

Enhanced spin pumping near a magnetic ordering transition

et al. 2017

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We study the temperature-dependent static and dynamic magnetic properties of polycrystalline permalloy (Ni 80 Fe 20 , Py)/Gd bilayers using DC magnetometry and broadband ferromagnetic resonance. Magnetometry measurements reveal that the 3-nm-thick Gd layers undergo a magnetic ordering transition below 100 K, consistent with finite size suppression of their Curie temperature. Upon cooling below this Gd ordering temperature, ferromagnetic resonance spectroscopy reveals a sharp increase in both the gyromagnetic ratio (γ) and effective Gilbert damping parameter (α) of the neighboring Py layers. The increase of γ is attributed to the onset of strong antiferromagnetic coupling between the Gd and Py layers as the Gd orders magnetically. We argue that the increase of α, on the other hand, can be explained by spin pumping into the rare earth layer when taking into account the increase of γ, the decrease of the Gd spin diffusion length as it orders, and, most significantly, the corresponding increase of the Py/Gd interfacial spin mixing conductance in the vicinity of the magnetic ordering transition. We propose that these observations constitute a qualitative confirmation of a recent theoretical prediction of spin sinking enhancement in this situation.2

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“…The deviation from the expected values might be attributed to residual atomic disorder in the films or the presence of a perpendicular anisotropy caused by a small tetragonal distortion in the The frequency dependence of the linewidth of the ferromagnetic resonance absorption provides direct information about the magnetic relaxation. The frequency dependence of the linewidth [16,17] can under certain conditions be characterized by an inhomogeneous residual linewidth at zero field ∆H 0 and an intrinsic contribution [18]:…”

Section: Magnetization Dynamicsmentioning

confidence: 99%

Low Gilbert damping in Co2FeSi and Fe2CoSi films

Sterwerf

Paul

Khodadadi

et al. 2016

Journal of Applied Physics

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Thin highly textured Fe1+xCo2−xSi (0 ≤ x ≤ 1) films were prepared on MgO (001) substrates by magnetron co-sputtering. The magneto-optic Kerr effect (MOKE) and ferromagnetic resonance (FMR) measurements were used to investigate the composition dependence of the magnetization, the magnetic anisotropy, the gyromagnetic ratio and the relaxation of the films. The effective magnetization for the thin Fe1+xCo2−xSi films, determined by FMR measurements, are consistent with the Slater Pauling prediction. Both MOKE and FMR measurements reveal a pronounced fourfold anisotropy distribution for all films. In addition we found a strong influence of the stoichiometry on the anisotropy as the cubic anisotropy strongly increases with increasing Fe concentration. The gyromagnetic ratio is only weakly dependent on the composition. We find low Gilbert damping parameters for all films with values down to 0.0012 ± 0.00012 for Fe1.75Co1.25Si. The effective damping parameter for Co2FeSi is found to be 0.0018 ± 0.0004. We also find a pronounced anisotropic relaxation, which indicates significant contributions of two-magnon scattering processes that is strongest along the easy axes of the films. This makes thin Fe1+xCo2−xSi films ideal materials for the application in STT-MRAM devices.

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Spin pumping in Co₅₆Fe₂₄B₂₀multilayer systems

Cited by 49 publications

References 30 publications

Magnetization dynamics and interface studies in ion-beam sputtered Si/CoFeB(8)/MgO(4)/CoFeB(8)/Ta(5) structures

Magnetization dynamics and interface studies in ion-beam sputtered Si/CoFeB(8)/MgO(4)/CoFeB(8)/Ta(5) structures

Enhanced spin pumping near a magnetic ordering transition

Low Gilbert damping in Co2FeSi and Fe2CoSi films

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