Damping of CoxFe80−xB20 ultrathin films with perpendicular magnetic anisotropy

Devolder, T.; Ducrot, P.-H.; Adam, Jean-Paul; Barisic, I.; Vernier, N.; Kim, Joo-Von; Ockert, B.; Ravelosona, D.

doi:10.1063/1.4775684

Cited by 138 publications

(107 citation statements)

References 20 publications

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“…The solid lines correspond to the (thicker) films with hcp(0001)-dominated structure and the dashed lines are fits to the (thinner) fcc(111)-dominated phase for Cu and Ir overlayered films. The α 0 were extracted from the intercepts, and are shown in Table I; these agree well with literature values for bulk hcp Co [30], and a recent theoretical prediction for bulk fcc Co [29]. In principle, the slope of the fits shown in Fig.…”

Section: Fig 1 (Color Online)supporting

confidence: 64%

Interfacial Structure Dependent Spin Mixing Conductance in Cobalt Thin Films

et al. 2015

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Reprinted with permission from the American Physical Society: Physical Review Letters 115, 056601 c (2015) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Section: Fig 1 (Color Online)supporting

confidence: 64%

Interfacial Structure Dependent Spin Mixing Conductance in Cobalt Thin Films

et al. 2015

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“…The effective perpendicular anisotropy field (µ 0 H eff k ) and the Gilbert damping constant (α) in [Co/Ni] was measured via vector-network-analyzer ferromagnetic resonance (VNA-FMR) 39 and corresponding analysis 40 . The effective perpendicular anisotropy energy (K eff U ) is calculated by the equation…”

Section: Methodsmentioning

confidence: 99%

“…Earlier studies reported on dopants that increase the damping when incorporated into a ferromagnetic film 40,54 . In our case, it is natural to expect that an impact from the diffused seed layer element will be exerted on the dynamic magnetic properties of [Co/Ni].…”

Section: Impact Of Diffusion On the Dynamic Magnetic Propertiesmentioning

confidence: 99%

Seed layer impact on structural and magnetic properties of [Co/Ni] multilayers with perpendicular magnetic anisotropy

Liu

Swerts

Devolder

et al. 2017

Journal of Applied Physics

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[Co/Ni] multilayers with perpendicular magnetic anisotropy (PMA) have been researched and applied in various spintronic applications. Typically the seed layer material is studied to provide the desired facecentered cubic (fcc) texture to the [Co/Ni] to obtain PMA. The integration of [Co/Ni] in back-end-of-line (BEOL) processes also requires the PMA to survive post-annealing. In this paper, the impact of NiCr, Pt, Ru, and Ta seed layers on the structural and magnetic properties of [Co(0.3 nm)/Ni(0.6 nm)] multilayers is investigated before and after annealing. The multilayers were deposited in-situ on different seeds via physical vapor deposition at room temperature. The as-deposited [Co/Ni] films show the required fcc(111) texture on all seeds, but PMA is only observed on Pt and Ru. In-plane magnetic anisotropy (IMA) is obtained on NiCr and Ta seeds, which is attributed to strain-induced PMA loss. PMA is maintained on all seeds after post-annealing up to 400 • C. The largest effective perpendicular anisotropy energy (K eff U ≈ 2 × 10 5 J/m 3 ) after annealing is achieved on NiCr seed. The evolution of PMA upon annealing cannot be explained by further crystallization during annealing or strain-induced PMA, nor can the observed magnetization loss and the increased damping after annealing. Here we identify the diffusion of the non-magnetic materials from the seed into [Co/Ni] as the major driver of the changes in the magnetic properties. By selecting the seed and post-annealing temperature, the [Co/Ni] can be tuned in a broad range for both PMA and damping.

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“…Additionally, the amorphous CoFeB films would be expected to have a very low Gilbert damping coefficient down to 0.012 due to the homogeneity of the interfaces. 41 Low M s , high K u (very thin Bloch wall width) and low damping coefficient are desirable for creating spin-transfer torque devices working with low current density of spin-switching to compete with the other PMA thin films. 13,42 Regarding the magnetization reversal, the studied multilayer films would be very potential to apply to the domain-wall spin-torque devices, particularly, because the interfacial-supported domain nucleation and steady movement of the domain walls would be fruitful for simple control of domain walls motion.…”

Section: Conclusion and Outlooksmentioning

confidence: 99%