The role of the non-magnetic material in spin pumping and magnetization dynamics in NiFe and CoFeB multilayer systems

Ruiz-Calaforra, A.; Brächer, Thomas; Lauer, V.; Pirro, Philipp; Heinz, Björn; Geilen, Moritz; Chumak, A. V.; Conca, A.; Leven, B.; Hillebrands, B.

doi:10.1063/1.4918909

Cited by 75 publications

(71 citation statements)

References 50 publications

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“…However, the effect of spin pumping should be very limited over the studied thickness range of Pt, as it is comparable or below the spin-diffusion length, λ sd [12,[33][34][35][36]. Hence, d-d hybridization mainly contributes to the intrinsic enhancement of the damping.…”

Section: Discussionmentioning

confidence: 99%

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

et al. 2016

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Reprinted with permission from the American Physical Society: Azzawi, S. and Ganguly, A. and Toka c, M. and Rowan-Robinson, R.M. and Sinha, J. and Hindmarch, A.T. and Barman, A. and Atkinson, D. (2016) 'Evolution of damping in ferromagnetic/nonmagnetic thin lm bilayers as a function of nonmagnetic layer thickness.', Physical review B., 93 (5). 054402 c 2016 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, modied, 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-prot 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. The evolution of damping in Co/Pt, Co/Au, and Ni 81 Fe 19 /Pt bilayers was studied with increasing nonmagnetic (NM) heavy-metal layer thicknesses in the range 0.2 nm t NM 10 nm, where t NM is the NM layer thickness. Magnetization precession was measured in the time domain using time-resolved magneto-optical Kerr effect magnetometry. Fitting of the data with a damped sinusoidal function was undertaken in order to extract the phenomenological Gilbert damping coefficient α. For Pt-capped Co and Ni 81 Fe 19 layers a large and complex dependence of α on the Pt layer thickness was observed, while for Au capping no significant dependence was observed. It is suggested that this difference is related to the different localized spin-orbit interaction related to intermixing and to d-d hybridization of Pt and Au at the interface with Co or Ni 81 Fe 19 . Also it was shown that damping is affected by the crystal structure differences in FM thin films and at the interface, which can modify the spin-diffusion length and the effective spin-mixing conductance. In addition to the intrinsic damping an extrinsic contribution plays an important role in the enhancement of damping when the Pt capping layer is discontinuous. The dependence of damping on the nonmagnetic layer thickness is complex but shows qualitative agreement with recent theoretical predictions.

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Section: Discussionmentioning

confidence: 99%

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

et al. 2016

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“…For instance, recently, Ruiz-Calaforra et al [12] presented a meticulous research on FM/NM multilayers, where FM is a ferromagnetic material, as NiFe and CoFeB, alloys commonly used as free layer in Tunnel Magnetoresistance (TMR) and Giant Magnetostriction (GMS) stacks, while NM is a non-magnetic spacer material, as Pt, Al, Cr, Ru and MgO, materials frequently employed in spintronics studies, and explored the magnetization dynamics through the ferromagnetic resonance effect (FMR) and inverse spin Hall effect. From the experimental FMR results, an estimative of the effective damping parameter was obtained.…”

Section: Introductionmentioning

confidence: 98%

“…In particular, the magnetic damping plays an important role as a tuning parameter. While systems with low damping parameter are employed in ultrafast sensors [10,11], systems presenting high damping one are explored in spin pumping and inverse spin Hall effect applications [5,12].…”

Section: Introductionmentioning

confidence: 99%

Exploring the magnetization dynamics of NiFe/Pt multilayers in flexible substrates

Corrêa

Dutra

Marcondes

et al. 2016

Materials Science and Engineering: B

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a b s t r a c tWe investigate the structural and magnetic properties, and the magnetization dynamics in Ni 81 Fe 19 /Pt multilayer systems grown onto rigid and flexible substrates. The structural characterization shows evidence of a superlattice behavior, while the quasi-static magnetization characterization reveal a weak magnetic anisotropy induced in the multilayers. The magnetization dynamics is investigated through the magnetoimpedance effect. We employ a theoretical approach to describe the experimental magnetoimpedance effect and verify the influence of the effective damping parameter on the magnetization dynamics. Experimental data and theoretical results are in agreement and suggest that the multilayers present high effective damping parameter. Moreover, our experiments raise an interesting issue on the possibility of achieving considerable MI% values, even for systems with weak magnetic anisotropy and high damping parameter grown onto flexible substrates.

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“…13 To improve its flexibility for applications, it is also of interest to deposit Fe 4 N on the non-magnetic metal buffer layers rather than single crystal substrates, as the metal layers underneath Fe 4 N may facilitate a variety of spintronics devices. 3,4,14,15 In addition, the spin polarization of a material is closely related to its growth conditions and crystallinity. Therefore, studying the spin a Author to whom correspondence should be addressed: jpwang@umn.edu 2158-3226/2017/7(9)/095001/6 7, 095001-1 © Author(s) 2017 polarization of Fe 4 N grown on a practical metal buffer layer is also very helpful for its applications in spintronics.…”

Section: Introductionmentioning

confidence: 99%

“…The Ta/Ru buffer layer also potentially works as the bottom electrodes of the MTJ/GMR 3,4 and the nonmagnetic materials in the spin pumping devices. 14 The nitrogen compositions of the films and the deposition temperature were tuned to optimize the phase formation of Fe 4 N. Moreover, the spin polarization of the (111) oriented Fe 4 N was measured by the point contact Andreev reflection (PACR) method. 16 The thickness dependence of the spin polarization was also studied.…”

Section: Introductionmentioning

confidence: 99%

Deposition and spin polarization study of Fe4N thin films with (111) orientation

Osofsky

Jensen

et al. 2017

AIP Advances

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We have successfully deposited Fe4N thin films with (111) out-of-plane orientation on thermally oxidized Si substrates using a facing-target-sputtering system. A Ta/Ru composite buffer layer was adopted to improve the (111) orientation of the Fe4N thin films. The N2 partial pressure and substrate temperature during sputtering were optimized to promote the formation of the Fe4N phase. Furthermore, we measured the transport spin polarization of (111) oriented Fe4N by the point contact Andreev reflection (PCAR) technique. The spin polarization ratio was determined to be 0.50 using a modified BTK model. The film thickness dependence of the spin polarization was also investigated. The spin polarization of Fe4N measured by PCAR does not show degradation as the sample thickness was reduced to 10nm.

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The role of the non-magnetic material in spin pumping and magnetization dynamics in NiFe and CoFeB multilayer systems

Cited by 75 publications

References 50 publications

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

Exploring the magnetization dynamics of NiFe/Pt multilayers in flexible substrates

Deposition and spin polarization study of Fe4N thin films with (111) orientation

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