Spin-memory loss at Co/Ru interfaces

Khasawneh, Mazin A.; Klose, Carolin; Pratt, W. P.; Birge, Norman O.

doi:10.1103/physrevb.84.014425

Cited by 19 publications

(13 citation statements)

References 48 publications

(95 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The transverse (field-like, HT) field turned out to be larger than the longitudinal (antidamping-like, HL), whereas in our work it was not detected at all, while the value of the longitudinal field in the Ru/Co/Ru structure is almost an order of magnitude larger. [35,36], so the value of is slightly less than the previously defined data for the mixed α + β crystalline phase of W:…”

Section: Table IImentioning

confidence: 66%

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

et al. 2019

View full text Add to dashboard Cite

An experimental study of current-induced magnetization reversal of the Ru/Co/Ru and Ru/Co/Ru/W structures was carried out. In the considered structures, due to the small value of the coercive force comparable in magnitude to the Oersted field and the SOT effect field, magnetization reversal is carried out by moving a domain wall parallel to the direction of current injection. For such a case, a new method for estimating the effective field of SOT based on the analysis of the domain wall position taking into account the distribution of the Oersted field was proposed. This method allowed determining the effective longitudinal field / = 1.6 • 10 −11 / −2 and the efficiency of SOT = 0.03 in the quasi-symmetric Ru/Co/Ru structure. It was found that adding the W capping layer enhances the SOT effect by 5 times. I.

show abstract

Section: Table IImentioning

confidence: 66%

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Measurements on Co/Ni [91], (Co 91 Fe 9 )/Cu [213], and Co/Ag [212] all gave moderate values of δ in the range 0.19 to 0.35, as listed in Table 16. Co/Ru, measured two different ways, gave δ Co/Ru = 0.33 −0.02 +0.04 and 0.35±0.08 [214].…”

Section: δ F/n or δ F1/f2 : Spin-flipping At F/n And F1/f2 Interfacesmentioning

confidence: 99%

CPP magnetoresistance of magnetic multilayers: A critical review

Bass

2016

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

We present a comprehensive, critical review of data and analysis of Giant (G) Magnetoresistance (MR) with Current-flow Perpendicular-to-the-layer-Planes (CPP-MR) of magnetic multilayers [F/N] n (n = number of repeats) composed of alternating nanoscale layers of ferromagnetic (F) and non-magnetic (N) metal, or of spin-valves that allow control of anti-parallel (AP) and parallel (P) orientations of the magnetic moments of adjacent F-layers. GMR, a large change in resistance when an applied magnetic field changes the moment ordering of adjacent F-layers from AP to P, was discovered in 1988 in the geometry with Current flow in the layer-Planes (CIP). The CPP-MR has two advantages over the CIP-MR: (1) relatively simple two-current series-resistor (2CSR) and more general Valet-Fert (VF) models allow more direct access to the underlying physics; and (2) it is usually larger, which should be advantageous for devices. When the first CPP-MR data were published in 1991, it was not clear whether electronic transport in GMR multilayers is completely diffusive or at least partly ballistic. It was not known whether the properties of layers and interfaces would vary with layer thickness or number. It was not known whether the CPP-MR would be dominated by scattering within the F-metals or at the F/N interfaces. Nothing was known about: (1) spin-flipping within F-metals, characterized by a spin-diffusion length, ; (2) interface specific resistances (AR = area A times resistance R) for N1/N2 interfaces; (3) interface specific resistances and interface spin-dependent scattering asymmetry at F/N and F1/F2 interfaces; and (4) spin-flipping at F/N, F1/F2 and N1/N2 interfaces. Knowledge of spin-dependent scattering asymmetries in F-metals and F-alloys, and of spin-flipping in N-metals and N-alloys, was limited. Since 1991, CPP-MR measurements have quantified the scattering and spin-flipping parameters that determine GMR for a wide range of F-and N-metals and alloys and of F/N pairs. This review is designed to provide a history of how knowledge of CPP-MR parameters grew, to give credit for discoveries, to explain how combining theory and experiment has enabled extraction of quantitative information about these parameters, but also to make clear that progress was not always direct and to point out where disageements still exist. To limit its length, the review considers only collinear orientations of the moments of adjacent F-layers. To aid readers looking for specific information, we have provided an extensive table of contents and a detailed summary. Together, these should help locate over 100 figures plus 17 tables that collect values of individual parameters. In 1997, CIP-MR replaced anisotropic MR (AMR) as the sensor in read heads of computer hard drives. In principle, the usually larger CPP-MR was a contender for the next generation read head sensor. But in 2003, CIP-MR was replaced by the even larger Tunneling MR (TMR), which has remained the read-head sensor ever since. However, as memory bits shrink to where the relative...

show abstract

“…Aside from the complication of the current density distribution, other effects enter. In the SP, the interface leads to the spin memory loss [44][45][46]; in the meanwhile, it creates an interface inverse Edelstein effect [47]. For the STT, there are complications on the relative contributions of the spin torque from the interface and bulk.…”

Section: Resultsmentioning

confidence: 99%

Roles of nonlocal conductivity on spin Hall angle measurement

Chen

Zhang

2017

Phys. Rev. B

View full text Add to dashboard Cite

Spin Hall angle characterizes the rate of spin-charge current conversion and it has become one of the most important material parameters for spintronics physics and device application. A long-standing controversy is that the spin Hall angles for a given material measured by spin pumping and by spin Hall torque experiments are inconsistent and they could differ by as much as an order of magnitude. By using the linear response spin transport theory, we explicitly formulate the relation between the spin Hall angle and measured variables in different experiments. We find that the nonlocal conductivity inherited in the layered structure plays a key role to resolve conflicting values of the spin Hall angle. We provide a generalized scheme for extracting spin transport coefficients from experimental data.

show abstract

Spin-memory loss at Co/Ru interfaces

Cited by 19 publications

References 48 publications

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

Advanced Method for the Reliable Estimation of Spin-Orbit-Torque Efficiency in Low-Coercivity Ferromagnetic Multilayers

CPP magnetoresistance of magnetic multilayers: A critical review

Roles of nonlocal conductivity on spin Hall angle measurement

Contact Info

Product

Resources

About