Changes in magnetic scattering anisotropy at a ferromagnetic/superconducting interface

Eid, Khalid; Pratt, W. P.; Bass, J.

doi:10.1103/physrevb.70.100411

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…(11) Section 8.10.1 and Tables 1 and 11 show that values of β F from CPP-MR for F-alloys agree well in sign and reasonably well in size with ones from Deviations from Matthiessen's Rule (DMR) [36] for dilute F-alloys, provided that β F is determined concurrently with (Figs. 55,56,78,79). These agreements tend to support a claim of 'universality' for β F .…”

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confidence: 54%

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CPP magnetoresistance of magnetic multilayers: A critical review

Bass

2016

Journal of Magnetism and Magnetic Materials

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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...

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confidence: 54%

“…Until 2004, this assumption was based only upon the ability to fit the published data. In 2004, Eid et al [55] developed a way to look for spin-asymmetry, γ F/XS . They made a Co/X/S interface part of a complex Py & Co based SV that was constructed to give AΔR near zero when X is absent.…”

Section: Contact Specific Resistances Ar F/nb With Superconductingmentioning

confidence: 99%

CPP magnetoresistance of magnetic multilayers: A critical review

Bass

2016

Journal of Magnetism and Magnetic Materials

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“…Intriguingly, almost all of the values for S ¼ Nb determined in this way are very similar, ranging only from 4.8 to 7.5 fOm 2 with uncertainties that almost all overlap with 6 AE 1 fOm . These values are not sensitive to deposition of 5-10 nm of Ag or Cu between the Nb and the F-layer [16,102], but are slightly sensitive to deposition of Au or Ru [102]. Satisfactory quantitative explanations for these results do not yet exist.…”

Section: Ar S/fmentioning

confidence: 44%

CPP-GMR: Materials and Properties

Bass¹

2014

Handbook of Spintronics

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“…Intriguingly, all of the values for S = Nb determined in this way are very similar, ranging only from 4.8 to 7.5 fΩm 2 with uncertainties that almost all overlap with 6 ± 1 fΩm 2 . These values are not sensitive to deposition of 5-10 nm of Ag or Cu between the Nb and the F layer [17,105], but are slightly sensitive to deposition of Au or Ru [105]. Satisfactory quantitative explanations for these results do not yet exist.…”

Section: Interface Parametersmentioning

confidence: 91%