Proximity effects in superconductor/normal-metal/ferromagnet trilayers

Yamazaki, Hiroki; Shannon, Nic; Takagi, H.

doi:10.1016/j.jmmm.2006.10.800

Cited by 1 publication

(4 citation statements)

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“…7,8 The comparative study of Nb/Au/Co and Nb/Au/Fe trilayers presented here makes it possible to put this question on a firmer footing. Three key features emerge: ͑1͒ "longperiod" oscillations with a period of 2.1 nm ͑ϳ9 ML͒ are seen for t Au Ͼ 2 nm, while for t Au Ͻ 3 nm "short-period" oscillations with a period of 0.76 nm ͑ϳ3.2 ML͒ are seen in Nb/Au/Co trilayers but were not observed for Nb/Au/Fe trilayers.…”

Section: Discussionmentioning

confidence: 97%

“…The main challenge posed by current experiments on SC/NM/FM trilayers is to understand the mechanism(s) which determine the superconducting transition temperature T c , as a function of the thickness of the normal metal layer NM. 7,8 The comparative study of Nb/Au/Co and Nb/Au/Fe trilayers presented here makes it possible to put this question on a firmer footing. Three key features emerge: (1) "long-period" oscillations with a period of 2.1 nm (~9 ML) are seen for t Au >2 nm, while for t Au <3 nm "short-period" oscillations with a period of 0.76 nm (~3.2 ML) are seen in Nb/Au/Co trilayers but were not observed for Nb/Au/Fe trilayers.…”

Section: Discussionmentioning

confidence: 97%

“…In our previous papers, 7,8 we explored possible routes to a long-period oscillation in T c , namely (a) a periodic Friedel-type oscillation in the density of electrons in the NM layer, (b) FFLO oscillations in the superfluid density, and (c) an RKKY type of oscillation in the effective magnetic exchange field across the NM layer. None of these was found to offer a satisfactory explanation of our results for Nb/Au/Fe trilayers.…”

Section: Discussionmentioning

confidence: 99%

“…Predictions that this should lead to Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) oscillations in the superconducting order parameter, 1,2 were confirmed spectacularly by experiments on SC/FM/SC trilayers. 3 In recent years, a number of authors have also investigated the experimental [4][5][6][7][8][9] and theoretical 10,11 properties of SC/NM/FM trilayer systems, in which a layer of normal metal (NM) is introduced between a SC and a FM. The interaction between SC and FM is now mediated by the conduction electrons of the intermediate NM layer.…”

Section: Introductionmentioning

confidence: 99%

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Interplay between superconductivity and ferromagnetism in epitaxial Nb(110)/Au(111)/Co(0001) trilayers

2010

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Epitaxially grown multilayer systems offer the possibility to study the influence of ferromagnetism on superconductivity in a controlled way. In this paper, we explore how the superconducting properties of high quality epitaxially grown superconductor/normal-metal/ferromagnet trilayers evolve as a function of the exchange splitting in the ferromagnet and the thickness of the normal-metal layer. We report results for Nb͑110͒/ Au͑111͒/Co͑0001͒ and make a detailed comparison with earlier results for Nb͑110͒/Au͑111͒/Fe͑110͒. We use quantitative fast Fourier transform analysis to confirm the existence of a long-period ͑2.1 nm͒ oscillation in the superconducting transition temperature T c as a function of the Au-layer thickness t Au for t Au Ͼ 2 nm and highlight an additional short-period ͑0.76 nm͒ oscillation for t Au Ͻ 3 nm in Nb/Au/Co. This short-period oscillation can be explained in terms of a damped Ruderman-Kittel-Kasuya-Yoshida-like oscillation of the spin polarization in Au. The robustness of the long-period oscillation against the substitution of Co for Fe suggests that it is intrinsic to the Au͑111͒ layer on Nb and may represent a form of quantum interference in very clean trilayer systems.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%