Observation of a Transition From Inverse-Spin-Switch to Spin-Switch Behavior in Domain State of a Py/Nb/Py Trilayer

Hwang, Tae-Jong; Kim, Dong Ho; Oh, Sangjun

doi:10.1109/tmag.2009.2032144

Cited by 13 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies showing both positive and negative values of ∆R are explained on the basis of stray magnetic fields or vortex flow from a multi-domain state of one or both coupled F layers [14,29]. In our spin-valves positive ∆R is expected due to QP GMR, and a multidomain state with out-of-plane stray magnetic fields is unlikely since the antiferromagnetic FeMn ensures clear stable Pand AP-states above and below T c (Fig.…”

supporting

confidence: 49%

“…We note that ∆T c values of several hundred mK have been reported with rare-earth ferromagnetic metals and insulators [19][20][21]. Negative ∆T c values have also been reported [14,[22][23][24][25][26][27][28][29][30] due to quasiparticle (QP) spin-accumulation [23,26,28] suppressing T c in the AP-state [31,32], or flux penetration in S from out-of-plane domain walls in the F layers [14,24,27,30].…”

mentioning

confidence: 68%

“…The inset shows the equivalent trend of ∆T c versus d Nb [33]. For d Nb = 21 nm, the superconductor proximity effect reaches a positive ∆T c up to 314 mK (∆T c /T device = 0.26), which is unprecedented in transition metal F/S/F spin-valves where values are usually of the order tens of mK [9][10][11][12][13][14][15][16][17][18][22][23][24][25][26][27][28][29][30]. However, we note that these large values of ∆T c are linked to inflations in A∆R.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Evidence for competition between the superconductor proximity effect and quasiparticle spin-decay in superconducting spin-valves

Stoddart-Stones¹,

Montiel²,

Blamire³

et al. 2021

Preprint

View full text Add to dashboard Cite

The difference in the density of states for up-and down-spin electrons in a ferromagnet (F) results in spin-dependent scattering of electrons at a ferromagnet / nonmagnetic (F/N) interface. In a F/N/F spin-valve, this causes a current-independent difference in resistance (∆R) between antiparallel (AP) and parallel (P) magnetization states. Giant magnetoresistance (GMR), ∆R = R(AP ) − R(P ), is positive due to increased scattering of majority and minority spin-electrons in the AP-state. If N is substituted for a superconductor (S), there exists a competition between GMR and the superconductor proximity effect: in the AP-state the net magnetic exchange field acting on S is lowered and the superconductivity is reinforced meaning R(AP ) decreases. For currentperpendicular-to-plane (CPP) spin-valves, existing experimental studies show that GMR dominates (∆R > 0) over the superconductor proximity effect (∆R < 0) [J. Y. Gu et al., Phys. Rev. B 66, 140507 (2002)]. Here, however, we report a crossover from GMR (∆R > 0) to the superconductor proximity effect (∆R < 0) in CPP F/S/F spin-valves as the superconductor thickness decreases below a critical value. The results are key to the development of quasiparticle spintronics.

show abstract

supporting

confidence: 49%

mentioning

confidence: 68%

mentioning

confidence: 99%

See 1 more Smart Citation

Evidence for competition between the superconductor proximity effect and quasiparticle spin-decay in superconducting spin-valves

Stoddart-Stones¹,

Montiel²,

Blamire³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…[49][50][51][52][53][54] In some cases tuning the systems parameters leads to switching from standard to inverse spin-valve effect in resistance measurements. 55,56 All suggested explanations of the inverse spin-valve effect in F 1 /S/F 2 trilayers lay beyond the described proximity effect theory. The authors of Ref.…”

Section: Introductionmentioning

confidence: 96%

Standard, inverse, and triplet spin-valve effects inF1/S/F2systems

Миронов

Buzdin

2014

Phys. Rev. B

View full text Add to dashboard Cite

We demonstrate that contrary to the common belief the critical temperature Tc of clean F1/S/F2 spin valves can depend non-monotonically on the angle between the magnetic moments of the ferromagnetic F1 and F2 layers. Depending on the system parameters the minimum of Tc may correspond to parallel, antiparallel or non-collinear mutual orientation of magnetic moments. Such anomalous behavior can reveal itself only provided the ferromagnetic layers differ from each other and it completely disappears in the dirty limit.

show abstract

“…In particular while in systems including relatively weak ferromagnets such as CuNi alloy, the standard switching effect predicted by the theory 18 was observed, 15,16,19 some experiments with strong ferromagnetic materials have shown either the standard switching effect, 6,20 the inverse one, 7 or both. 5,21 As pointed out in Ref. 22, the spin-valve effect is measured at temperatures close to the critical temperature where superconducting properties are still weak, and the influence of magnetic inhomogeneity, in particular from domains and DWs, should be taken into account for a quantitative description of the effect.…”

Section: Introductionmentioning

confidence: 96%

Domain-wall-induced magnetoresistance in pseudo-spin-valve/superconductor hybrid structures

2012

View full text Add to dashboard Cite

We have studied the interaction between magnetism and superconductivity in a pseudo-spin-valve structure consisting of a Co/Cu/Py/Nb-layer sequence. We are able to control the magnetization reversal process and monitor it by means of the giant magnetoresistance effect during transport measurements. By placing the superconducting Nb-film on the top of the permalloy (Py) electrode instead of putting it in between the two ferromagnets, we minimize the influence of spin scattering or spin accumulation onto the transport properties of Nb. Magnetotransport data reveal clear evidence that the stray fields of domain walls (DWs) in the pseudospin valve influence the emerging superconductivity close to the transition temperature by the occurrence of peaklike features in the magneto-resistance characteristic. Direct comparison with magnetometry data shows that the resistance peaks occur exactly at the magnetization reversal fields of the Co and Py layers where DWs are generated. For temperatures near the superconducting transition the amplitude of the DW-induced magnetoresistance increases with decreasing temperature, reaching values far beyond the size of the giant magnetoresistive response of our structure in the normal state.

show abstract

Observation of a Transition From Inverse-Spin-Switch to Spin-Switch Behavior in Domain State of a Py/Nb/Py Trilayer

Cited by 13 publications

References 14 publications

Evidence for competition between the superconductor proximity effect and quasiparticle spin-decay in superconducting spin-valves

Evidence for competition between the superconductor proximity effect and quasiparticle spin-decay in superconducting spin-valves

Standard, inverse, and triplet spin-valve effects inF1/S/F2systems

Domain-wall-induced magnetoresistance in pseudo-spin-valve/superconductor hybrid structures

Contact Info

Product

Resources

About