Proximity effect in superconductor/ferromagnet layered system: Influence of superconductivity on magnetic properties of Nb/Fe epitaxial bilayers

Mühge, Th.; Goryunov, Yu. V.; Theis‐Bröhl, Katharina; Westerholt, K.; Zabel, H.; Гарифуллин, И. А.

doi:10.1007/bf03161863

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…The anomalous IPE presented in this paper can be observed by ferromagnetic resonance (FMR) measurements 72,73 , by nuclear magnetic resonance (NMR) measurements 68 , and by polar Kerr effect measurements 69 . In these experiments the conventional IPE has been observed.…”

Section: Discussionmentioning

confidence: 63%

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Anomalous inverse proximity effect in unconventional-superconductor junctions

Suzuki

Hirai

Eschrig

et al. 2020

Preprint

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We investigate the effects of Andreev bound states due to the unconventional pairing on the inverse proximity effect of ferromagnet/superconductor junctions. Utilizing quasiclassical Eilenberger theory, we obtain the magnetization penetrating into the superconductor. We show that in a wide parameter range the direction of the induced magnetization is determined by two factors: whether Andreev bound states are present at the junction interface and the sign of the spin-mixing angle. In particular, when Andreev bound states appear at the interface, the direction of the induced magnetization is opposite to that without Andreev bound states. We also clarify the conditions under which the inverted induced magnetization appears. Applying this novel effect helps distinguishing the pairing symmetry of a superconductor.

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Section: Discussionmentioning

confidence: 63%

“…The IPE in conventional SC structures has been observed by several experimental techniques, e.g. ferromagnetic resonance 72,73 , nuclear magnetic resonance 68 , and polar Kerr effect 69 . How anisotropic pairing in USCs affects the IPE, in contrast, has not been discussed so far.…”

Section: Introductionmentioning

confidence: 99%

Anomalous inverse proximity effect in unconventional-superconductor junctions

Suzuki

Hirai

Eschrig

et al. 2020

Preprint

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“…25 Yet, studies of transition metal layers in direct contact to elementary superconductors did not show indications for topological superconductivity and dispersing Majorana edge modes. 15 For such lattices in direct contact to the superconductor, the realization of a SC state in the ferromagnet by the proximity effect [26][27][28] can be hampered by a strong inverse proximity effect, which may reduce the magnetism 29,30 and might also quench the superconductivity in the vicinity of the Shiba-lattice (see citations in 28 ). Another important issue for the development of 2D topological superconductivity is disorder.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)

Goedecke¹,

Schneider²,

Ma³

et al. 2022

Preprint

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Two-dimensional (2D) magnet-superconductor hybrid systems are intensively studied due to their potential for the realization of 2D topological superconductors with Majorana edge modes. It is theoretically predicted that this quantum state is ubiquitous in spin-orbit coupled ferromagnetic or skyrmionic 2D spin-lattices in proximity to an s-wave superconductor. However, recent examples suggest that the requirements for topological superconductivity are complicated by the multi-orbital nature of the magnetic components and disorder effects. Here, we investigate Fe monolayer islands grown on a surface of the s-wave superconductor with the largest gap of all elemental superconductors, Nb, with respect to magnetism and superconductivity using spin-resolved

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“…Yet, studies of transition metal layers in direct contact with elementary superconductors did not show indications for topological superconductivity and dispersing MMs . For such lattices in direct contact with the superconductor, the realization of a superconducting state in the ferromagnet by the proximity effect − can be hampered by a strong inverse proximity effect, which may reduce the magnetism , and might also quench the superconductivity in the vicinity of the Shiba lattice (see citations in ref ). Another important issue for the development of 2D topological superconductivity is disorder.…”

mentioning

confidence: 99%

Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)

Goedecke

Schneider

et al. 2022

ACS Nano

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Two-dimensional (2D) magnet–superconductor hybrid systems are intensively studied due to their potential for the realization of 2D topological superconductors with Majorana edge modes. It is theoretically predicted that this quantum state is ubiquitous in spin–orbit-coupled ferromagnetic or skyrmionic 2D spin–lattices in proximity to an s -wave superconductor. However, recent examples suggest that the requirements for topological superconductivity are complicated by the multiorbital nature of the magnetic components and disorder effects. Here, we investigate Fe monolayer islands grown on a surface of the s -wave superconductor with the largest gap of all elemental superconductors, Nb, with respect to magnetism and superconductivity using spin-resolved scanning tunneling spectroscopy. We find three types of islands which differ by their reconstruction inducing disorder, the magnetism and the subgap electronic states. All three types are ferromagnetic with different coercive fields, indicating diverse exchange and anisotropy energies. On all three islands, there is finite spectral weight throughout the substrate’s energy gap at the expense of the coherence peak intensity, indicating the formation of Shiba bands overlapping with the Fermi energy. A strong lateral variation of the spectral weight of the Shiba bands signifies substantial disorder on the order of the substrate’s pairing energy with a length scale of the period of the three different reconstructions. There are neither signs of topological gaps within these bands nor of any kind of edge modes. Our work illustrates that a reconstructed growth mode of magnetic layers on superconducting surfaces is detrimental for the formation of 2D topological superconductivity.

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Proximity effect in superconductor/ferromagnet layered system: Influence of superconductivity on magnetic properties of Nb/Fe epitaxial bilayers

Cited by 5 publications

References 15 publications

Anomalous inverse proximity effect in unconventional-superconductor junctions

Anomalous inverse proximity effect in unconventional-superconductor junctions

Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)

Correlation of Magnetism and Disordered Shiba Bands in Fe Monolayer Islands on Nb(110)

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