Abstract

FZJ-2021-03008

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interplay of proximity effects in Superconductor/Ferromagnet heterostructures

Stellhorn, A.FZJ* ; Kentzinger, E.FZJ* ; Sarkar, A. ; Pipich, V.FZJ* ; Krycka, K. ; Schöffmann, P.FZJ* ; Bhatnagar, T.FZJ* ; Brückel, T.FZJ*

2021

Please use a persistent id in citations: http://hdl.handle.net/2128/28186

Abstract: Proximity effects in superconductor/ferromagnet thin film heterostructures are ahighly topical issue due to their potential application in superconducting spin valvesor fluxonic devices [1, 2]. Physical properties can be controlled by an appliedmagnetic field and emerge for example as stray-field generated domainsuperconductivityor spin-triplet correlations. Our goal is to investigate their interplayand tunability by an external magnetic field. We use a heterostructure system ofNb/FePd with varying strength of magnetocrystalline anisotropy and a lateral domainstructure, grown by molecular beam epitaxy.On the one hand, macroscopic magnetoelectric transport measurements reveal aconfined superconducting state due to the stray fields of L10-ordered FePd. On theother hand, direct proximity effects at the Nb/FePd interface with a non-collinearmagnetization presumably lead to the generation of spin-triplet Cooper paircomponents with long penetration depth within the ferromagnetic layer [3]. PolarizedGrazing-Incidence Small-Angle Neutron Scattering (GISANS) probe exchangemechanisms on the microscopic scale and reveal a change in the ferromagneticdomain pattern by an onset of domain-wall-superconductivity. This mechanismcannot be revealed by macroscopic magnetization measurements, which makesGISANS the method of choice for detecting inverse superconducting proximityeffects.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. JCNS-FRM-II (JCNS-FRM-II)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Appears in the scientific report 2021

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Database coverage:

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