The study of superconductor/ferromagnet interfaces has generated a great interest in the last decades, leading to the observation of equal spin spin triplet supercurrent and 0 − π transitions in Josephson junctions where two superconductors are separated by an itinerant ferromagnet. Recently, spin-filter Josephson junctions with ferromagnetic barriers have shown unique transport properties, when compared to standard metallic ferromagnetic junctions, due to the intrinsically non-dissipative nature of the tunneling process. Here we present the first extensive characterization of spin polarized Josephson junctions down to 0.3 K, and the first evidence of an incomplete 0 − π transition in highly spin polarized tunnel ferromagnetic junctions. Experimental data are consistent with a progressive enhancement of the magnetic activity with the increase of the barrier thickness, as neatly captured by the simplest theoretical approach including a non uniform exchange field. For very long junctions, unconventional magnetic activity of the barrier points to the presence of spin-triplet correlations.The interaction of superconductors with materials other than simple insulators or metals has made accessible a series of conceptually new challenges. Of particular interest to this work, Josephson junctions (JJs) with ferromagnetic materials separating two superconductors have been extensively characterized over the last decade. The simultaneous presence of the macroscopic phase coherence of superconductors and the exchange interaction of ferromagnetic materials is indeed of great value in the study of fundamental questions on possible pairing states in superconductors [1,2], demonstrating the presence of spin-polarized triplet supercurrents [3][4][5][6][7][8][9], and for potential applications in a wide range of cutting edge areas, such as spintronics [10,11], memory applications for high performance computing [12][13][14][15][16][17][18] and circuit components such as π shifters and phase qubits [19][20][21][22][23]. A playground where different forms of order can cooperate and interfere is of considerable value for inspiring other fields of physics [1,2].The existing literature focuses mostly on metallic superconductor/ferromagnet/superconductor (SFS) junctions, where the evidence of long-range spin triplet correlations is well established [3][4][5][6][7][8]: in the presence of equalspin Cooper pairs, the magnitude of the critical current I C decays much more slowly with magnetic barrier thickness than expected for standard singlet supercurrents [4,5]. In fact, spin-polarized Cooper pairs can survive at much longer length scales when compared to opposite spin Cooper pairs, and are practically immune to depairing induced by the presence of an exchange field [1,2]. Such junctions, together with superconducting spin valve devices, are likely to be the building blocks for future spintronic devices [11]. While metallic SFS junctions have been extensively characterized, the physics of ferromagnetic junctions with insulating barriers, l...

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The continuous development of superconducting electronics is encouraging several studies on hybrid Josephson junctions (JJs) based on superconductor/ferromagnet/superconductor (SFS) heterostructures, as either spintronic devices or switchable elements in quantum and classical circuits. Recent experimental evidence of macroscopic quantum tunneling and of an incomplete 0-π transition in tunnel-ferromagnetic spin-filter JJs could enhance the capabilities of SFS JJs also as active elements. Here, we provide a self-consistent electrodynamic characterization of NbN/GdN/NbN spin-filter JJs as a function of the barrier thickness, disentangling the highfrequency dissipation effects due to the environment from the intrinsic low-frequency dissipation processes. The fitting of the I −V characteristics at 4.2 K and at 300 mK by using the Tunnel Junction Microscopic model allows us to determine the subgap resistance R sg , the quality factor Q and the junction capacitance C. These results provide the scaling behavior of the electrodynamic parameters as a function of the barrier thickness, which represents a fundamental step for the feasibility of tunnel-ferromagnetic JJs as active elements in classical and quantum circuits, and are of general interest for tunnel junctions other than conventional SIS JJs.