Normal and inverse bulk spin valve effects in single-crystal ruthenates Article Swipe
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· 2016
· Open Access
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· DOI: https://doi.org/10.1063/1.4947489
· OA: W2337329643
The current-perpendicular-to-plane magnetoresistivity (CPP-MR)/ρc(B) is investigated in single crystal ruthenates Ca3(Ru1−xTix)2O7 (x = 0.02). This material is naturally composed of ferromagnetic metallic bilayers (Ru,Ti)O2 separated by nonmagnetic insulating layers of Ca2O2, resulting in tunneling magnetoresistivity. Non-monotonic ρc(B) curves as well as the inverse spin valve effect are observed around the magnetic phase transition associating with the metal-to-insulator transition. A spin dependent tunneling model with alternate distribution of hard and soft magnetic layers [(Ru,Ti)O2] is proposed to explain the exotic CPP-MR behavior. This eccentric CPP-MR behavior highlights the strong spin-charge coupling in double-layered ruthenates and provides a potential material for spintronic devices.
