Normal and inverse bulk spin valve effects in single-crystal ruthenates

Jin Peng, J. Hu, X. M. Gu, G. T. Zhou, J. Y. Liu, F. M. Zhang, X. S. Wu, Z. Q. Mao

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Abstract

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.

Original languageEnglish (US)
Article number162402
JournalApplied Physics Letters
Volume108
Issue number16
DOIs
StatePublished - Apr 18 2016

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Peng, J., Hu, J., Gu, X. M., Zhou, G. T., Liu, J. Y., Zhang, F. M., Wu, X. S., & Mao, Z. Q. (2016). Normal and inverse bulk spin valve effects in single-crystal ruthenates. Applied Physics Letters, 108(16), [162402]. https://doi.org/10.1063/1.4947489