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

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

doi:10.1063/1.4947489

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

Journal Article · Fri Apr 22 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4947489· OSTI ID:1674963

Peng, Jin ^[1]; ^[2]; ^[3]; Zhou, G. T. ^[3]; Liu, J. Y. ^[2]; Zhang, F. M. ^[3]; Wu, X. S. ^[3]; Mao, Z. Q. ^[2]

Nanjing Univ. (China); Tulane Univ., New Orleans, LA (United States); Louisiana State University
Tulane Univ., New Orleans, LA (United States)
Nanjing Univ. (China)

The current-perpendicular-to-plane magnetoresistivity (CPP-MR)/ρ_c(B) is investigated in single crystal ruthenates Ca₃(Ru_1-xTi_x)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 ρ_c(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. Finally, this eccentric CPP-MR behavior highlights the strong spin-charge coupling in double-layered ruthenates and provides a potential material for spintronic devices.

View Accepted Manuscript (DOE)

Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012432

OSTI ID:: 1674963

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 108; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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