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

doi:10.1063/1.4947489

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

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The current-perpendicular-to-plane magnetoresistivity (CPP-MR) /ρc(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 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 language	English (US)
Article number	162402
Journal	Applied Physics Letters
Volume	108
Issue number	16
DOIs	https://doi.org/10.1063/1.4947489
State	Published - Apr 18 2016

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4947489

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@article{e44db29c29114b9c88e9a72cccd7a44e,

title = "Normal and inverse bulk spin valve effects in single-crystal ruthenates",

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.",

author = "Jin Peng and J. Hu and Gu, {X. M.} and Zhou, {G. T.} and Liu, {J. Y.} and Zhang, {F. M.} and Wu, {X. S.} and Mao, {Z. Q.}",

note = "Funding Information: This work at Nanjing University was supported by the Natural Science Foundation of China (Nos. 11304149, U1332205, 11274153, 11204124, and 51202108). The Work at Tulane University was supported by the U.S. Department of Energy under EPSCOR Grant No. DE-SC0012432 with additional support from the Louisiana Board of Regents (support for crystal growth and magnetic measurements). Publisher Copyright: {\textcopyright} 2016 Author(s).",

year = "2016",

month = apr,

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doi = "10.1063/1.4947489",

language = "English (US)",

volume = "108",

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T1 - Normal and inverse bulk spin valve effects in single-crystal ruthenates

AU - Peng, Jin

AU - Hu, J.

AU - Gu, X. M.

AU - Zhou, G. T.

AU - Liu, J. Y.

AU - Zhang, F. M.

AU - Wu, X. S.

AU - Mao, Z. Q.

N1 - Funding Information: This work at Nanjing University was supported by the Natural Science Foundation of China (Nos. 11304149, U1332205, 11274153, 11204124, and 51202108). The Work at Tulane University was supported by the U.S. Department of Energy under EPSCOR Grant No. DE-SC0012432 with additional support from the Louisiana Board of Regents (support for crystal growth and magnetic measurements). Publisher Copyright: © 2016 Author(s).

PY - 2016/4/18

Y1 - 2016/4/18

N2 - 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.

AB - 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.

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ER -

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

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