Angular dependence of tunneling magnetoresistance in La 0.7 Sr 0.3 MnO 3 step-edge junctions

L. M. Wang, Jyh Yi Lee, H. C. Yang, J. C. Chen, Hsiang Lin Liu, Kun Sheng Lu, Lance Horng, H. E. Horng

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

La 0.7 Sr 0.3 MnO 3 (LSMO) tunneling magnetoresistance (TMR) junctions have been fabricated on step-edge (0 0 1) SrTiO 3 substrates with a high step-edge angle. In the measurement of magnetoresistance (MR) ratio versus external magnetic field H, butterfly-like MR curves are clearly observed. The MR(H) curves vary with θ, the angle between the applied magnetic field and the current direction in the substrate plane, showing anisotropic MR properties. A much broader MR(H) response is observed for the configuration of H perpendicular to the substrate plane. Additionally, the maxima-MR field H p almost coincides with the coercive field H c for θ<60° but obeys a different form from Hc(θ). The high-field junction resistance shows an intrinsic sin2θ angular dependence, while the low-field resistance shows an extrinsic cos(4θ) angular dependence. The distinctive features are mainly due to the induced magnetization anisotropy in the artificial steps of grain boundaries.

Original languageEnglish
Pages (from-to)48-55
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume298
Issue number1
DOIs
Publication statusPublished - 2006 Mar 1

Fingerprint

Tunnelling magnetoresistance
Magnetoresistance
curves
magnetic fields
Substrates
Enhanced magnetoresistance
Magnetic fields
grain boundaries
magnetization
anisotropy
configurations
Magnetization
Grain boundaries
Anisotropy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Wang, L. M. ; Lee, Jyh Yi ; Yang, H. C. ; Chen, J. C. ; Liu, Hsiang Lin ; Lu, Kun Sheng ; Horng, Lance ; Horng, H. E. / Angular dependence of tunneling magnetoresistance in La 0.7 Sr 0.3 MnO 3 step-edge junctions In: Journal of Magnetism and Magnetic Materials. 2006 ; Vol. 298, No. 1. pp. 48-55.
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abstract = "La 0.7 Sr 0.3 MnO 3 (LSMO) tunneling magnetoresistance (TMR) junctions have been fabricated on step-edge (0 0 1) SrTiO 3 substrates with a high step-edge angle. In the measurement of magnetoresistance (MR) ratio versus external magnetic field H, butterfly-like MR curves are clearly observed. The MR(H) curves vary with θ, the angle between the applied magnetic field and the current direction in the substrate plane, showing anisotropic MR properties. A much broader MR(H) response is observed for the configuration of H perpendicular to the substrate plane. Additionally, the maxima-MR field H p almost coincides with the coercive field H c for θ<60° but obeys a different form from Hc(θ). The high-field junction resistance shows an intrinsic sin2θ angular dependence, while the low-field resistance shows an extrinsic cos(4θ) angular dependence. The distinctive features are mainly due to the induced magnetization anisotropy in the artificial steps of grain boundaries.",
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Angular dependence of tunneling magnetoresistance in La 0.7 Sr 0.3 MnO 3 step-edge junctions . / Wang, L. M.; Lee, Jyh Yi; Yang, H. C.; Chen, J. C.; Liu, Hsiang Lin; Lu, Kun Sheng; Horng, Lance; Horng, H. E.

In: Journal of Magnetism and Magnetic Materials, Vol. 298, No. 1, 01.03.2006, p. 48-55.

Research output: Contribution to journalArticle

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AU - Wang, L. M.

AU - Lee, Jyh Yi

AU - Yang, H. C.

AU - Chen, J. C.

AU - Liu, Hsiang Lin

AU - Lu, Kun Sheng

AU - Horng, Lance

AU - Horng, H. E.

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N2 - La 0.7 Sr 0.3 MnO 3 (LSMO) tunneling magnetoresistance (TMR) junctions have been fabricated on step-edge (0 0 1) SrTiO 3 substrates with a high step-edge angle. In the measurement of magnetoresistance (MR) ratio versus external magnetic field H, butterfly-like MR curves are clearly observed. The MR(H) curves vary with θ, the angle between the applied magnetic field and the current direction in the substrate plane, showing anisotropic MR properties. A much broader MR(H) response is observed for the configuration of H perpendicular to the substrate plane. Additionally, the maxima-MR field H p almost coincides with the coercive field H c for θ<60° but obeys a different form from Hc(θ). The high-field junction resistance shows an intrinsic sin2θ angular dependence, while the low-field resistance shows an extrinsic cos(4θ) angular dependence. The distinctive features are mainly due to the induced magnetization anisotropy in the artificial steps of grain boundaries.

AB - La 0.7 Sr 0.3 MnO 3 (LSMO) tunneling magnetoresistance (TMR) junctions have been fabricated on step-edge (0 0 1) SrTiO 3 substrates with a high step-edge angle. In the measurement of magnetoresistance (MR) ratio versus external magnetic field H, butterfly-like MR curves are clearly observed. The MR(H) curves vary with θ, the angle between the applied magnetic field and the current direction in the substrate plane, showing anisotropic MR properties. A much broader MR(H) response is observed for the configuration of H perpendicular to the substrate plane. Additionally, the maxima-MR field H p almost coincides with the coercive field H c for θ<60° but obeys a different form from Hc(θ). The high-field junction resistance shows an intrinsic sin2θ angular dependence, while the low-field resistance shows an extrinsic cos(4θ) angular dependence. The distinctive features are mainly due to the induced magnetization anisotropy in the artificial steps of grain boundaries.

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