Nature of weak magnetism in SrTiO3/LaAlO3 multilayers

Z. Salman; O. Ofer; M. Radovic; H. Hao; M. Ben Shalom; K. H. Chow; Y. Dagan; M. D. Hossain; C. D.P. Levy; W. A. MacFarlane; G. M. Morris; L. Patthey; M. R. Pearson; H. Saadaoui; T. Schmitt; D. Wang; R. F. Kiefl

doi:10.1103/PhysRevLett.109.257207

Nature of weak magnetism in SrTiO₃/LaAlO₃ multilayers

Z. Salman^*, O. Ofer, M. Radovic, H. Hao, M. Ben Shalom, K. H. Chow, Y. Dagan, M. D. Hossain, C. D.P. Levy, W. A. MacFarlane, G. M. Morris, L. Patthey, M. R. Pearson, H. Saadaoui, T. Schmitt, D. Wang, R. F. Kiefl

^*Corresponding author for this work

School of Physics and Astronomy

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

65 Scopus citations

Abstract

We report the observation of weak magnetism in superlattices of LaAlO ₃/SrTiO₃ using β-detected nuclear magnetic resonance. The spin lattice relaxation rate of Li8 in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO₃ exhibits a strong peak near ∼35 K, whereas no such peak is observed in a superlattice with spacer layer thickness of 3 unit cells. We attribute the observed temperature dependence to slowing down of weakly coupled electronic moments at the LaAlO ₃/SrTiO₃ interface. These results show that the magnetism at the interface depends strongly on the thickness of the spacer layer, and that a minimal thickness of ∼4-6 unit cells is required for the appearance of magnetism. A simple model is used to determine that the observed relaxation is due to small fluctuating moments (∼0.002μ_B) in the two samples with a larger LaAlO₃ spacer thickness.

Original language	English
Article number	257207
Journal	Physical Review Letters
Volume	109
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.109.257207
State	Published - 20 Dec 2012

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Salman, Z., Ofer, O., Radovic, M., Hao, H., Ben Shalom, M., Chow, K. H., Dagan, Y., Hossain, M. D., Levy, C. D. P., MacFarlane, W. A., Morris, G. M., Patthey, L., Pearson, M. R., Saadaoui, H., Schmitt, T., Wang, D., & Kiefl, R. F. (2012). Nature of weak magnetism in SrTiO₃/LaAlO₃ multilayers. Physical Review Letters, 109(25), Article 257207. https://doi.org/10.1103/PhysRevLett.109.257207

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title = "Nature of weak magnetism in SrTiO3/LaAlO3 multilayers",

abstract = "We report the observation of weak magnetism in superlattices of LaAlO 3/SrTiO3 using β-detected nuclear magnetic resonance. The spin lattice relaxation rate of Li8 in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO3 exhibits a strong peak near ∼35 K, whereas no such peak is observed in a superlattice with spacer layer thickness of 3 unit cells. We attribute the observed temperature dependence to slowing down of weakly coupled electronic moments at the LaAlO 3/SrTiO3 interface. These results show that the magnetism at the interface depends strongly on the thickness of the spacer layer, and that a minimal thickness of ∼4-6 unit cells is required for the appearance of magnetism. A simple model is used to determine that the observed relaxation is due to small fluctuating moments (∼0.002μB) in the two samples with a larger LaAlO3 spacer thickness.",

author = "Z. Salman and O. Ofer and M. Radovic and H. Hao and {Ben Shalom}, M. and Chow, {K. H.} and Y. Dagan and Hossain, {M. D.} and Levy, {C. D.P.} and MacFarlane, {W. A.} and Morris, {G. M.} and L. Patthey and Pearson, {M. R.} and H. Saadaoui and T. Schmitt and D. Wang and Kiefl, {R. F.}",

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doi = "10.1103/PhysRevLett.109.257207",

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T1 - Nature of weak magnetism in SrTiO3/LaAlO3 multilayers

AU - Salman, Z.

AU - Ofer, O.

AU - Radovic, M.

AU - Hao, H.

AU - Ben Shalom, M.

AU - Chow, K. H.

AU - Dagan, Y.

AU - Hossain, M. D.

AU - Levy, C. D.P.

AU - MacFarlane, W. A.

AU - Morris, G. M.

AU - Patthey, L.

AU - Pearson, M. R.

AU - Saadaoui, H.

AU - Schmitt, T.

AU - Wang, D.

AU - Kiefl, R. F.

PY - 2012/12/20

Y1 - 2012/12/20

N2 - We report the observation of weak magnetism in superlattices of LaAlO 3/SrTiO3 using β-detected nuclear magnetic resonance. The spin lattice relaxation rate of Li8 in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO3 exhibits a strong peak near ∼35 K, whereas no such peak is observed in a superlattice with spacer layer thickness of 3 unit cells. We attribute the observed temperature dependence to slowing down of weakly coupled electronic moments at the LaAlO 3/SrTiO3 interface. These results show that the magnetism at the interface depends strongly on the thickness of the spacer layer, and that a minimal thickness of ∼4-6 unit cells is required for the appearance of magnetism. A simple model is used to determine that the observed relaxation is due to small fluctuating moments (∼0.002μB) in the two samples with a larger LaAlO3 spacer thickness.

AB - We report the observation of weak magnetism in superlattices of LaAlO 3/SrTiO3 using β-detected nuclear magnetic resonance. The spin lattice relaxation rate of Li8 in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO3 exhibits a strong peak near ∼35 K, whereas no such peak is observed in a superlattice with spacer layer thickness of 3 unit cells. We attribute the observed temperature dependence to slowing down of weakly coupled electronic moments at the LaAlO 3/SrTiO3 interface. These results show that the magnetism at the interface depends strongly on the thickness of the spacer layer, and that a minimal thickness of ∼4-6 unit cells is required for the appearance of magnetism. A simple model is used to determine that the observed relaxation is due to small fluctuating moments (∼0.002μB) in the two samples with a larger LaAlO3 spacer thickness.

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Nature of weak magnetism in SrTiO₃/LaAlO₃ multilayers

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