Removal of the Magnetic Dead Layer by Geometric Design

Guo, Er-jia; Roldan, Manuel; Charlton, Timothy R.; Liao, Zhaoliang; Zheng, Qiang; Ambaye, Haile Arena; Herklotz, Andreas; Gai, Zheng; Ward, Thomas Zac; Lee, Ho Nyung; Fitzsimmons, Michael R.

doi:10.1002/adfm.201800922

Title: Removal of the Magnetic Dead Layer by Geometric Design

Journal Article · Mon May 28 00:00:00 EDT 2018 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201800922· OSTI ID:1439929

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Arizona State Univ., Tempe, AZ (United States). Eyring Materials Center
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

Abstract The proximity effect is used to engineer interface effects such as magnetoelectric coupling, exchange bias, and emergent interfacial magnetism. However, the presence of a magnetic “dead layer” adversely affects the functionality of a heterostructure. Here, it is shown that by utilizing (111) polar planes, the magnetization of a manganite ultrathin layer can be maintained throughout its thickness. Combining structural characterization, magnetometry measurements, and magnetization depth profiling with polarized neutron reflectometry, it is found that the magnetic dead layer is absent in the (111)‐oriented manganite layers, however, it occurs in the films with other orientations. Quantitative analysis of local structural and elemental spatial evolutions using scanning transmission electron microscopy and electron energy loss spectroscopy reveals that atomically sharp interfaces with minimal chemical intermixing in the (111)‐oriented superlattices. The polar discontinuity across the (111) interfaces inducing charge redistribution within the SrTiO ₃ layers is suggested, which promotes ferromagnetism throughout the (111)‐oriented ultrathin manganite layers. The approach of eliminating problematic magnetic dead layers by changing the crystallographic orientation suggests a conceptually useful recipe to engineer the intriguing physical properties of oxide interfaces, especially in low dimensionality.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1439929

Alternate ID(s):: OSTI ID: 1439259

Journal Information:: Advanced Functional Materials, Vol. 30; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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