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Title: Determination of magnetic parameters in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} thin films using EMCD

Abstract

It is well known that the magnetic state of the La{sub 0.7}Sr{sub 0.3}MnO{sub 3} (LSMO) thin-film heterostructure is strongly correlated with the lattice, spin, orbital, and charge states, since these influence the electric and magnetic transport properties even on the unit-cell level. Therefore, understanding the material's magnetic properties on the nanoscale is important for the development of novel applications. The recently developed electron magnetic-circular dichroism (EMCD) technique allows the determination of atomic site-specific magnetic information via the use of transmitted electrons; however, its sensitivity is not high enough to quantitatively acquire magnetic information in many weak magnetism systems. Here, we utilized a dynamical diffraction-effect assisted EMCD technique to quantitatively determine the spin and orbital magnetic moment of LSMO/SrTiO{sub 3} thin films on the nanometer scale using a transmission electron microscope. Further, data processing was optimized to enhance the intensity of the EMCD signals for manganese, which have very weak magnetism at room temperature. High signal-to-noise ratio and accurate quantitative magnetic measurement are eventually achieved. Finally, the spin magnetic moments (0.73 ± 0.26 μ{sub B}) are derived, and we also limited the ratio of the orbital to spin magnetic moment within an interval of (−0.03, 0.01). Our results not only present the nanoscale magneticmore » parameters of LSMO/SrTiO{sub 3}, but also demonstrate how the measurement limit of the spin (or orbital) magnetic moment can be achieved, which is via the developed dynamical diffraction effect assisted EMCD technique.« less

Authors:
; ; ;  [1]
  1. National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE) and the State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22590795
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 24; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHARGE STATES; DATA PROCESSING; DIFFRACTION; MAGNETIC CIRCULAR DICHROISM; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETISM; MANGANESE; NANOSTRUCTURES; NOISE; SENSITIVITY; SIGNALS; SIGNAL-TO-NOISE RATIO; SPIN; STRONTIUM TITANATES; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Li, Gen, Song, Dongsheng, Li, Zhi Peng, and Zhu, Jing, E-mail: jzhu@mail.tsinghua.edu.cn. Determination of magnetic parameters in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} thin films using EMCD. United States: N. p., 2016. Web. doi:10.1063/1.4954168.
Li, Gen, Song, Dongsheng, Li, Zhi Peng, & Zhu, Jing, E-mail: jzhu@mail.tsinghua.edu.cn. Determination of magnetic parameters in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} thin films using EMCD. United States. doi:10.1063/1.4954168.
Li, Gen, Song, Dongsheng, Li, Zhi Peng, and Zhu, Jing, E-mail: jzhu@mail.tsinghua.edu.cn. Mon . "Determination of magnetic parameters in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} thin films using EMCD". United States. doi:10.1063/1.4954168.
@article{osti_22590795,
title = {Determination of magnetic parameters in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} thin films using EMCD},
author = {Li, Gen and Song, Dongsheng and Li, Zhi Peng and Zhu, Jing, E-mail: jzhu@mail.tsinghua.edu.cn},
abstractNote = {It is well known that the magnetic state of the La{sub 0.7}Sr{sub 0.3}MnO{sub 3} (LSMO) thin-film heterostructure is strongly correlated with the lattice, spin, orbital, and charge states, since these influence the electric and magnetic transport properties even on the unit-cell level. Therefore, understanding the material's magnetic properties on the nanoscale is important for the development of novel applications. The recently developed electron magnetic-circular dichroism (EMCD) technique allows the determination of atomic site-specific magnetic information via the use of transmitted electrons; however, its sensitivity is not high enough to quantitatively acquire magnetic information in many weak magnetism systems. Here, we utilized a dynamical diffraction-effect assisted EMCD technique to quantitatively determine the spin and orbital magnetic moment of LSMO/SrTiO{sub 3} thin films on the nanometer scale using a transmission electron microscope. Further, data processing was optimized to enhance the intensity of the EMCD signals for manganese, which have very weak magnetism at room temperature. High signal-to-noise ratio and accurate quantitative magnetic measurement are eventually achieved. Finally, the spin magnetic moments (0.73 ± 0.26 μ{sub B}) are derived, and we also limited the ratio of the orbital to spin magnetic moment within an interval of (−0.03, 0.01). Our results not only present the nanoscale magnetic parameters of LSMO/SrTiO{sub 3}, but also demonstrate how the measurement limit of the spin (or orbital) magnetic moment can be achieved, which is via the developed dynamical diffraction effect assisted EMCD technique.},
doi = {10.1063/1.4954168},
journal = {Applied Physics Letters},
number = 24,
volume = 108,
place = {United States},
year = {Mon Jun 13 00:00:00 EDT 2016},
month = {Mon Jun 13 00:00:00 EDT 2016}
}