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Title: Strain dependence of antiferromagnetic interface coupling in La 0.7Sr 0.3MnO 3/SrRuO 3 superlattices

We have investigated the magnetic response of La 0.7Sr 0.3MnO 3/SrRuO 3 superlattices to biaxial in-plane strain applied in situ. Superlattices grown on piezoelectric substrates of 0.72PbMg 1/3Nb 2/3O 3-0.28PbTiO 3(001) (PMN-PT) show strong antiferromagnetic coupling of the two ferromagnetic components. The coupling field of mu H-0(AF) = 1.8 T is found to change by mu(0)Delta H-AF/Delta epsilon similar to -520 mT %(-1) under reversible biaxial strain Delta epsilon at 80 K in a [La 0.7Sr 0.3MnO 3(22 angstrom)/SrRuO 3(55 angstrom)] 15 superlattice. This reveals a significant strain effect on interfacial coupling. The applied in-plane compression enhances the ferromagnetic order in the manganite layers, which are under as-grown tensile strain, leading to a larger net coupling of SrRuO 3 layers at the interface. It is thus difficult to disentangle the contributions from strain-dependent antiferromagnetic Mn-O-Ru interface coupling and Mn-O-Mn ferromagnetic double exchange near the interface for the strength of the apparent antiferromagnetic coupling. We discuss our results in the framework of available models.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Martin-Luther Univ., Halle-Wittenberg (Germany); IFW, Dresden (Germany)
  2. Martin-Luther Univ., Halle-Wittenberg (Germany); IFW, Dresden (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Max Planck Inst. for Microstructure Physics, Halle (Germany)
  4. Martin-Luther Univ., Halle-Wittenberg (Germany); IFW, Dresden (Germany); Johannes Gutenberg Univ., Mainz (Germany)
  5. Martin-Luther University Halle-Wittenberg, Germany; Martin-Luther Univ., Halle-Wittenberg (Germany); IFW, Dresden (Germany)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 91; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1360035

Das, Sujit, Herklotz, Andreas, Pippel, Eckhard, Guo, Erjia, Rata, Diana, and Doerr, Kathrin. Strain dependence of antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices. United States: N. p., Web. doi:10.1103/PhysRevB.91.134405.
Das, Sujit, Herklotz, Andreas, Pippel, Eckhard, Guo, Erjia, Rata, Diana, & Doerr, Kathrin. Strain dependence of antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices. United States. doi:10.1103/PhysRevB.91.134405.
Das, Sujit, Herklotz, Andreas, Pippel, Eckhard, Guo, Erjia, Rata, Diana, and Doerr, Kathrin. 2015. "Strain dependence of antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices". United States. doi:10.1103/PhysRevB.91.134405. https://www.osti.gov/servlets/purl/1360035.
@article{osti_1360035,
title = {Strain dependence of antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices},
author = {Das, Sujit and Herklotz, Andreas and Pippel, Eckhard and Guo, Erjia and Rata, Diana and Doerr, Kathrin},
abstractNote = {We have investigated the magnetic response of La0.7Sr0.3MnO3/SrRuO3 superlattices to biaxial in-plane strain applied in situ. Superlattices grown on piezoelectric substrates of 0.72PbMg1/3Nb2/3O3-0.28PbTiO3(001) (PMN-PT) show strong antiferromagnetic coupling of the two ferromagnetic components. The coupling field of mu H-0(AF) = 1.8 T is found to change by mu(0)Delta H-AF/Delta epsilon similar to -520 mT %(-1) under reversible biaxial strain Delta epsilon at 80 K in a [La0.7Sr0.3MnO3(22 angstrom)/SrRuO3(55 angstrom)]15 superlattice. This reveals a significant strain effect on interfacial coupling. The applied in-plane compression enhances the ferromagnetic order in the manganite layers, which are under as-grown tensile strain, leading to a larger net coupling of SrRuO3 layers at the interface. It is thus difficult to disentangle the contributions from strain-dependent antiferromagnetic Mn-O-Ru interface coupling and Mn-O-Mn ferromagnetic double exchange near the interface for the strength of the apparent antiferromagnetic coupling. We discuss our results in the framework of available models.},
doi = {10.1103/PhysRevB.91.134405},
journal = {Physical Review B},
number = 13,
volume = 91,
place = {United States},
year = {2015},
month = {4}
}