Spin exchange interactions in hexagonal manganites RMnO3 (R Tb, Dy, Ho, Er) epitaxial thin films

Xiang Bai Chen; Nguyen Thi Minh Hien; D. Lee; S. Y. Jang; T. W. Noh; In Sang Yang

doi:10.1063/1.3622768

Spin exchange interactions in hexagonal manganites RMnO₃ (R Tb, Dy, Ho, Er) epitaxial thin films

Xiang Bai Chen, Nguyen Thi Minh Hien, D. Lee, S. Y. Jang, T. W. Noh, In Sang Yang

Department of Physics

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

8 Scopus citations

Abstract

We present the results of an optical method of quantitatively estimating the spin exchange interactions in hexagonal manganites RMnO₃ (R=Tb, Dy, Ho, Er) epitaxial thin films. The two in-plane (a-b plane) spin exchange integrals J₁ (intratrimer Mn-Mn interaction) and J₂ (intertrimer Mn-Mn interaction) are deduced from the magnon scattering peak wavenumbers. We found that J₂ decreases systematically when the R ionic radius increases, while J₁ is nearly independent of R ionic radius, contrary to the expectation in single crystals. We show that the R dependence of J₁ could be understood in terms of the stress in the thin films. Our result indicates that the stress has stronger effect on the atomic displacement of the intratrimer Mn-Mn distance than the intertrimer Mn-Mn distance.

Original language	English
Article number	052506
Journal	Applied Physics Letters
Volume	99
Issue number	5
DOIs	https://doi.org/10.1063/1.3622768
State	Published - 1 Aug 2011

Bibliographical note

Funding Information:
We thank the National Research Foundation of Korea Grant Nos. 2009-0063320 and 2010-0022857. The work at Seoul National University was supported by the National Research Foundation of Korea Grant Nos. 2009-0080567 and 2010-0020416.

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10.1063/1.3622768

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title = "Spin exchange interactions in hexagonal manganites RMnO3 (R Tb, Dy, Ho, Er) epitaxial thin films",

abstract = "We present the results of an optical method of quantitatively estimating the spin exchange interactions in hexagonal manganites RMnO3 (R=Tb, Dy, Ho, Er) epitaxial thin films. The two in-plane (a-b plane) spin exchange integrals J1 (intratrimer Mn-Mn interaction) and J2 (intertrimer Mn-Mn interaction) are deduced from the magnon scattering peak wavenumbers. We found that J2 decreases systematically when the R ionic radius increases, while J1 is nearly independent of R ionic radius, contrary to the expectation in single crystals. We show that the R dependence of J1 could be understood in terms of the stress in the thin films. Our result indicates that the stress has stronger effect on the atomic displacement of the intratrimer Mn-Mn distance than the intertrimer Mn-Mn distance.",

author = "Chen, {Xiang Bai} and {Thi Minh Hien}, Nguyen and D. Lee and Jang, {S. Y.} and Noh, {T. W.} and Yang, {In Sang}",

note = "Funding Information: We thank the National Research Foundation of Korea Grant Nos. 2009-0063320 and 2010-0022857. The work at Seoul National University was supported by the National Research Foundation of Korea Grant Nos. 2009-0080567 and 2010-0020416. ",

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T1 - Spin exchange interactions in hexagonal manganites RMnO3 (R Tb, Dy, Ho, Er) epitaxial thin films

AU - Chen, Xiang Bai

AU - Thi Minh Hien, Nguyen

AU - Lee, D.

AU - Jang, S. Y.

AU - Noh, T. W.

AU - Yang, In Sang

N1 - Funding Information: We thank the National Research Foundation of Korea Grant Nos. 2009-0063320 and 2010-0022857. The work at Seoul National University was supported by the National Research Foundation of Korea Grant Nos. 2009-0080567 and 2010-0020416.

PY - 2011/8/1

Y1 - 2011/8/1

N2 - We present the results of an optical method of quantitatively estimating the spin exchange interactions in hexagonal manganites RMnO3 (R=Tb, Dy, Ho, Er) epitaxial thin films. The two in-plane (a-b plane) spin exchange integrals J1 (intratrimer Mn-Mn interaction) and J2 (intertrimer Mn-Mn interaction) are deduced from the magnon scattering peak wavenumbers. We found that J2 decreases systematically when the R ionic radius increases, while J1 is nearly independent of R ionic radius, contrary to the expectation in single crystals. We show that the R dependence of J1 could be understood in terms of the stress in the thin films. Our result indicates that the stress has stronger effect on the atomic displacement of the intratrimer Mn-Mn distance than the intertrimer Mn-Mn distance.

AB - We present the results of an optical method of quantitatively estimating the spin exchange interactions in hexagonal manganites RMnO3 (R=Tb, Dy, Ho, Er) epitaxial thin films. The two in-plane (a-b plane) spin exchange integrals J1 (intratrimer Mn-Mn interaction) and J2 (intertrimer Mn-Mn interaction) are deduced from the magnon scattering peak wavenumbers. We found that J2 decreases systematically when the R ionic radius increases, while J1 is nearly independent of R ionic radius, contrary to the expectation in single crystals. We show that the R dependence of J1 could be understood in terms of the stress in the thin films. Our result indicates that the stress has stronger effect on the atomic displacement of the intratrimer Mn-Mn distance than the intertrimer Mn-Mn distance.

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