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

Title
Spin exchange interactions in hexagonal manganites RMnO3 (R Tb, Dy, Ho, Er) epitaxial thin films
Authors
Chen X.-B.Thi Minh Hien N.Lee D.Jang S.-Y.Noh T.W.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2011
Journal Title
Applied Physics Letters
ISSN
0003-6951JCR Link
Citation
vol. 99, no. 5
Indexed
SCI; SCIE; SCOPUS WOS scopus
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. © 2011 American Institute of Physics.
DOI
10.1063/1.3622768
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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