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Interplay of Fe and Tm moments through the spin-reorientation transition in TmFeO3

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author U. Staub, L. Rettig, E. M. Bothschafter, Y. W. Windsor, M. Ramakrishnan, S. R. V. Avula, J. Dreiser, C. Piamonteze , V. Scagnoli, S. Mukherjee, C. Niedermayer, M. Medarde, E. Pomjakushina,
Project Structural and magneto-electric properties of strained REMnO3 films
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 96(17)
Page(s) 174408-1 - 174408-11
Title of proceedings Physical Review B
DOI 10.1103/physrevb.96.174408

Abstract

X-ray magnetic circular dichroism (XMCD) and x-ray magnetic linear dichroism (XMLD) have been used to investigate the Fe magnetic response during the spin-reorientation transition (SRT) in TmFeO3. Comparing the Fe XMLD results with neutron-diffraction and magnetization measurements on the same sample indicates that the SRT has an enhanced temperature range in the near surface region of approximately 82 to 120 K compared to approximately 82 to 92 K in bulk. This view is supported by complementary resonant soft x-ray-diffraction experiments at the Tm M5 edge. These measurements find an induced magnetic moment on the Tm sites, which is well described by a dipolar mean-field model originating from the Fe moments. Even though such a model can describe the 4f response in the experiments, it is insufficient to describe the SRT even when considering a change in the 4f anisotropy. Moreover, the results of the Fe XMCD show a different temperature evolution through the SRT, the interpretation of which is hampered by additional spectral shape changes of the XCMD signal.
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