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

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons104701

Rettig,  Laurenz
Swiss Light Source, Paul Scherrer Institut;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons203272

Windsor,  Yaov William
Swiss Light Source, Paul Scherrer Institut;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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PhysRevB.96.174408.pdf
(Publisher version), 3MB

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Citation

Staub, U., Rettig, L., Bothschafter, E. M., Windsor, Y. W., Ramakrishnan, M., Avula, S. R. V., et al. (2017). Interplay of Fe and Tm moments through the spin-reorientation transition in TmFeO3. Physical Review B, 96(17): 174408. doi:10.1103/PhysRevB.96.174408.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-32A4-6
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 4ƒ response in the experiments, it is insufficient to describe the SRT even when considering a change in the 4ƒ 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.