Electron spin resonance probed suppressing of the cycloidal spin structure in doped bismuth ferrites

Lin, J. W.; Tang, Y. H.; Lue, C. S.; Lin, J. G.
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p232507
Academic Journal
The weak magnetism of bismuth ferrites Bi1-xDyxFeO3 with x=0.0 to 0.40 is studied via the electron spin resonance (ESR) of X-band (9.53 GHz) at various temperatures. The g-factor of pure BiFeO3 is 2.0, which originates from its cycloidal spin structure; while for the doped Bi1-xDyxFeO3 samples with x>0.10, ESR spectra reveal a second phase with a different g-factor around 1, which is attributed to the homogeneous magnetized phase of Bi1-xDyxFeO3. The temperature dependent ESR data further suggest a picture of the doping-induced transformation from cycloidal to canted antiferromagnetic state.


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