Antiferromagnetic spin glass-like behavior in sintered multiferroic Aurivillius Bim+1Ti3Fem-3O3m+3 compounds

作者：Jartych E^*; Pikula T; Mazurek M; Lisinska Czekaj A; Czekaj D; Gaska K; Przewoznik J; Kapusta C; Surowiec Z

来源：Journal of Magnetism and Magnetic Materials, 2013, 342: 27-34.

DOI：10.1016/j.jmmm.2013.04.046

• Aurivillius phase
• Multiferroic
• Magnetic property
• Hyperfine interaction
• Mossbauer spectroscopy

The structure, hyperfine interactions and magnetic properties of the series of multiferroic Bim+1Ti3Fem-3O3m+3 Aurivillius compounds with m=4-8 were studied using X-ray diffraction, Fe-57 Mossbauer spectroscopy and vibrating sample magnetometry. Samples were prepared by the conventional solid-state sintering method. Bulk magnetic measurements showed that for m=4 the compound is paramagnetic down to 2 K while in the compound with m=5 the antiferromagnetic type transition was observed at 11 K. In the case of compounds with m=6-8 much more complex magnetic behavior was found. For these compounds a gradual spin freezing and antiferromagnetic spin glass-like ordering were observed on decreasing temperature. The temperature of spin glass freezing was determined as 260, 280 and 350 K for m=6, 7 and 8, respectively. Room-temperature Mossbauer spectra of all the compounds studied confirm their paramagnetic state. However, liquid nitrogen and liquid helium temperature measurements reveal magnetic ordering with a residual paramagnetic phase contribution for the compounds with m=58.

• 出版日期2013-9