Magnetic properties and dopant-dependent exchange bias in Ti-doped charge ordered Bi0.4Ca0.6MnO3

Authors

Xuebin Zhu, Chinese Academy of SciencesFollow
Yuping Sun, Materials Physics, Chinese Academy of Sciences
Dongqi Shi, University of WollongongFollow
Hechang Lei, Chinese Academy of Sciences
Shoubao Zhang, Chinese Academy of Sciences
Wenhai Song, Chinese Academy of Sciences
Zhaorong Yang, Chinese Academy of Sciences
Jianming Dai, Chinese Academy of Sciences
S X. Dou, University of WollongongFollow

RIS ID

31531

Publication Details

Zhu, X, Sun, Y, Shi, D, Lei, H, Zhang, S, Song, W, Yang, Z, Dai, J & Dou, SX (2009), Magnetic properties and dopant-dependent exchange bias in Ti-doped charge ordered Bi0.4Ca0.6MnO3, Journal of Physics D: Applied Physics, 42(18), pp. 1-5.

Abstract

Magnetic properties of charge ordered (CO) Bi_0.4Ca0_0.6Mn_1−xTi_xO₃ (0 ≤ x ≤ 0.2) are investigated. It is observed that the charge order temperature T_co is depressed gradually with Ti content increasing, and then disappears completely when x is 0.16. The high temperature magnetization and Curie temperature decrease with Ti content, whereas the low temperature magnetization and Curie temperature are increased. Moreover, exchange bias (EB) is observed in the field cooling mode for all samples. The relative EB parameters depend strongly on the Ti doping content. In particular, the exchange field shows a nonmonotonic variation with a maximum at Bi_0.4Ca_0.6Mn_0.92Ti_0.08O₃. The EB has been explained in terms of the density of ferromagnetic nanodomains superposed on the antiferromagnetic matrix. The results suggest that it is possible to tune the EB through the Mn-site doping in CO manganites by controlling the density of ferromagnetic nanodomains.