TY  - JOUR
AU  - Pradheesh, R.
AU  - Xiao, Yinguo
AU  - Cherian, Dona
AU  - Elizabeth, Suja
AU  - Hansen, Thomas
AU  - Chatterji, Tapan
AU  - Brückel, Th.
AU  - Nair, Harikrishnan
TI  - Magnetization-steps in Y$_{2}$CoMnO$_{6}$ double perovskite: The role of antisite disorder
JO  - Journal of applied physics
VL  - 116
IS  - 12
SN  - 1089-7550
CY  - Melville, NY
PB  - American Inst. of Physics
M1  - FZJ-2014-05278
SP  - 123907 
PY  - 2014
AB  - Antisite disorder is observed to have significant impact on the magnetic properties of the double perovskite Y2CoMnO6 which has been recently identified as a multiferroic. A paramagnetic-ferromagnetic phase transition occurs in this material at Tc ≈ 75 K. At 2 K, it displays a strong ferromagnetic hysteresis with a significant coercive field of Hc ≈ 15 kOe. Sharp steps are observed in the hysteresis curves recorded below 8 K. In the temperature range 2 K ≤ T ≤ 5 K, the hysteresis loops are anomalous as the virgin curve lies outside the main loop. The field-cooling conditions as well as the rate of field-sweep are found to influence the steps. Quantitative analysis of the neutron diffraction data shows that at room temperature, Y2CoMnO6 consists of 62% of monoclinic P21/n with nearly 70% antisite disorder and 38% Pnma. The bond valence sums indicate the presence of other valence states for Co and Mn which arise from disorder. We explain the origin of steps by using a model for pinning of magnetization at the antiphase boundaries created by antisite disorder. The steps in magnetization closely resemble the martensitic transformations found in intermetallics and display first-order characteristics as revealed in the Arrott's plots.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000342840000048
DO  - DOI:10.1063/1.4896399
UR  - https://juser.fz-juelich.de/record/171709
ER  -