The ac-magnetic susceptibility and dielectric response of complex spin ordering processes in Mn₃O₄
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039 (India)
- Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, 14050 Caen (France)
- Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur 208016 (India)
We report a meticulous study of the ac-magnetization dynamics (χ{sub ac}(T)), relative dielectric permittivity ε{sub r}(T), and magneto-dielectric (Δε{sub r}/ε{sub r}(H)) response of various complex magnetic transitions that occur below the ferrimagnetic Néel temperature T{sub N} of Mn₃O₄. Besides the known sequence of transitions at T{sub N}~42.75 K, T₁~39 K, and T₂~34 K, the existence of a new anomaly reported recently at 38 K (T*) has been successfully probed by χ{sub ac}(T) and ε{sub r}(T) measurements. The effect of external dc-bias fields (H{sub DC}) and driving frequency (f) on the above mentioned transitions has been investigated in consonance with the ε{sub r}(T) and Δε{sub r}/ε{sub r}(T,H) results. For the first time, we observed a clear hysteresis of about 5.15 K in the zero-field ε{sub r}(T) across the incommensurate-to-commensurate transition T₂~34 K, which provides evidence to the first-order nature of this transition. The Arrott plot (H/M vs. M²}) criterion has been used to distinguish the nature of all the sequential transitions that take place below T{sub N}.
- OSTI ID:
- 22305958
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Multiferroicity and magneto-electric effect in Gd{sub 2}BaNiO{sub 5}
Magnetic properties and critical behavior of Fe(tetracyanoethylene){sub 2}(centre dot)x(CH{sub 2}Cl{sub 2}): A high-T{sub c} molecule-based magnet