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Title: The ac-magnetic susceptibility and dielectric response of complex spin ordering processes in Mn₃O₄

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}.
Authors:
 [1] ;  [2] ;  [3] ; ; ;  [4] ;  [1] ;  [5]
  1. Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039 (India)
  2. (France)
  3. (India)
  4. Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, 14050 Caen (France)
  5. Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur 208016 (India)
Publication Date:
OSTI Identifier:
22305958
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; HYSTERESIS; MAGNETIC PROPERTIES; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MANGANESE OXIDES; NEEL TEMPERATURE; PERMITTIVITY; SPIN; SPIN ORIENTATION; TEMPERATURE RANGE 0013-0065 K