TY  - JOUR
AU  - Singha, A. D.
AU  - Seehra, M. S.
AU  - Skoulatos, M.
AU  - Sarkar, T.
AU  - Pramanik, P.
AU  - Chowdhury, Sourav
AU  - Hoesch, M.
AU  - Reehuis, M.
AU  - Többens, D. M.
AU  - Raghu, A.
AU  - Kaushik, S. D.
AU  - Thota, Subhash
TI  - Anisotropy driven spin–reorientation, and two–step magnetic ordering in cubic semiconducting spinel Cr<sub>0.1</sub>Mn<sub>0.9</sub>Fe<sub>0.2</sub>Co<sub>1.8</sub>O<sub>4</sub> 
JO  - Journal of physics / Condensed matter
VL  - 37
IS  - 22
SN  - 0953-8984
CY  - Bristol
PB  - IOP Publ.
M1  - PUBDB-2025-05160
SP  - 225802
PY  - 2025
N1  - Waiting for fulltext 
AB  - The nature of magnetism in the cubic spinel Cr<sub>0.1</sub>Mn_0.9Fe_0.2Co_1.8O_4 is reported based onsystematic investigations by means of magnetization (M), ac susceptibility (χ) and heat capacity (C_P) measurements, as well as by neutron diffraction. Structural characterization of the samplewas done using x−ray absorption spectroscopy, neutron and synchrotron diffraction. The M vs. Tvariation in different magnetic fields indicate ferrimagnetic ordering below T_C = 230 K,followed by a magnetic field and anisotropy induced spin reorientation at TSR ∼150 K. Withincreasing T starting from 2 K, the coercivity HC and anisotropy field HK decrease and becomenegligible for T  >  T_SR. A model to explain the HC vs. T data shows that TSR is due toreorientation of M along H when H  >  H_K. The C_P vs. T data shows a weak λ −type anomaly atTC with changes in magnetic entropy smaller than those observed below TSR suggesting thatlong−range magnetic ordering is completed below T_SR. For T_SR  <  T  <  T_C, the presence ofweakly interacting magnetic clusters having weak short−range interactions is evident based onanalysis of magnetization and ac susceptibilities. Exchange constants (J_AA/k_B = 7.9 K, J_AB/k_B = 22.6 K and J_BB/k_B = –5.3 K) are determined from the temperature dependence of paramagneticsusceptibility for T  >  T_C. This analysis also shows the low−spin S = 0 state of Co^3+ ions on the B sites which along with negligible H_K for T_SR  <  T  <  T_C
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1088/1361-648X/add63d
UR  - https://bib-pubdb1.desy.de/record/641749
ER  -