%0 Journal Article
%A Singha, A. D.
%A Seehra, M. S.
%A Skoulatos, M.
%A Sarkar, T.
%A Pramanik, P.
%A Chowdhury, Sourav
%A Hoesch, M.
%A Reehuis, M.
%A Többens, D. M.
%A Raghu, A.
%A Kaushik, S. D.
%A Thota, Subhash
%T 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> 
%J Journal of physics / Condensed matter
%V 37
%N 22
%@ 0953-8984
%C Bristol
%I IOP Publ.
%M PUBDB-2025-05160
%P 225802
%D 2025
%Z Waiting for fulltext 
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1088/1361-648X/add63d
%U https://bib-pubdb1.desy.de/record/641749