guest ::
| Home > Publications database > Anisotropy driven spin–reorientation, and two–step magnetic ordering in cubic semiconducting spinel Cr$_{0.1}$Mn$_{0.9}$Fe$_{0.2}$Co$_{1.8}$O$_4$ |
| Home > Publications database > Anisotropy driven spin–reorientation, and two–step magnetic ordering in cubic semiconducting spinel Cr$_{0.1}$Mn$_{0.9}$Fe$_{0.2}$Co$_{1.8}$O$_4$ |
| Journal Article | PUBDB-2025-05160 |
; ; ; ; ; ; ; ; ; ; ;
2025
IOP Publ.
Bristol
This record in other databases: 
Please use a persistent id in citations: doi:10.1088/1361-648X/add63d
Abstract: The nature of magnetism in the cubic spinel Cr$_{0.1}%$Mn$_{0.9}$Fe$_{0.2}$Co$_{1.8}$O$_4$ 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$_C$ produces weakly interacting magneticclusters in this magnetic semiconductor with bandgap ∼0.57 eV.
; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)