A D Singha, M S Seehra, M Skoulatos, T Sarkar, P Pramanik, S Chowdhury, M Hoesch, M Reehuis, D M Többens, A Raghu, S D Kaushik, S Thota
{"title":"Anisotropy driven spin-reorientation, and two-step magnetic ordering in cubic semiconducting spinelCr0.1Mn0.9Fe0.2Co1.8O4.","authors":"A D Singha, M S Seehra, M Skoulatos, T Sarkar, P Pramanik, S Chowdhury, M Hoesch, M Reehuis, D M Többens, A Raghu, S D Kaushik, S Thota","doi":"10.1088/1361-648X/add63d","DOIUrl":null,"url":null,"abstract":"<p><p>The nature of magnetism in the cubic spinelCr0.1Mn0.9Fe0.2Co1.8O4is reported based on systematic investigations by means of magnetization (<i>M</i>), ac susceptibility (<i>χ</i>) and heat capacity (CP) measurements, as well as by neutron diffraction. Structural characterization of the sample was done using<i>x</i>-ray absorption spectroscopy, neutron and synchrotron diffraction. The<i>M</i>vs.<i>T</i>variation in different magnetic fields indicate ferrimagnetic ordering belowTC= 230 K, followed by a magnetic field and anisotropy induced spin reorientation at<i>T</i><sub>SR</sub>∼150 K. With increasing<i>T</i>starting from 2 K, the coercivityHCand anisotropy field<i>H<sub>K</sub></i>decrease and become negligible forT>TSR. A model to explain theHCvs.<i>T</i>data shows that<i>T</i><sub>SR</sub>is due to reorientation of<i>M</i>along<i>H</i>whenH>HK. TheCPvs.<i>T</i>data shows a weak<i>λ</i>-type anomaly atTCwith changes in magnetic entropy smaller than those observed below<i>T</i><sub>SR</sub>suggesting that long-range magnetic ordering is completed below<i>T</i><sub>SR</sub>. ForTSR<T<TC, the presence of weakly interacting magnetic clusters having weak short-range interactions is evident based on analysis of magnetization and ac susceptibilities. Exchange constants (<i>J</i><sub><i>AA</i></sub>/kB= 7.9 K,<i>J</i><sub><i>AB</i></sub>/kB= 22.6 K and<i>J</i><sub><i>BB</i></sub>/kB= -5.3 K) are determined from the temperature dependence of paramagnetic susceptibility for<i>T</i>>TC. This analysis also shows the low-spin<i>S</i>= 0 state of Co<sup>3+</sup>ions on the<i>B</i>sites which along with negligible<i>H<sub>K</sub></i>forTSR<T<TCproduces weakly interacting magnetic clusters in this magnetic semiconductor with bandgap ∼0.57 eV.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics: Condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1088/1361-648X/add63d","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
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Abstract
The nature of magnetism in the cubic spinelCr0.1Mn0.9Fe0.2Co1.8O4is reported based on systematic investigations by means of magnetization (M), ac susceptibility (χ) and heat capacity (CP) measurements, as well as by neutron diffraction. Structural characterization of the sample was done usingx-ray absorption spectroscopy, neutron and synchrotron diffraction. TheMvs.Tvariation in different magnetic fields indicate ferrimagnetic ordering belowTC= 230 K, followed by a magnetic field and anisotropy induced spin reorientation atTSR∼150 K. With increasingTstarting from 2 K, the coercivityHCand anisotropy fieldHKdecrease and become negligible forT>TSR. A model to explain theHCvs.Tdata shows thatTSRis due to reorientation ofMalongHwhenH>HK. TheCPvs.Tdata shows a weakλ-type anomaly atTCwith changes in magnetic entropy smaller than those observed belowTSRsuggesting that long-range magnetic ordering is completed belowTSR. ForTSRJAA/kB= 7.9 K,JAB/kB= 22.6 K andJBB/kB= -5.3 K) are determined from the temperature dependence of paramagnetic susceptibility forT>TC. This analysis also shows the low-spinS= 0 state of Co3+ions on theBsites which along with negligibleHKforTSR
期刊介绍：
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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