Role of lattice structure and breaking of antiferromagnetic spin order in enhancement of ferromagnetic, electronic, and magneto-electric properties in Fe2-xScxO3 system

IF 3.2 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry Pub Date : 2026-05-01 Epub Date: 2026-01-23 DOI:10.1016/j.jssc.2026.125842

R.N. Bhowmik , Bipin Kumar Parida , Amit Kumar , P.D. Babu , S.M. Yusuf

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Abstract

The strategy of breaking antiferromagnetic (AFM) ground state in α-Fe₂O₃ by doping non-magnetic Sc³⁺ (3 d⁰) ions at the Fe³⁺ (3 d⁵) sites has been used in Fe_2-xSc_xO₃ system (x = 0.2–1.0). The material has been stabilized in single-phase (rhombohedral α-Fe₂O₃) or mix-phase (rhombohedral α-Fe₂O₃ and cubic Sc₂O₃-types) structure by varying Sc content and heat treatment temperature. Neutron diffraction confirmed perturbed AFM ground state down to low temperature with magnetic moment ∼ 2.75–4.68 μB/Fe site and Morin transition ∼ 260 K. DC magnetic measurement showed magnetic coercivity 0.2 to 6 kOe. The material showed transformation from insulating state (conductivity 10⁻¹⁴-10⁻¹⁰ S/cm and polarization 0.5–2 μC/cm²) to high conductive state (conductivity ∼ 10⁻¹⁰ -10⁻⁷ S/cm and polarization >2 μC/cm²) above the Morin transition. The room temperature measurements showed maximum current density 35–186 μA/cm², electric polarization 2.7–15.6 μC/cm², magneto-electric voltage up to 5 mV with coupling constant α_ME ∼0.62–10.11 mV/Oe.cm and magneto-conductance up to 90 %. The results will open the door for suitably modifying the lattice-structure, magnetic spin order, and charge-spin coupling in hematite based material and their application in low power spintronic devices.

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晶格结构和反铁磁自旋顺序的破坏对Fe2-xScxO3体系铁磁、电子和磁电性能增强的作用

在Fe2-xScxO3体系（x = 0.2-1.0）中，采用在Fe3+ (3d5)位点掺杂非磁性Sc3+ (3d0)离子打破α-Fe2O3中反铁磁（AFM）基态的策略。通过改变Sc含量和热处理温度，材料稳定为单相（菱形α-Fe2O3）或混合相（菱形α-Fe2O3和立方sc2o3型）结构。中子衍射证实了扰动AFM基态低至低温，磁矩为~ 2.75 ~ 4.68 μB/Fe位，Morin跃迁为~ 260 K。直流电磁测量显示矫顽力为0.2 ~ 6koe。在Morin跃迁过程中，材料从绝缘状态（电导率10−14-10−10 S/cm，极化0.5-2 μC/cm2）转变为高导电状态（电导率~ 10−10 -10−7 S/cm，极化>；2 μC/cm2）。室温测量结果表明，最大电流密度35 ~ 186 μA/cm2，电极化2.7 ~ 15.6 μC/cm2，磁电电压高达5 mV，耦合常数αME ~ 0.62 ~ 10.11 mV/Oe。厘米和磁导率高达90%。研究结果将为适当修改赤铁矿基材料的晶格结构、磁自旋顺序和电荷自旋耦合及其在低功率自旋电子器件中的应用打开大门。

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来源期刊

Journal of Solid State Chemistry 化学-无机化学与核化学

CiteScore

6.00

自引率

9.10%

发文量

848

审稿时长

25 days

期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.