Journal of Magnetism and Magnetic Materials最新文献

{"title":"Magnetic phase transitions and magnetocaloric effect in Ho2Co17: A mean-field with Magneto-Voulme coupling study","authors":"Rana M. Elkhneny ,&nbsp;Mohammed Said Mohammed Abu-Elmagd ,&nbsp;Samy H. Aly ,&nbsp;Sherif Yehia ,&nbsp;Fatema Z. Mohammad","doi":"10.1016/j.jmmm.2025.173206","DOIUrl":"10.1016/j.jmmm.2025.173206","url":null,"abstract":"<div><div>In this work, we present a theoretical study on the magnetic, magnetocaloric properties and the nature of phase transitions in Ho₂Co₁₇ compound. We have used the mean- field Bean- Rodbell model, with taking into account the magneto-volume coupling, in our calculation. The temperature and magnetic field-dependences of the magnetization, heat capacity, entropy, isothermal change in entropy ΔS_m, adiabatic temperature change ΔT_ad and the relative cooling powers are reported. An interesting feature of a first-order phase transition (FOPT), around 650 K, followed by a second order (SOPT) one at the Curie temperature is reported. We have used the direct subtraction method, of the entropies at different fields, to calculate of both ΔS_m and ΔT_ad. The maximum ΔS_m values, for a 5 T field change, are around 5.98 J/mol. K and 0.15 J/mol. K at the FOPT and the SOPT respectively. At the FOPT the adiabatic temperature change is around 8.7 K for a 5 T field change. In order to calculate the adiabatic change in temperature, the electronic and lattice contributions to the total heat capacity must be determined. These two quantities are dependent on the electronic density of states and Debye temperature respectively. For this purpose, we performed calculation on the elastic constants C_ij, elastic moduli, and the electronic density of states (DOS) using the VASP code. For example, the Voigt bulk and shear moduli, and the Debye temperature are found to be 85.518 and 55.23 GPa, and 346.80 K respectively.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173206"},"PeriodicalIF":2.5,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time-variant solute dispersion in a permeable capillary during magnetic drug targeting: Darcy model with drug elimination","authors":"Habtamu Bayissa Yadeta,&nbsp;Sachin Shaw","doi":"10.1016/j.jmmm.2025.173202","DOIUrl":"10.1016/j.jmmm.2025.173202","url":null,"abstract":"<div><div>Solute dispersion plays a critical role in evaluating the efficiency of drug accumulation and release in tumor-targeted therapies, particularly under magnetic drug targeting (MDT), a non-invasive technique where drug-carrying nanoparticles are guided by an external magnetic field. This study investigates shear-induced solute dispersion during magnetically controlled drug delivery through a permeable capillary. Blood flow is modeled as a non-Newtonian Herschel–Bulkley (HB) fluid, comprising a red blood cell-rich core and a plasma-dominated peripheral layer. The surrounding interstitial fluid exerts pressure on the vessel wall, and perfusion through the capillary wall is modeled using Darcy’s law. Drug elimination and source term effects are incorporated into the solute dispersion equation. The flow velocities with both fluid-driven and magnetically induced are solved analytically, while the solute dispersion equation is numerically solved using an implicit backward time–centered space finite difference scheme. The model is compared with other blood rheology, including Bingham, power-law, and Newtonian fluids. Findings reveal that solute dispersion and drug concentration near the tumor site increase with higher magnetic nanoparticle volume fraction, magnetic field strength, Peclet number, vessel permeability, source term strength, carrier particle radius, and fluid yield stress. In contrast, increased tumor–magnet distance and drug elimination reduce capture efficiency. Further, the Herschel–Bulkley fluid shows superior drug-targeting performance compared to Bingham, power-law, and Newtonian models. This research provides valuable insights into the interplay between physiological and physical parameters affecting drug delivery and offers a robust framework for enhancing the efficacy of magnetic drug targeting cancer treatment applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173202"},"PeriodicalIF":2.5,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A combination model of vehicles’ motion magnetic field","authors":"Lu Yin ,&nbsp;Xiaoyan Zhao ,&nbsp;Tianyao Zhang ,&nbsp;Jianmei Guo ,&nbsp;Fan Song ,&nbsp;Chunlei Li ,&nbsp;Lei Han ,&nbsp;Liang Liang ,&nbsp;Zhaohui Zhang","doi":"10.1016/j.jmmm.2025.173205","DOIUrl":"10.1016/j.jmmm.2025.173205","url":null,"abstract":"<div><div>A novel combination model is proposed for the magnetic field generated by the complex structure of the vehicle, which consists of magnetic dipoles and magnetized cubes. Simulation experiments conducted on this model, in conjunction with measurements obtained using a SQUID gradiometer, validate its effectiveness. The results demonstrate a strong correlation between the simulation and experimental curves, thereby affirming the model’s applicability for precision detection of complex vehicles in non-line-of-sight scenarios.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173205"},"PeriodicalIF":2.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailoring exchange coupling at MgO/(FeCoNi)86Al7Ti7 interfaces for concurrent soft magnetic enhancement and GHz-Range electromagnetic dissipation","authors":"Hongyu Ding,&nbsp;Yujie Yang,&nbsp;Hao Li,&nbsp;Zhenyu Zhang,&nbsp;Zhihao Geng","doi":"10.1016/j.jmmm.2025.173201","DOIUrl":"10.1016/j.jmmm.2025.173201","url":null,"abstract":"<div><div>In this paper, (FeCoNi)₈₆Al₇Ti₇ high entropy alloys powder is mixed with different concentrations of MgO to prepare high entropy alloys composites. Soft magnetic and wave-absorbing properties of composites characterized and analyzed. The results show that MgO has a role in reducing the total loss of magnetic powder cores. The best soft magnetic performance is obtained when the addition amount is 0.25 wt%, with a total loss of 1455 mW/cm³ (<em>f</em> = 1000 kHz, <em>B_m</em> = 5mT), and the saturation magnetization strength shows a decreasing trend with the increase of MgO content. Significantly improved wave-absorbing performance in the 2–18 GHz band with the addition of MgO. When the added MgO content is 0.25 wt%, the samples have the best wave-absorbing properties. The thickness is 4.5 mm, the minimum reflection loss is −41.2 dB at 7.3 GHz, the effective absorption bandwidth is 3 GHz (5.6–8.6 GHz), and it has excellent wave-absorbing performance.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173201"},"PeriodicalIF":2.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive studying the role of coating on structure, magnetic properties, and heating efficiency for chitosan-coated Co0.2Zn0.8Fe2O4 nanoparticles","authors":"Luu Huu Nguyen ,&nbsp;Nguyen Hoai Nam ,&nbsp;Ta Ngoc Bach ,&nbsp;Tran Thi Ngoc Nha ,&nbsp;Nguyen Thi Minh Hong ,&nbsp;Tuan Dinh Van ,&nbsp;Le The Tam ,&nbsp;Pham Hong Nam","doi":"10.1016/j.jmmm.2025.173200","DOIUrl":"10.1016/j.jmmm.2025.173200","url":null,"abstract":"<div><div>In this work, chitosan-coated Co_0.2Zn_0.8Fe₂O₄ and Co_0.2Zn_0.8Fe₂O₄ nanoparticles (NPs) are successfully synthesized by the co-precipitation method. According to data on lattice parameter (<em>a</em>), density (<em>ρ</em>_XRD), and size (<em>D</em>_HW), the chitosan-coated Co_0.2Zn_0.8Fe₂O₄ (<em>a</em> = 8.396 Å, <em>ρ</em>_XRD = 5.39 g/cm³, <em>D</em>_HW = 11.2 nm) have structural parameters almost like those of Co_0.2Zn_0.8Fe₂O₄ NPs (<em>a</em> = 8.401 Å, <em>ρ</em>_XRD = 5.38 g/cm³, <em>D</em>_HW = 10.7 nm). Besides, the high-resolution Transmission Electron Microscopy images claimed that the Co_0.2Zn_0.8Fe₂O₄ NPs have a medium size of 11.1 nm with a narrow distribution. The successful coating is demonstrated by the Fourier transform infrared spectra of two samples. Although there is a decrease in saturation magnetization from 36.3 emu/g (Co_0.2Zn_0.8Fe₂O₄) to 33.4 emu/g (chitosan-coated Co_0.2Zn_0.8Fe₂O₄), this coated sample (68.8 kJ/m3) have larger magnetic anisotropy than that of Co_0.2Zn_0.8Fe₂O₄ NPs (61.4 kJ/m3). The chitosan coating improves the dispersion of the chitosan-coated Co_0.2Zn_0.8Fe₂O₄ NPs in an aqueous and helps them into non-toxicity against the liver (HepG2) and breast (MCF7) cancer cell lines. Interestingly, it also enhances their hydrodynamic size (161.2 nm), which leads to the domination of Neel relaxation losses in the chitosan-coated Co_0.2Zn_0.8Fe₂O₄ NPs’ heating generation mechanism. As a result, this coated sample have a high specific absorption rate (291.1 W/g) at 300 Oe (∼2.4 kA/m) and 340 kHz. In particular, this also has a high effective specific absorption rate (1.5–2.6 nHm²/kg) at 150–300 Oe and 340 kHz. All these reveal the CZFO@CS NPs’ high applicability in hyperthermia.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173200"},"PeriodicalIF":2.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic properties dependence on stacking configurations of a trilayer graphene bond-diluted Ising model","authors":"M. Mouhib ,&nbsp;A. EL Fadl ,&nbsp;S. Bri ,&nbsp;M.D. Belrhiti ,&nbsp;H. Mounir","doi":"10.1016/j.jmmm.2025.173199","DOIUrl":"10.1016/j.jmmm.2025.173199","url":null,"abstract":"<div><div>This work aims to conduct a comparative analysis of the phase diagrams and the magnetizations of diverse stacking configurations in trilayer graphenes (TLGs) as described in a bond-diluted Ising model, within the finite cluster approximation (FCA). When the middle layer is occupied by mixed spin-1/2 and spin-1, the outer layers consist of spin-1/2 atoms interconnected ferromagnetically via a diluted bond J₁. In the pure case (p = 1), all transition temperatures T_c are of second-order; meanwhile enhancing dilution through reducing the concentration p results in a decrement of T_c. At a low-temperature regime, for the AAA- and ABA-stacked (TLGs), all T_c-lines coincide at p = 0 to a non-zero minimum value, with a horizontal reentrance observed specifically for the ABA-stacked case. In the case of the ABC-stacked (TLG), we identify according to J₁ strength, a vertical or double vertical reentrances succeeded by vanishment of the ferromagnetic order at a critical bond percolation threshold p_c. The inclusion of the crystal fields D_s plays a relevant role in the appearance of the tricritical behavior exclusively for the AAA and ABA stackings.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173199"},"PeriodicalIF":2.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Approach of a digital twin for the high-frequency dynamics (FMR) of arbitrarily shaped, symmetric ferromagnetic polycrystalline samples","authors":"K. Seemann","doi":"10.1016/j.jmmm.2025.173189","DOIUrl":"10.1016/j.jmmm.2025.173189","url":null,"abstract":"<div><div>Soft polycrystalline ferro- or ferrimagnetic materials of arbitrary but symmetrical shape, which form their static magnetisation behaviour according to the demagnetisation Tensor <strong>N</strong>, were theoretically described in terms of their high-frequency dynamics and precession damping of the magnetic moments on the dependence of their microstructure, i.e., the grain size in association with the magneto-crystalline anisotropy. As the basic equation the Landau-Lifschitz-Gilbert (LLG) differential equation was used, in order to establish a general solution which expresses the frequency-dependent magnetisation, magnetic susceptibility χ(f) and permeability μ(f) spectra. By means of two examples, films and spherules, we present the dynamics when exposed to a high-frequency wave by taking parameters like the resistivity ρ_m, magneto-crystalline coefficient K₁, uniaxial anisotropy H_u, grain size D_grain, thickness t_m, diameter d and eddy-current generation into account. Damping of the magnetic spins is conspicuous by regarding the full width at half maximum (FWHM) of the frequency-dependent imaginary part of the permeability, and in this connection, the effective damping parameter α_eff which represents intrinsic as well as extrinsic damping mechanisms. In the papeŕs context, the latter are caused by grains of various size and generate energy dissipating two-magnon scattering.</div><div>The goal is to make a first step of an approach for a digital twin which ought to allow the prediction of the dynamic behaviour of ferromagnetic components. They are employed in r.f. devices like cores in (micro) inductors, memory storage devices, etc. or used for basic magnetisation dynamics research. The calculations were conducted by availing the mathematical program MAPLE. Various shapes and parameters now enable to conceive a variety of r.f. components and their very properties.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173189"},"PeriodicalIF":2.5,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Color center defects on modulating magnetic, optical, and catalytic behavior of zinc ferrites","authors":"Deepannita Chakraborty ,&nbsp;Priyadharsini N ,&nbsp;Chaitanya Kumar Kunapalli","doi":"10.1016/j.jmmm.2025.173183","DOIUrl":"10.1016/j.jmmm.2025.173183","url":null,"abstract":"<div><div>The impact of color center defects on the optical, magnetic, and catalytic properties of lemon peel extract as reducing agent and synthesized pure and doped zinc ferrite nanoparticles via co-precipitation method. The structural characteristics from X-ray diffraction report single phase cubic spinel structure of pure and doped zinc ferrite nanoparticles. The diffuse reflectance spectroscopy reveals a bandgap reduction from 4.79 to 3.34 eV due to the formation of color centers. Additionally, the decrease in the intensity of the photoluminescence spectra upon doping supports the presence of color centers. Doping with magnesium (alkaline earth metal) and aluminium (post transition metal) induced F and F⁺ center defects, while the co-doping generates M center defects, influencing photocatalytic performance. The MB dye degradation efficiencies for Mg-doped, Al-doped, and co-doped ZnFe₂O₄ were 80 %, 83 %, and 75 %, respectively, within 120 min under sunlight. Furthermore, Al-doped ZnFe₂O₄ demonstrated high catalytic stability, retaining 81.4 % degradation efficiency even after seven cycles. The magnetic properties of doped ferrites vary based on the presence of these color centers. This study highlights the synergistic effect of metal doping on bandgap tuning, photocatalytic efficiency, and long-term catalytic stability, offering insights into defect engineering for enhanced environmental remediation.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173183"},"PeriodicalIF":2.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large topological Hall effect in Ti-doped Mn2-xTixSb (0 < x ≤ 0.2) ferrimagnets","authors":"Zhipeng Deng ,&nbsp;Hanxiao Chen ,&nbsp;Wei Li ,&nbsp;Ruiqi Wang ,&nbsp;Xiaohua Luo ,&nbsp;Changcai Chen ,&nbsp;Chunsheng Fang ,&nbsp;Shengcan Ma","doi":"10.1016/j.jmmm.2025.173185","DOIUrl":"10.1016/j.jmmm.2025.173185","url":null,"abstract":"<div><div>Very recently, large and novel topological Hall effect (THE) has been reported near spin reorientation transition (SRT) in Mn₂Sb-based ferrimagnets, which are in general believed as a category of multiple magnetic functional materials. In this work, the structure, microstructure, and electrical transport properties are investigated in Ti-doped Mn_2-<em>_x</em>Ti<em>_x</em>Sb (0 &lt; <em>x</em> ≤ 0.2) polycrystalline alloys. Firstly, it is amazing to find that the inevitable MnSb impurity takes on many nearly straight, long and narrow bands, which wraps around the perimeter of Mn₂Sb main phase. With increasing Ti-substitution, the MnSb impurity is becoming less and less. For all the samples, secondly, the antiferromagnetic (AFM) state and accordingly the first-order AFM-ferrimagnetic (FIM) transition is not discovered. Evidently, nevertheless, the spin reorientation transition (SRT) temperature <em>T</em>_SR declines. What is more important, a large positive topological Hall resistivity (<span><math><mrow><msubsup><mi>ρ</mi><mrow><mi>xy</mi></mrow><mi>T</mi></msubsup></mrow></math></span>) ∼0.84 μΩ cm is gained at 1.8 mT and 260 K in Mn_1.88Ti_0.12Sb alloy. At the same time, a sign switching of <span><math><mrow><msubsup><mi>ρ</mi><mrow><mi>xy</mi></mrow><mi>T</mi></msubsup></mrow></math></span> is strikingly observed before and after the SRT. With ascending Ti-content from 0.12 to 0.20, furthermore, it is found that the positive value of <span><math><mrow><msubsup><mi>ρ</mi><mrow><mi>xy</mi></mrow><mi>T</mi></msubsup></mrow></math></span> increases firstly and then diminishes around SRT. The physical mechanism behind these phenomena is discussed in polycrystalline Mn_2-<em>_x</em>Ti<em>_x</em>Sb (0 &lt; <em>x</em> ≤ 0.2) alloys.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173185"},"PeriodicalIF":2.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photocatalytic activity of green synthesized canted ferromagnetic hematite iron oxide nanoparticles for methyl orange removal in wastewater remediation","authors":"Biplab Kumar Mandal ,&nbsp;Pratap Singh Chauhan ,&nbsp;Rahul Das","doi":"10.1016/j.jmmm.2025.173182","DOIUrl":"10.1016/j.jmmm.2025.173182","url":null,"abstract":"<div><div>In this study, iron oxide nanoparticles (NPs) were synthesized in an environmentally friendly manner utilizing FeCl₃ as the precursor salt in the presence of <em>Nyctanthes arbor-tristis</em> L. leaf extract. The sizes of these NPs were estimated using electron microscopy to be between 18 nm and 66 nm. The images of high-resolution transmission electron microscopy (HRTEM) were used to calculate the crystallographic interplanar spacing (<em>d</em>_hkl). The Rietveld refinement of XRD data indicates that synthesized iron oxide nanoparticles belong to the pure hematite (<em>α</em>-Fe₂O₃) rhombohedral lattice symmetry of the <span><math><mi>R</mi><mover><mn>3</mn><mo>¯</mo></mover></math></span>c (167) space group with lattice constants of <em>a</em> = <em>b</em> = 0.49 nm and <em>c</em> = 1.35 nm. Crystallites in this sample have an average size of 40.31 nm. The 2-D and 3-D electron density (ED) maps provided detailed information regarding the distribution of ions. According to magnetic measurements, the produced <em>α</em>-Fe₂O₃ NPs were determined to be canted ferromagnetic with a room temperature coercive force of 129.87 × 10^-4 T and a Morin temperature of 201 K. UV–Vis analysis provided an overall assessment of the band gap (<em>E</em>_g). The photocatalytic activity of these n-type semiconducting (having direct <em>E</em>_g = 2.43 eV and indirect <em>E</em>_g = 1.87 eV) canted ferromagnetic <em>α</em>-Fe₂O₃ NPs was examined for the degradation of methyl orange (MO) dyes. The results demonstrated substantial catalytic activity towards MO degradation in the presence of a small amount of H₂O₂, suggesting their potential application in wastewater treatment.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"628 ","pages":"Article 173182"},"PeriodicalIF":2.5,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}