Nano Ferrites Research Articles

Pr3+-doped Cu–Co nano ferrites: study on its microstructure, morphology, and magnetic properties

Pr3+-doped Cu–Co nano ferrites: study on its microstructure, morphology, and magnetic properties

Studying the structural properties of Mg-Zn ferrite nano partical prepared by auto combustion Sol-gel method

In the present work the Magnesium-zinc ferrite chain ( Mg1-xZnxFe2O4) with x=0-1,were synthesized using sol-gel auto combustion as a modern chemical ‎methods .Nitrates, citric acid and ammonia were used ‎in order to get ferrite nano powders at temperature 2200C , which characterized a higher dispersion ‎and homogeneity with particle size in the range of (27.47-68.9) nm. The obtained ferrite nano powder calcined at temperature 5000C for a period three hours .
 Samples examined by Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). From FTIR spectral analysis the structure of the spinel ferrites shows two absorption bands, , due to vibration of octahedral and tetrahedral metal oxygen bonds. SEM results show the presence of uniformly distributed and almost spherical shaped particles

Synthesis and Magnetic Properties of the Ceramic Nano Ferrite MnFe2-xSmxO4

يتم تحضير سلسلة السيراميك النانوي الفريت من الصيغة MnFe2-xSmxO4 (x = 0 ، 0.5 ، و 0.1) ، باستخدام عملية احتراق الحل. أظهر تحليل XRD أنماطًا سيئة حلًا للمساحيق المحترقة والتي يتم إصلاحها تدريجيًا عن طريق الرفع التدريجي لدرجة حرارة المعالجة الحرارية. أشار تحليل حجم جزيئات EM إلى أن أبعاد المسحوق المحترق هي من الترتيب النانوي. علاوة على ذلك ، أظهر التحليل الحراري لهذه المساحيق انخفاضًا مستمرًا في منحنى TG في نطاق درجة حرارة يصل إلى 1000 درجة مئوية. نفس النطاق. أكدت قياسات مغناطيسية درجة حرارة الغرفة للمساحيق الخضراء المضغوطة أو الملبدة ذات التركيبات المختلفة الطبيعة المغناطيسية الفائقة للفريتات النانوية. ومع ذلك ، لوحظت تعديلات في حلقات التخلفية عندما تتعرض مساحيق الفريت المختلفة لمخططات المعالجة الحرارية المذكورة أعلاه. قد يُعزى ذلك إلى الاختلافات في الترتيب الذري (انعكاس بنية الإسبينيل) ، كما أن الاستبدال الجزئي لأيونات الحديد بواسطة أيونات Sm-أيونات الأرض النادرة قد يؤدي إلى سلالات محلية أو شوائب أو عيوب شبكية قد تسبب أيضًا مثل هذه التعديلات. من ناحية أخرى ، يتم تغيير قيم المعلمات المغناطيسية مثل النفاذية والمغناطيسية المتبقية بشكل صريح عند استبدال أيون الحديد أو المعالجات الحرارية.

Synthesis and characterization of Tb doped Ni–Zn nano ferrites as substrate material for dual band MIMO antenna

Recently, ferrite materials with outstanding characteristics, like reflection and absorption ability, lightweight, and thinness in size, are essential to resolve electromagnetic interference challenges. In the present work, Terbium doped Nickel-Zink nano-ferrite material with a composition of Ni0.5Zn0.5Tb0.02Fe1.98O4 was prepared and used as a substrate in a dual-band yagi-Uda-shaped 4×4 multi input multi output antenna. X-ray diffraction (XRD) measurements confirmed the cubic spinel ferrite sample. A vibrating sample magnetometer and Field Emission Scanning Electron Microscope analysis are also performed to evaluate its magnetic and morphological properties. Dielectric constant (εr) and permeability (μr) are determined using a vector network analyzer. The Multi Input Multi Output (MIMO) antenna operates in dual frequency bands of 3.5 and 5.8 GHz, which is suitable for fifth-generation smartphone applications. The performance of a yagi-Uda-shaped 4×4 MIMO antenna with terbium-doped Nickel-Zink ferrite used as a substrate is explored regarding return loss, radiation efficiency, bandwidth, gain, inter-terminal isolation, envelope correlation coefficient, and Channel Capacity Loss. It is found that the size of the MIMO antenna is reduced with improved bandwidth, isolation, and Channel Capacity Loss performance using a nano-ferrite substrate as compared to those conventional Flame retardant (FR4) substrates.

Luminescence, photocatalytic and dielectric properties of Sm substituted Mg nano ferrites

Sm-substituted spinel nano ferrites of Mg were synthesized through the Citrate Gel Auto Combustion method. The details of fluorescence, photocatalytic activity, and dielectric studies were investigated. Fluorescence spectra reveal that the emission wave length is at 250 to 380 nm in the region under the excitation wavelength of 220 nm. Photocatalytic activity was carried out by methylene blue and acid red under UV–visible irradiation, and degradation rate obtained every 10 min for 50 min. Dielectric parameters like the dielectric constant, loss, AC-conductivity, and impedance analysis have been studied with variations in frequency and temperature. The sample dielectric constant was decreased upon increasing frequency, whereas AC-conductivity increased. This behaviour is explained by the Maxwell-Wagner polarization theory. Single semicircle behaviour was observed in the impedance spectra.

Synthesis and characterizations of nickel doped Co-Zn-Y ferrites

The Nickel substituted Cu-Co-Zn-Ce nano ferrites, Zn0.15Co0.45Cu0.40-xNix Fe1.85Ce0.15O4 with x=0, 0.1, 0.20, 0.30, 0.40, were synthesized using the coprecipitation technique. The sample were sintered at 900 ℃ for 5h. The structural, electrical, dielectric and magnetic properties of all the prepared samples were characterized by XRD, SMU2401, UV-Vis and FTIR. The powder X-ray diffraction patterns of all the prepared samples confirmed the formation of single-phase cubic spinel structures. These samples further characterized for the electrical properties by using two-probe type method. The DC resistivity of all the ferrite composition decreased as the temperature increased, showing their semiconductor nature. UV-Vis and FTIR confirmed the substitution of nickel in Cu-Co-Zn-Ce ferrites. From UV-Vis it is observed that the optical band gap changes from 3.9 eV to 5.3 eV with addition of Ni. FTIR analysis revealed that a strong variation on tetrahedral absorption frequency band is present which is due to the replacement of Ni on Cu. All these results suggested that these materials can be used for wastewater treatment.

Optical, luminescence and photocatalytic activity of Sr based Mg, Ce nano ferrites synthesized by citrate gel auto combustion method

The citrate gel method is used to prepare Sr based Mg, Ce nano ferrites series Sr1-xCexMgyFe2-yO4(where x = y = 0.0, to and 1.0 with 0.25 variation). The prepared samples optical, luminescence, and photocatalytic activity have been carried out. Optical properties carried out by UV–Vis’s spectroscopy and the materials optical band gap energy are calculated by formula 1240/λ, which is found to be 1.68 to 2.23 eV. Luminescence properties are carried out by fluorescence spectroscopy. The fluorescence spectroscopy reveals the broad band that appeared from 285 nm. Photocatalytic activity of the synthesized samples is investigated by two organic azo dyes, namely methylene blue and Acid red under visible light. Pure SrFe2O4 catalyst methylene blue degradation efficiency found to be 39.05%. Whereas 55.48 % degradation efficiency found to be x = 0.5 M concentration. For acid red catalytic activity of the SrFe2O4 found to be 39.5 %. The photo decolourization efficiency of organic dye was enhanced by the doping concentration of Ce and Mg content on Sr nanoferrites.

Structural and dielectric properties of Sr1-xCexMgyFe2-yO4 nano ferrites synthesized by citrate gel auto combustion method

A series of Sr1-xCexMgyFe2-yO4 (where x = y = 0.0, 0.25, 0.50, 0.75, and 1.0) nanoferrites were synthesised via the citrate gel auto combustion method. The synthesised materials structural and electrical properties were examined. Structural properties are investigated by x-ray diffraction analysis (XRD), SEM, and FTIR spectroscopy. X-ray diffraction analysis confirms the cubic spinel structure of the material. The crystalline size of the sample varied from 22 to 32 nm, whereas the lattice parameter was found to be 7.832 to 8.558 Ao. The lattice parameter's linear variation was not observed, which indicates that it does not obey Vegard's law. SEM images reveal those morphological characteristics, which are spherical shapes. EDAX confirms the presence of Sr, Ce, Mg, Fe, and O in the synthesised samples. FTIR spectra confirm the spinel structure with two sublattices, namely, tetrahedral and octahedral sites. Electrical properties carried out by LCR meter at different frequencies and dielectric parameters such as dielectric constant, dielectric loss, AC conductivity, and impedance spectra have been studied. Dielectric constant and loss decreased with increasing frequency, whereas AC conductivity increased. It was explained by the Maxwell-Wagner polarisation theory. A single semicircle type of behaviour was observed in Cole-Cole plots.

Unraveling the structural, electrical Polarization, FTIR, Thermal and electrochemical properties of Dy 3+ substituted ?-ferrites

This research article reveals the effect of Dy +3 substitution on ?-ferrites KFe 11-x Dy x O 17 with composition (x=0.00, 0.25, 0.50, 0.75 and 1.0). The samples were synthesized by sol-gel auto- combustion method, sintered at 950 o C temperature. The XRD patterns confirmed the single phase of the synthesized samples. The crystallite size varied in the range of 21.49 nm to 25.24 nm for all samples. The polarization verses electric field (P-E) loops indicated the loosy behavior in all samples. The lossy behavior of the samples was seemed to be increased up to x=0.5 and then decreased. The theoretical expression was used to fit an upper branch of P-E loops. FT-IR spectra showed absorption bands at different wavenumbers due to M-O-M stretching vibrations, H-O-H stretching, and C-O-C stretching vibrations, which also confirmed the formation of the single-phase in the samples. Electrochemical measurements of synthesized nano ferrites were carried out by using cyclic voltammetry in a 3.0 M KOH solution. Electrochemical impedance spectroscopy (EIS) has been described by Nyquist plots.

Effect of Sm3+ doped Ni-Cd Nano ferrite synthesis and structural characterization by citrate-gel auto combustion method

Ferrite nano particles of basic composition Ni Cd Smx Fe2-xO4(0.0 ≤ x ≤ 0.05, X=0.01) where synthesized by citrate-gel auto combustion method have investigated. X-ray diffraction profile indicates that the samples are in single phase structure for the sample without Sm content. For the samples with Sm ions, some diffraction peaks appeared which belongs to the orthorhombic phase structure further, the XRD have been used calculated the lattice parameter, density and grain size. The particle size of the starting powder composition varied from 30 nm to 45 nm. The values of lattice parameter (a) decreased and X-ray density (dx) increased with the increase of Sm content. Morphology of the prepared samples by citrate-gel method was studied using scanning electron microscope (SEM). The elemental analysis of all the Ni-Cd-Sm ferrite samples with different compositions was analyzed by Energy Dispersive Spectrometer (EDS). The observed results can be explained on the basis of composition and crystal size.

Structural, optical, magnetic and dielectric properties of Ag doped Mg nano ferrites prepared by citrate gel auto combustion method

The Silver Substituted Magnesium ferrites with the formula MgAgXFe2-XO4 (where 0 ≤ x ≤ 0.5 by step 0.1) have been prepared through the citrate gel auto combustion method. Prepared samples structural, morphological, electrical, and magnetic properties have been investigated by XRD analysis, FESEM, AC conductivity, and VSM respectively. XRD and FESEM were used to investigate the structural properties of prepared ferrite materials such as average crystalline size, lattice parameter, X-ray density, unit cell volume, and morphology. Crystalline size was measured to be between 25–30 nm. Five Raman active modes (A1g+Eg+3Tg) were observed in the Raman Spectrum, which are expected in the spinal ferrite system. The prepared sample's structure is confirmed by FTIR spectra bands appearing ∼400 and ∼600 cm−1 wave number region indicates that stretching frequency of tetrahedral (A-site) and octahedral (B-site) respectively. The optical band gap energy of the material observed ranged from 3.44 to 3.51 eV. The variation of dielectric properties has been studied with regard to temperature variation as a function of frequency. All the samples dielectric constant decreases with increasing frequency and temperature, which is the nature of ferrites. It obeys the Maxwell-Wagner type of dispersion because of interfacial polarization. The magnetic properties investigated by room temperature VSM, low coercivity values observed indicate that the sample is of soft magnetic nature.

Dependance of gadolinium ions on structural, magnetic and dielectric properties of manganese nanoferrites

Gadolinium doped manganese nano ferrites (MnGdxFe2-xO4) (X = 0.00, 0.02, 0.04, 0.06 and 0.08) for microwave absorbers and storage devices was synthesized by using an effective sol-gel method. The structural parameters analyzed using X-ray diffraction (XRD) revealed a well crystalline cubic phase with crystallite size being smaller in Gd doped nanoferrites. Spherical morphology occurred with lesser agglomeration and because of the dopant driven synergistic effect influence the bandgap. The magnetic hysteresis curves demonstrated soft ferromagnetic nature with increasing coercivity (Oe) and decreasing saturation (Ms). Gd co-doping altered the grain and grain boundaries resistance of nano ferrites and better dielectric characteristics were formed with increasing Gd3+ concentration as AC frequency increased (voltage). The result shows the lowest dielectric loss of 1.8542 with the highest dielectric constant of about 1574426.14 for manganese nano ferrites influenced by Gd3+ion.

Nano Ca–Mg–Zn ferrites as tuneable photocatalyst for UV light-induced degradation of rhodamine B dye and antimicrobial behavior for water purification

We report the synthesis of Ca-doped Mg–Zn ferrite Mg0.4Zn(0.6-x)CaxFe2O4 nanomaterials with x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6 through citrate precursor approach and their structural, morphological, optical, photocatalytic, and antimicrobial properties were systematically studied. The prepared nanoferrites's cubic spinel structure with an average crystallite size of 15–38 nm was evaluated by the XRD examination. The spherical morphology of these ferrite nanoparticles was seen from scanning electron microscopy (SEM). The observed bands at 560 cm−1 and 406 cm−1 in the FTIR spectra confirmed the spinel structure of the synthesized nanoferrite. The optical study confirmed an optical band gap of 1.60 eV–1.86 eV. The photocatalysis was done for the degradation of rhodamine B dye solution under UV light. All the synthesized nano ferrites displayed a promising antimicrobial potential upon Candida albicans fungi. Mg0.4Zn0.1Ca0.5Fe2O4 nanoparticles have a better photocatalytic response (99.5%) for the degradation of rhodamine B dye and show superior antimicrobial activity (96.1%) for the inhibition of Candida albicans fungi.

A metal substituted nano ferrite (M = Zn, Cu, Fe and mn; x = 0 and 0.5)] improved Screen-Printed electrode for anodic determination of Toldimfos sodium

A novel metal substituted nano ferrite (M = Zn, Cu, Fe and Mn; x = 0 and 0.5)] modified screen-printed electrode (GSPE) was manufactured for Toldimfos sodium (TDS) discovery in raw material, pharmaceutical formula and human plasma by means of square wave voltammetry (SWV). Anodic square wave voltammetric peaks have been performed at the optimal circumstances of the drug solution like nanoparticle type, pH and, scan rate. These tested nanoparticles were coated on ferrite screen printed electrode (GSPE) providing a novel sensor to sense the TDS in the range of 19.98 to 334.70 ng/ml. They were verified for their electroactivity in refining electrodes sensitivity and detection limit. The morphology of the tested electrodes has been imaged by means of scanning electron microscope (SEM). The Cu NPs was found to have the highest electrocatalytic activity and all this work has been accomplished on Cu NPs modified electrode. It gives LOD of 3.12 ng/ml and LOQ of 9.47 ng/ml in the studied range for TDS. This advanced electrode has been utilized for the TDS analysis in raw materials, pharmaceutical formulation and spiked serum.

Study of structural, optical, photocatalytic, electromagnetic, and biological properties Co0.75Mg0.25CexFe2−xO4 of Mg-Co nano ferrites

Nano spinel ferrites with formula Co0.75Mg0.25CexFe2−xO4 (0 ≤ x ≤ 0.25 by step 0.05) were synthesized by using citrate gel auto combustion method and studied their structural characterization, optical studies, photocatalytic, biological and electromagnetic properties. Structural properties carried out by XRD, SEM, EDS, FTIR spectroscopy. The XRD studies confirm the crystalline size & lattice constant of Ce co-doped Co-Mg mixed nano ferrites. Morphology of the samples were examined by SEM and EDS analysis confirmed the proposed sample composition. FTIR spectral analysis help to confirm the formation of spinel structure in ferrite samples. Further optical studies confirm the band gap energy and cut off wavelength. Photocatalytic degradation of MB and AR dyes were carried out and good results were observed the degradation activity due to the catalyst heat treatment. Antibacterial studies confirmed that the nanoparticles are toxic to Bacillus subtilis, staphylococcus aureus (gram-positive strains) and Escherichia coli, Klebsiella pneumonia (gram-negative strains) Bacillus subtilis showed highest zone of inhibition of 13.3 mm. Saturation magnetization, coercivity, and remanence magnetization were calculated by VSM and Co0.75Mg0.25Ce0.25Fe1.75O4 was found to have high saturation magnetization that indicates that the sample behaves like a super para magnet. The Squareness of Co-Mg-Ce mixed nano ferrites initially decreases than increases hence the system changes from soft ferrites to hard ferrites. The electromagnetic properties such as AC conductivity (σAC), Dielectric constant (ε/), and impedance analysis are reported. The cole–cole plots shows the single semicircle behaviour.

Study of the suitability of manganese-substituted cobalt ferrites nanoparticles as MRI contrast agent and treatment by employing hyperthermia temperature

Ferrite-based nanoparticles have initiated a new era in biomedical field of research. Researchers synthesized novel materials that can be applied in the biomedical field specially for tumor detection and treatment. Co1−xMnxFe2O4 (x = 0.2, 0.4, 0.6, and 0.8) nano ferrites have been prepared by wet chemical co-precipitation method and coated by biocompatible material chitosan. Then the structure of the bare nanoferrite materials was confirmed by the XRD analysis that found that the material possesses a face-centered cubic (fcc) structure. The value of the experimental lattice constant was determined by analyzing the XRD data. For coated samples, Surface morphology was investigated by FESEM, both bright and dark TEM images, HRTEM and SAED images. The characteristic rings of the SAED pattern also define the fcc structure of the material which shows good agreement with XRD data. The calculated grain size found from the histogram of CoFe2O4 showed good agreement with the crystal size of the corresponding material. The proportions of the elements of bare and coated nanoferrites have been revealed by the EDS study. The successful coating was confirmed by FTIR spectra. Magnetic characterization of coated material was investigated by VSM. It has been seen that the sample Co0.8Mn0.2Fe2O4 showed the highest saturation magnetization and magnetic moment. For tumor treatments, the experimental value of hydrodynamic diameter and polydispersity index (PDI) of all the coated samples was within the permissible limit. Hyperthermia temperatures of the ferrite samples were calculated. From the time dependence temperature graph, using the sharp slope, the Specific Loss Power (SLP) value was also determined. By contrasting all the cytotoxicity data applied to the Hela cell line, cell viability has been observed at 95%. The values of Relaxivity were estimated from MRI images. With the rise of manganese ions, the value of relaxivities progressively decreased. Moreover, in-vivo angiography of the Albino Wistar rat was observed. Though chitosan-coatedferritesare not brain or muscle-specific, it has been observed that the contrast is enhanced for the images with agents than without agents. It is further observed that the contrast enhancement is the best with the contrast agent Co0.8Mn0.2Fe2O4.

The influence of aluminum’s crystalline structure on the elastic, dielectric, and electrical properties of Ni ferrite

The authors investigate the effect of Al on the structural, elastic, and electrical properties of a Ni nano ferrite. Six samples of NiAl x Fe 2−x O 4 (where x = 0.00, 0.20, 0.40, 0.60, 0.80, and 1.00) were synthesized using flash auto combustion. As shown in XRD patterns, the lattice appears as a Fd-3m space group, a single-phase spinel structure with average crystallite size ranging from 22.4–24.7 nm for all samples. SEM and TEM images showed a uniform and spherical structural with a narrow size distribution. The results manifest significant changes in the elastic and electrical properties due to the presence of Al. As Al content increased, the bulk B, shear G, and Young E moduli decreased and remained in the same order of hundreds in the GPa range: however, the values of the Debye temperature θ D increased. The dielectric parameters ε′, ε″, and tan δ decreased as the frequency of the applied field and Al content increased: they also decreased as temperature increased. The relaxation times were for all samples. The electric moduli M′ and M″ increased as the frequency of the applied field and Al content increased, but they decreased as temperature increased. The relaxation times are dispersed depending on Al content, frequency, and temperature. The Cole-Cole curve showed two semicircles corresponding to the grain and grain boundary with the electrical relaxation of the non-Debye form. The electric impedance Z′ and Z″ increased as the frequency of the applied field and temperature increased, although they decreased as Al content increased. These results indicate that Ni-Al ferrite has respectable dielectric properties, which opens the door for many applications in control and safety monitoring tools, where dynamic process temperature sensors are of great importance and the temperature dependency of the material is significant.

Synthesis and Characterization of Magnetic (Co-Ni-Fe2O4) Nano Ferrite for Biomedical Application

Synthesis and Characterization of Magnetic (Co-Ni-Fe2O4) Nano Ferrite for Biomedical Application

Synthesis and characterization of thermally treated Co1-xFe2+xO4 (x = 0.0 –0.8) spinel nano ferrite

We report the effect of surplus-Fe-content, and thermal annealing on the properties of sol gel auto-combustion synthesized Co1–xFe2+xO4 (x = 0.0–0.8) spinel ferrites. X-ray diffraction (XRD), magnetic measurements, Fourier transform infrared (FTIR) spectroscopy, Ultraviolet–visible (UV–Vis) are used to monitor the effect of excess Fe-content, and thermal annealing dependence of properties, and correlation among them. XRD validates presence of spinel nanoferrite (31.54 – 44.89 nm) phase, minor presence of α-Fe2O3 phase was also detected. Results reveal that variation of Fe-content leads to: i) variation of lattice-parameter, re-distribution of Fe3+. Co2+ ions on A, B-site, ii) alteration of inversion degree, disorder, iii) modification of saturation magnetization due to spin disorder at surface, iv) variation of coercivity, and related grain size imply that studied ferrites are in single-multi domain overlap regions, while squareness-ratio indicates variation of inter-grain interaction, isotropic behaviour of multi-domain particles; iv) fine-tuning of bandgap (1.35 – 1.5 eV) via changes in cationic-distribution and lattice-parameter, v) variation of Debye temperature, suggests modification of lattice vibrations. Current work implies strong correlation between bandgap magnetic, structural properties.

Dysprosium doped Cu0.8Cd0.2DyxFe2-xO4 nano ferrites: A combined impact of Dy3+ on enhanced physical, optical, magnetic, and DC-electrical properties

The current study focuses on the influence of rare-earth Dy3+ ion substitution on the structural, optical, electrical, and magnetic properties of Cu0.8Cd0.2Fe2O4 nano-ferrites. A series of Dy3+ doped Cu–Cd nano-ferrites with the chemical composition of Cu0.8Cd0.2DyxFe2-xO4 (x = 0.00, 0.025, 0.05, 0.075, and 0.10) were fabricated by CSGAC (citrate sol-gel auto combustion) technique using the corresponding elements in nitrate state and grounded powders were calcined at 650 °C for 4 h. These ferrite nanoparticles (NPs) structural, optical, magnetic, and electrical properties were investigated using P-XRD, FE-SEM, HR-TEM, FTIR, UV–Vis, ESR, VSM, and I–V measurements. The purity of the crystal structure, phase formation, and the various structural parameters of Cu–Cd-Dy nanoparticles have been analyzed from P-XRD data. The evaluated crystalline size ranges between 13.82 and 18.32 nm, and the lattice constant is between 8.349 and 8.385 Å. We observed the particles-size of 40–60 nm from HR-TEM and the grain size of 48–80 nm from FE-SEM images. The observed FTIR spectra demonstrated the spinel structure in the presence of the stretching bonds of metal-oxides and functional groups. The semiconducting character of the produced NPs is confirmed by the optical bandgap, which is in the range of 1.62 eV–1.73 eV. The g-value obtained from the electron spin resonance (ESR) spectroscopy is in the range of 2.613-2.333. The coercivity (Hc) reduced from 557.29-183.89 Oe at 300 K and 749.85-410.72 Oe at 15 K, respectively, with Dy3+ concentration. The maximum saturation magnetization obtained at 300 K temperature for x = 0.025 is 32.53 emu/g, whereas at 15 K for x = 0.1 is 38.85 emu/g. The results of the present examined samples with improved Hc, Ms, and Mr values at low temperature (15 K) than room temperature (300 K) revealed that Dy3+ doped Cu0.8Cd0.2Fe2O4 nanoparticles are helpful for high-density recording media application. By increasing the Dy3+ addition, the resistivity values were observed to increase from 9.107×106 to 1.166×108 Ω-cm.