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Magnetic Functional Materials: Synthesis, Characterization and Application - 2nd Volume

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 8362

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Dr. Haiou Wang

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Guest Editor

Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, China
Interests: magnetic materials; spintronics; thin films and nanotechnology; strain and defect
Special Issues, Collections and Topics in MDPI journals

Dr. Dexin Yang

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Guest Editor

College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Interests: spintronics and optoelectronics; ferroelastic properties of functional materials; electromagnetics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the contemporary information society, energy, information and materials are the important foundation of production, life and high technology. Magnetic functional materials are widely used in energy, information and materials science and technology. There are many kinds of magnetic functional materials, and their progress is rapid. Magnetic functional materials have attracted a great deal of attention regarding their applications. Magnetic behaviors are widespread in a variety of materials, such as metals, ceramics, organics, and emerging 2D materials. Applications of magnetic materials include memories, sensors, magnetic refrigeration, drug delivery, NMR, electrochemistry, environmental protection, energy storage, and more. Magnetic functional materials are a hot topic. This Special Issue on “Magnetic functional materials: Synthesis, Characterization and Application - 2nd Volume” will provide a valuable and timely forum for sharing recent advances in the synthesis, fundamentals, characterization, and applications of magnetic materials.

Dr. Haiou Wang
Dr. Dexin Yang
Guest Editors

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Keywords

magnetic functional materials
materials fabrication and characterization
magnetic refrigeration
permanent magnets
memories and sensors
environmental protection
devices based on magnetic materials

Published Papers (5 papers)

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Research

21 pages, 8270 KiB

Open AccessArticle

Effects of Partial Manganese Substitution by Cobalt on the Physical Properties of Pr_0.7Sr_0.3Mn_(1−x)Co_xO₃ (0 ≤ x ≤ 0.15) Manganites

by Feriel Zdiri, José María Alonso, Taoufik Mnasri, Patricia de la Presa, Irene Morales, José Luis Martínez, Rached Ben Younes and Pilar Marin

Materials 2023, 16(4), 1573; https://doi.org/10.3390/ma16041573 - 13 Feb 2023

Cited by 1 | Viewed by 1426

Abstract

We have investigated the structural, magnetic, and electrical transport properties of Pr_0.7 Sr_0.3 Mn_(1−x)Co_x O₃ nanopowders (x = 0, 0.05, 0.10 and 0.15). The Pechini Sol-gel method was used to synthesize these nanopowders. X-ray diffraction at room temperature shows that all the nano powders have an orthorhombic structure of Pnma space group crystallography. The average crystallite size of samples x = 0, 0.05, 0.10, and 0.15 are 33.78 nm, 29 nm, 33.61 nm, and 24.27 nm, respectively. Semi-quantitative chemical analysis by energy dispersive spectroscopy (EDS) confirms the expected stoichiometry of the sample. Magnetic measurements indicate that all samples show a ferromagnetic (FM) to paramagnetic (PM) transition with increasing temperature. The Curie temperature T_C gradually decreases (300 K, 270 K, 250 K, and 235 K for x = 0, 0.05, 0.10, and 0.15, respectively) with increasing Co concentrations. The M-H curves for all compounds reveal the PM behavior at 300 K, while the FM behavior characterizes the magnetic hysteresis at low temperature (5 K). The electrical resistivity measurements show that all compounds exhibit metallic behavior at low temperature (T < T

ρ

) well fitted by the relation

ρ

ρ

₀ +

ρ

₂T² +

ρ

_4.5T^4.5 and semiconductor behavior above Tρ (T > T

ρ

), for which the electronic transport can be explained by the variable range hopping model and the adiabatic small polaron hopping model. All samples have significant magnetoresistance (MR) values, even at room temperature. This presented research provides an innovative and practical approach to develop materials in several technological areas, such as ultra-high density magnetic recording and magneto resistive sensors. Full article

(This article belongs to the Special Issue Magnetic Functional Materials: Synthesis, Characterization and Application - 2nd Volume)

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12 pages, 6336 KiB

Open AccessArticle

Structure and Magnetic Properties of SrFe_12−xIn_xO₁₉ Compounds for Magnetic Hyperthermia Applications

by Polina I. Nikolenko, Timur R. Nizamov, Igor G. Bordyuzhin, Maxim A. Abakumov, Yulia A. Baranova, Alexander D. Kovalev and Igor V. Shchetinin

Materials 2023, 16(1), 347; https://doi.org/10.3390/ma16010347 - 30 Dec 2022

Cited by 3 | Viewed by 1974

Abstract

In this work, complex studies of the structure and magnetic properties of SrFe_12−xIn_xO₁₉ powders obtained by the mechanochemical and citrate methods were carried out. The solubility of In in strontium hexaferrite SrFe₁₂O₁₉ at 1200 °C was determined. The structure and properties of the powders were studied using X-ray diffraction analysis, Mössbauer spectroscopy and scanning electron microscopy. Measurements of magnetic properties in magnetic fields up to 1600 kA/m were also performed. Additionally, the hyperthermia effect was investigated. The possibility of controlling the coercivity of the samples in the range from 188.9 kA/m to 22.3 kA/m and saturation magnetization from 63.5 A·m²/kg to 44.2 A·m²/kg with an increase in the degree of In doping was also demonstrated. Investigation of the magnetic hyperthermia of the samples was carried out by temperature measurement with an IR camera when they were introduced into alternating magnetic fields of various frequencies (144, 261 and 508 kHz) and amplitudes (between 11.96 and 19.94 kA/m). According to the study result, there was detected the heating of the SrFe_12−xIn_xO₁₉ sample (x = 1.7). The highest values of magnetic hyperthermia of the sample were observed in a 19.94 kA/m magnetic field and a frequency of 261 kHz. At a concentration of 56.67 g/L, the sample was heated from 23 to 41 °C within 2 min. The parameters SLP (specific loss power) and ILP (intrinsic loss power) were calculated. Full article

(This article belongs to the Special Issue Magnetic Functional Materials: Synthesis, Characterization and Application - 2nd Volume)

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8 pages, 2409 KiB

Open AccessArticle

The Magnetic Properties and Magnetocaloric Effect of Pr_0.7Sr_0.3MnO₃ Thin Film Grown on SrTiO₃ Substrate

by Bojun Zhao, Xiaojie Hu, Fuxiao Dong, Yan Wang, Haiou Wang, Weishi Tan and Dexuan Huo

Materials 2023, 16(1), 75; https://doi.org/10.3390/ma16010075 - 21 Dec 2022

Cited by 15 | Viewed by 1976

Abstract

The magnetic behaviors and magnetocaloric effect (MCE) of Pr_0.7Sr_0.3MnO₃ (PSMO-7) film grown on a (001) SrTiO₃ single-crystal substrate by a pulsed laser deposition (PLD) were studied in this paper. X-ray diffraction with a high resolution (HRXRD) measurement shows that PSMO-7 film is grown with a (001) single orientation. The magnetic properties and the MCE related to the ferromagnetic (FM) phase transition of the PSMO-7 film are investigated using the temperature dependence of magnetization M(T) and the magnetic field dependence of magnetization M(H). The M(T) data suggest that with decreasing temperatures, the PSMO-7 film goes through the transition from the paramagnetic (PM) state to the FM state at around the Curie temperature (T_C). The T_C (about 193 K) can be obtained by the linear fit of the Curie law. Magnetic hysteresis loop measurements show that the PSMO-7 film exhibits the FM feature at temperatures of 10, 100, and 150 K (low magnetic hysteresis can be found), while the film reveals the PM feature with the temperature increased up to 200 and/or 300 K. The research results of M(H) data are consistent with the M(T) data. Furthermore, the magnetic entropy change (

- Δ S_{M}

) of the PSMO-7 film was studied. It was found that the maximum value of (

- Δ S_{M}

) near T_C reaches about 4.7 J/kg·K under the applied field change of 20 kOe, which is comparable to that of metal Gd (

- Δ S_{M}

of 2.8 J/kg K under 10 kOe), indicating the potential applications of PSMO-7 film in the field of magnetic refrigeration. Full article

(This article belongs to the Special Issue Magnetic Functional Materials: Synthesis, Characterization and Application - 2nd Volume)

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12 pages, 3196 KiB

Open AccessArticle

Morphological Effects of Strain Localization in the Elastic Region of Magnetorheological Elastomers

by Mohd Aidy Faizal Johari, Saiful Amri Mazlan, Nur Azmah Nordin, Seung-Bok Choi, Siti Aishah Abdul Aziz, Shaari Daud and Irfan Bahiuddin

Materials 2022, 15(23), 8565; https://doi.org/10.3390/ma15238565 - 01 Dec 2022

Viewed by 951

Abstract

Strain localization is a significant issue that poses interesting research challenges in viscoelastic materials because it is difficult to accurately predict the damage evolution behavior. Over time, the damage mechanism in the amorphous structure of viscoelastic materials leads to subsequent localization into a shear band, gradually jeopardizing the materials’ elastic sustainability. The primary goal of this study is to further understand the morphological effects and the role of shear bands in viscoelastic materials precipitated by strain localization. The current study aims to consolidate the various failure mechanisms of a sample and its geometry (surface-to-volume ratio) used in torsional testing, as well as to understand their effects on stress relaxation durability performance. A torsional shear load stress relaxation durability test was performed within the elastic region on an isotropic viscoelastic sample made of silicon rubber and a 70% weight fraction of micron-sized carbonyl iron particles. Degradation was caused by a shear band of localized plasticity that developed microscopically due to stress relaxation durability. The failure pattern deteriorated as the surface-to-volume ratio decreased. A field-emission scanning electron microscope (FESEM) and a tapping-mode atomic force microscope (AFM) were used for further observation and investigation of the sample. After at least 7500 cycles of continuous shearing, the elastic sustainability of the viscoelastic materials microstructurally degraded, as indicated by a decline in stress performance over time. Factors influencing the formation of shear bands were observed in postmortem, which was affected by simple micromanipulation of the sample geometry, making it applicable for practical implementation to accommodate any desired performance and micromechanical design applications. Full article

(This article belongs to the Special Issue Magnetic Functional Materials: Synthesis, Characterization and Application - 2nd Volume)

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10 pages, 2661 KiB

Open AccessArticle

Crystalline Orientation-Dependent Ferromagnetism in N⁺-Implanted MgO Single Crystal

by Xingyu Wang, Chunlin Ma, Weiping Zhou and Weishi Tan

Materials 2022, 15(20), 7274; https://doi.org/10.3390/ma15207274 - 18 Oct 2022

Cited by 1 | Viewed by 1169

Abstract

Samples of (110), (100), and (111) MgO single crystals were implanted with 70 keV N ions at room temperature. All as-implanted samples showed room temperature hysteresis in magnetization loops. The observed saturation magnetization (Ms) was 0.79 × 10⁻⁴ emu/g, 1.28 × 10⁻⁴ emu/g, and 1.5 × 10⁻⁴ emu/g for (110), (100) and (111) orientation implanted-MgO and follows the relation Ms(111) > Ms(100) > Ms(110), indicative of crystalline orientation-dependent ferromagnetism in N-implanted MgO. The samples were characterized by X-ray photoelectron spectroscopy (XPS), high resolution X-ray diffraction (HRXRD), reciprocal space mapping (RSM), and photoluminescence (PL). The results indicated that the amount of N-substitute-O and N-interstitial defects in these three N-implanted MgO samples showed the same changing tendency as compared with Ms data. Thus, we conclude that the N-substitute-O and N-interstitial defects may play a crucial role in controlling the N⁺-implanted-induced ferromagnetism. Full article

(This article belongs to the Special Issue Magnetic Functional Materials: Synthesis, Characterization and Application - 2nd Volume)

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