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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (20 February 2025) | Viewed by 7110

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Dr. R. Raudel Peña-Garcia

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Guest Editor

Academic Unit of Cabo de Santo Agostinho, Federal Rural University of Pernambuco, Cabo de Santo Agostinho 54589-899, Brazil
Interests: magnetism and magnetic properties; nanomaterials; micromagnetic simulation; sol–gel; magnetic oxides; magnetic nanostructures; diluted magnetic semiconductors; ZnO; YIG
Special Issues, Collections and Topics in MDPI journals

Dr. Yuset Guerra Dávila

E-Mail Website1 Website2
Guest Editor

Institute of Physics, Federal University of Alagoas, Maceió 57072-900, AL, Brazil
Interests: magnetism and magnetic properties; nanomaterials; micromagnetic simulation; sol–gel; magnetic oxides; magnetic nanostructures; diluted magnetic semiconductors; ZnO; YIG
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Applied Sciences invites submission of original research articles, review articles, or short communications to this Special Issue entitled “Functional Magnetic Materials and Devices: Recent Advances and Applications.” The Special Issue will encompass all areas of functional magnetic materials, including magnetic materials, diluted magnetic semiconductors, electromagnetic radiation-absorbing magnetic materials, micromagnetic simulation, and ferromagnetic resonance. It will include topics about the properties, characterization, devices, instrumentation, and applications of magnetic materials. Topics such as magnetic materials applied to human and biological science are welcome. Magnetic materials applied to sensors, electronic devices, and other areas are the focus of the present Special Issue, and studies about core@shell nanoparticles, nanometric films, and nanowires are some examples of magnetic systems. We invite you to submit original research articles that belong to any of the following categories:

Magnetic properties;
Hard magnetic materials;
Soft magnetic materials;
Magnetocaloric materials;
Magnetic nanoparticles;
Magnetic materials in data storage;
Magnetization reversal dynamics;
Micromagnetic models;
Smart composite materials;
Magnetic nanostructures;
Machine learning for property predictions in materials;
Magnetic biosensors.

Dr. R. Raudel Peña-Garcia
Dr. Yuset Guerra Dávila
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

functional magnetic materials
devices
films
nanowires
sensors
electronic devices
diluted magnetic semiconductors

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Published Papers (4 papers)

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Research

14 pages, 3844 KiB

Open AccessArticle

Correlation Between the Crystal Structure and Magnetic Properties of Bi_1−yCa_yFe_1−xMn_xO₃ Multiferroics near the Polar-Anti(non)polar Phase Boundary

by Vladimir A. Khomchenko, Mithila Das and José António Paixão

Appl. Sci. 2024, 14(21), 9991; https://doi.org/10.3390/app14219991 - 1 Nov 2024

Cited by 1 | Viewed by 1332

Abstract

This paper reports the results of a systematic investigation into the magnetic properties of Bi_1−yCa_yFe_1−xMn_xO₃ (0.1 ≤ y ≤ 0.175, 0.35 ≤ x ≤ 0.45) solid solutions. The substitution of Bi³⁺ with Ca²⁺ and the concurrent introduction of Mn³⁺/Mn⁴⁺ ions result in the stabilization of various structural phases, with each exhibiting distinct magnetic characteristics. The investigation indicates that the samples containing the polar rhombohedral phase display metamagnetic transitions at low temperatures, characterized by pronounced jumps in magnetization. Single-phase samples with a nonpolar orthorhombic structure exhibit weak ferromagnetic behavior without metamagnetic features. The observed metamagnetic behavior, accompanied by anomalies in temperature-dependent magnetization and significant remnant magnetization at low temperatures, particularly in samples near the polar-anti(non)polar phase boundary, highlighted the presence of both antiferromagnetic and glassy magnetic components. Full article

(This article belongs to the Special Issue Functional Magnetic Materials and Devices: Recent Advances and Applications)

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15 pages, 4455 KiB

Open AccessArticle

Binder System Composition on the Rheological and Magnetic Properties of Nd-Fe-B Feedstocks for Metal Injection Molding

by Vahid Momeni, Sorana Luca, Joamin Gonzalez-Gutierrez, Santiago Cano, Emilie Sueur, Zahra Shahroodi, Stephan Schuschnigg, Christian Kukla and Clemens Holzer

Appl. Sci. 2024, 14(13), 5638; https://doi.org/10.3390/app14135638 - 28 Jun 2024

Cited by 1 | Viewed by 1932

Abstract

The applications of Nd-Fe-B-based magnets are experiencing significant diversification to achieve efficiency and miniaturization in different technologies. Metal injection molding (MIM) provides new opportunities to manufacture Nd-Fe-B magnets with high geometrical complexity efficiently. In this study, the impacts of the binder system composition and powder loading on the rheological behavior, contamination, and magnetic properties of the Nd-Fe-B MIM parts were investigated. A high-pressure capillary rheometer was used to measure the apparent viscosity and pressure drops for feedstocks with different binder formulations and powder contents. Also, oxygen and carbon contamination, density, and magnetic properties were measured for different feedstock formulations and powder loadings. From the rheological, density, and magnetic properties points of view, the binder system consisting of 45 vol.% LLDPE as backbone was selected as the optimum formulation. The findings indicated that the sample with this binder system and 55 vol.% powder content had a high density (6.83 g/cm³), remanence (0.591 T), and coercivity (744.6 kA/m) compared to other binder compositions. By using 58 vol.% powder loading, the values of density (7.54 g/cm³), remanence (0.618 T), and carbon residue (982 ppm) improved, and a suitable rheological behavior was still observed. Thus, a suitable feedstock formulation was developed. Full article

(This article belongs to the Special Issue Functional Magnetic Materials and Devices: Recent Advances and Applications)

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12 pages, 4355 KiB

Open AccessArticle

Effects of Buffer and Capping Layers on Thermal Stability of CoFeB/MgO Frames at Various Temperatures

by Byeongwoo Kang, Young Hyun Hwang, Yong Jin Kim, Jong Seong Lee, Seo Hyun Song, Seungwon Lee, Jisung Lee, OukJae Lee, Seung-Young Park and Byeong-Kwon Ju

Appl. Sci. 2024, 14(6), 2394; https://doi.org/10.3390/app14062394 - 12 Mar 2024

Viewed by 1846

Abstract

The utilization of CoFeB thin films in spintronic devices has attracted significant attention due to their exceptional magnetic properties, which include high saturation magnetization and spin polarization. However, the effect of ambient temperature on the magnetic properties of CoFeB/MgO frames, particularly those with different buffer and capping layers, remains unexplored. Therefore, in this study, the magnetostatic and dynamic properties of CoFeB/MgO frames were investigated at various temperatures. Using vibrating sample magnetometry and ferromagnetic resonance spectroscopy, changes in key parameters such as saturation magnetization, the Gilbert damping constant, magnetic anisotropy field, in-plane uniaxial magnetic anisotropy energy, and thermal stability factor were investigated. Furthermore, the thermal stabilities of CoFeB/MgO frames with Ta buffer and capping layers were compared with those of CoFeB/MgO frames with W buffer and capping layers by examining the changes in the key parameters at various temperatures. These results reveal that the thermal stability of the latter surpassed that of the former. This study provides significant insights for the development of thermally robust spintronic devices capable of operating above room temperature. Full article

(This article belongs to the Special Issue Functional Magnetic Materials and Devices: Recent Advances and Applications)

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13 pages, 488 KiB

Open AccessArticle

Competition between Electron–Phonon and Spin–Phonon Interaction on the Band Gap and Phonon Spectrum in Magnetic Semiconductors

by Angel T. Apostolov, Iliana N. Apostolova and Julia M. Wesselinowa

Appl. Sci. 2024, 14(5), 1686; https://doi.org/10.3390/app14051686 - 20 Feb 2024

Viewed by 1355

Abstract

Using the microscopic s-f model and Green’s function theory, we study the temperature dependence of the band gap energy

E_{g}

and the phonon energy

ω

and damping

γ

of ferro- and antiferromagnetic semiconductors, i.e., with different signs of the s-f interaction constant [...] Read more.

Using the microscopic s-f model and Green’s function theory, we study the temperature dependence of the band gap energy

E_{g}

and the phonon energy

ω

and damping

γ

of ferro- and antiferromagnetic semiconductors, i.e., with different signs of the s-f interaction constant I. The band gap is a fundamental quantity which affects various optical, electronic and energy applications of the materials. In the temperature dependence of

E_{g}

and the phonon spectrum, there is a kink at the phase transition temperature

T_{C}

T_{N}

due to the anharmonic spin–phonon interaction (SPI) R. Moreover, the effect of the SPI R and electron–phonon interaction (EPI) A on these properties is discussed. For

I > 0, R > 0

E_{g}

decreases with increasing SPI and EPI, whereas for

I < 0, R > 0

, there is a competition;

E_{g}

increases with raising the EPI and decreases for enhanced SPI. For

R < 0

, in both cases, the SPI and EPI reduce

E_{g}

. The magnetic field dependence of

E_{g}

for the two signs of I and R is discussed. The SPI and EPI lead to reducing the energy of the phonon mode

ω

= 445 cm⁻¹ in EuO (

I > 0

R < 0

), whereas

ω

= 151 cm⁻¹ in EuSe (

I > 0

R > 0

) is enhanced with increasing EPI and reduced with SPI. Both the SPI and EPI lead to an increasing of the phonon damping in EuO and EuSe. The results are compared with the existing experimental data. Full article

(This article belongs to the Special Issue Functional Magnetic Materials and Devices: Recent Advances and Applications)

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