Applied Sciences

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Dr. R. Raudel Peña-Garcia

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Guest Editor

Federal Rural University of Pernambuco, Unidade Acadêmica do Cabo de Santo Agostinho, Cabo de Santo Agostinho 54518-430, PE, Brazil
Interests: condensed matter physics; magnetic properties; ferromagnetic resonance; synthesis and characterization of magnetic thin films; magnetic nanoparticles; diluted magnetic semiconductors; magnetic materials for photocatalytic applications

Dr. Yuset Guerra Dávila

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Guest Editor

Department of Physics, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
Interests: magnetism and magnetic properties; nanomaterials; micromagnetic simulation; sol–gel; magnetic oxides; magnetic nanostructures; diluted magnetic semiconductors; ZnO; YIG

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

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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.

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Keywords

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

Published Papers (2 papers)

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Research

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 515

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 482

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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