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Magnetism
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Magnetic Surfaces: Thin Films and Nanostructures
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Magnetic Surfaces: Thin Films and Nanostructures

A special issue of Magnetism (ISSN 2673-8724).

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 5646

Special Issue Editors

Dr. Manish Kumar

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Guest Editor
Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
Interests: thin films; magnetism; semiconductors; transparent–oxides; opto-electronic materials; X-ray diffraction; X-ray spectroscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Sanjay Kumar Upadhyay

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Guest Editor
School of Science, Hemvati Nandan Bahuguna Garhwal University, Srinagar 246174, India
Interests: multiferroics; magnetism; ferroelectric material; thin films; quantum spin chain
Dr. Jitendra Pal Singh

E-Mail Website1 Website2
Guest Editor
Department of Physics, Manav Rachna University, Faridabad 121004, India
Interests: X-ray spectroscopy; X-ray imaging; nanocrystals; magnetic systems; ferrites; biomaterials; cathode materials; heavy ion irradiation; ion implantation

Special Issue Information

Dear Colleagues,

The magnetic state of atoms or ions is driven by their co-ordination and the magnetic interactions with the surroundings. The inevitable disturbance of translational symmetry on the surface of a solid and at interfaces is likely to show strong magnetic peculiarities. Due to this reason, surface magnetism is tightly connected with thin films, multilayers and nanoparticles. Surface magnetism has implications in several areas of condensed matter physics, materials science, and nanotechnology. The advancement in magnetic measurement technologies has further excelled the research on surface magnetism for fundamental understanding as well as technological aspects. Therefore, in this Special Issue, the aim is to highlight the latest developments in:

  • Magnetic thin films and multilayers;
  • Magnetic nanoparticles and nanostructures;
  • Interface magnetism;
  • Proximity effect;
  • Magnetic domains;
  • Modification of magnetic surfaces;
  • Neutron and Synchrotron in magnetism.

In this Special Issue, we welcome original research articles as well review articles which cover the fascinating field of surface magnetism. 

Dr. Manish Kumar
Dr. Sanjay Kumar Upadhyay
Dr. Jitendra Pal Singh
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. Magnetism is an international peer-reviewed open access quarterly 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 1000 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

  • magnetic surfaces
  • interface magnetism
  • thin films

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Published Papers (2 papers)

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Research

12 pages, 3565 KiB  
Article
Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique
by Anastasia V. Artemova, Sergey S. Maklakov, Artem O. Shiryaev, Alexey V. Osipov, Dmitry A. Petrov, Konstantin N. Rozanov and Andrey N. Lagarkov
Magnetism 2023, 3(2), 90-101; https://doi.org/10.3390/magnetism3020008 - 23 Apr 2023
Viewed by 1881
Abstract
The relationship between the chemical purity of one-size particles and microwave properties in ferromagnetic materials is not clearly studied. Ferromagnetic nanostructured iron powders were synthesized from iron nitrate solution using ultrasonic spray-pyrolysis and then reduced in H2 flow at 350, 400, 450, [...] Read more.
The relationship between the chemical purity of one-size particles and microwave properties in ferromagnetic materials is not clearly studied. Ferromagnetic nanostructured iron powders were synthesized from iron nitrate solution using ultrasonic spray-pyrolysis and then reduced in H2 flow at 350, 400, 450, and 500 °C. A rise in the concentration of solutions of a precursor from 10 to 20 wt. % led to an increase in mean particle size. The interrelationship was studied between chemical composition and the microwave dispersion of the powders obtained. An increase in the temperature of reduction changes the chemical composition and increases the amplitude of complex microwave permeability, which was studied using solid-state physics methods (XRD, STA, SEM, and VNA). It was found that annealing at 400 °C is the optimal treatment that allows the production of iron powders, consisting of about 90% of α-Fe phase, possessing a particle surface with low roughness and porosity, and demonstrating intense microwave absorption. Annealing at a higher temperature (500 °C) causes an even higher increase in permeability but leads to the destruction of nanostructured spheres into smaller particles due to grain growth. This destruction causes an abrupt increase in permittivity and therefore significantly reduces potential applications of the product. The insight into chemical–magnetic relationships of these materials enhances the data for design applications in magnetic field sensing. Full article
(This article belongs to the Special Issue Magnetic Surfaces: Thin Films and Nanostructures)
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11 pages, 2016 KiB  
Article
Competing Magnetic Interactions in Inverted Zn-Ferrite Thin Films
by Murtaza Bohra, Sai Vittal Battula, Nitesh Singh, Baidyanath Sahu, Anil Annadi and Vidyadhar Singh
Magnetism 2022, 2(2), 168-178; https://doi.org/10.3390/magnetism2020012 - 17 May 2022
Cited by 7 | Viewed by 2762
Abstract
Zn-ferrite is a versatile material among spinels owing to its physicochemical properties, as demonstrated in rich phase diagrams, with several conductive or magnetic behaviors dictated by its cation inversion. The strength and the type of cation inversion can be manipulated through the various [...] Read more.
Zn-ferrite is a versatile material among spinels owing to its physicochemical properties, as demonstrated in rich phase diagrams, with several conductive or magnetic behaviors dictated by its cation inversion. The strength and the type of cation inversion can be manipulated through the various thermal treatment conditions. In this study, inverted Zn-ferrite thin films prepared from radio frequency magnetron sputtering were subjected to different in situ (in vacuum) and ex situ (in air) annealing treatments. The temperature and field dependence of magnetization behaviors reveal multiple magnetic interactions compared to its bulk antiferromagnet behavior. Using the magnetic component model, the different magnetic interactions can be explained in terms of superparamagnetic (SPM), paramagnetic (PM), and ferrimagnetic (FM) contributions. At low temperatures, the SPM and FM contributions can be approximated to the hard and soft ferrimagnetic phases of Zn-ferrite, respectively, which changes with the annealing temperature and sputter power. Distinct magnetic properties emanating from in situ annealing compared to the ex situ annealing were ascribed to the nonzero Fe2+/Fe3+ ratio, leading to the different magnetic interactions. The anisotropy was found to be the key parameter that governs the behavior of annealed in situ samples. Full article
(This article belongs to the Special Issue Magnetic Surfaces: Thin Films and Nanostructures)
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