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Magnetochemistry
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Magnetic and Transport Properties of Thin-Film Materials
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Magnetic and Transport Properties of Thin-Film Materials

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (20 April 2023) | Viewed by 12772

Special Issue Editor

Dr. José Vergara

E-Mail Website
Guest Editor
Science Department, Public University of Navarre, Pamplona, Spain
Interests: magnetic properties of thin films; nanomorphology of thin films; hard magnetic materials; applications of magnetic materials at ultra-high frequencies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The observation of giant magnetoresistance in Fe–Cr thin films by the groups of Prof. Fert and Prof. Gründberg boosted the research into the magnetic and transport properties of thin films. Thus, in the last thirty years, research areas such as spintronics, spin injections, magnetic semiconductors and spin transfer torque have emerged and they have initiated a revolution in the field of integrated magnetic sensors and magnetic memories.

In spite of the huge amount of research produced by the scientific community, there is still a challenge to improve and discover new materials and new mechanisms to increase the memory and processing capabilities as well as to reduce the power consumption of these magnetic devices.

The aim of this Special Issue of Magnetochemistry, Magnetic and Transport Properties of Thin-Film Materials, is to provide an opportunity for researchers and scientists to share their work and their investigations on materials science connected to spin transport in thin films and other related topics.

You may choose our Joint Special Issue in Applied Sciences.

Dr. José Vergara
Guest Editor

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. Magnetochemistry is an international peer-reviewed open access monthly 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 2700 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

  • spintronics
  • magnetic semiconductors
  • spin transfer torque
  • magnetoresistance
  • thin films
  • complex oxide films
  • spin orbit coupling
  • magnetic heterostructures

Published Papers (6 papers)

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Research

10 pages, 3743 KiB  
Article
Modelling of Magnetic Stray Fields in Multilayer Magnetic Films with In-Plane or Perpendicular Anisotropy
by Sai Zhou, Yiyue Wang and Yaowen Liu
Magnetochemistry 2022, 8(11), 159; https://doi.org/10.3390/magnetochemistry8110159 - 19 Nov 2022
Viewed by 1759
Abstract
The magnetic stray field is an unavoidable consequence of magnetic multilayers, which may have a significant influence on the performance of spintronic devices. Based on Maxwell’s magnetostatics theory, here we numerically calculated the distributions of magnetic stray fields and self-demagnetizing fields in a [...] Read more.
The magnetic stray field is an unavoidable consequence of magnetic multilayers, which may have a significant influence on the performance of spintronic devices. Based on Maxwell’s magnetostatics theory, here we numerically calculated the distributions of magnetic stray fields and self-demagnetizing fields in a series of patterned multilayer thin-film structures with either an in-plane or a perpendicularly magnetized ferromagnetic layer. The stray field above the ferromagnetic layer is inhomogeneous, showing the dramatic changes near the sample edge, but the uniformity in the center region could be improved with the increasing sample size. The stray field strength tends to zero for large samples, increases with the increase in the hard-layer thickness, and decreases with the increase in the distance D away from the ferromagnetic layer. In the multilayer samples, the separately simulated stray field and self-demagnetizing field within the soft layer agree well with the classic magnetostatic relationship of B=μ0(Hd+M). For the in-plane magnetized trilayer sample, the magnetic-flux density within the soft ferromagnetic layer slightly decreases in the antiparallel magnetization alignment and increases in the parallel alignment state with the increase in the intermediate non-magnetic-layer thickness. In contrast, for the sample with the perpendicular magnetization, the magnetic-flux density decreases as the non-magnetic layer is thickened for both the antiparallel and parallel state. This study may provide a theoretical basis for the design of thin-film spintronic devices. Full article
(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)
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22 pages, 6423 KiB  
Article
Impact of an Induced Magnetic Field on the Stagnation-Point Flow of a Water-Based Graphene Oxide Nanoparticle over a Movable Surface with Homogeneous–Heterogeneous and Chemical Reactions
by Umair Khan, Aurang Zaib, Anuar Ishak, Abeer M. Alotaibi, Samia Elattar, Ioan Pop and Ahmed M. Abed
Magnetochemistry 2022, 8(11), 155; https://doi.org/10.3390/magnetochemistry8110155 - 12 Nov 2022
Cited by 5 | Viewed by 1490
Abstract
Water has attracted plenty of attention as a lubricant for manufacturing due to the fact that it is inexpensive, environmentally friendly, and efficient. Because of their outstanding mechanical capabilities, water dispensability, and range of real applications, graphene oxide (GO) materials have the potential [...] Read more.
Water has attracted plenty of attention as a lubricant for manufacturing due to the fact that it is inexpensive, environmentally friendly, and efficient. Because of their outstanding mechanical capabilities, water dispensability, and range of real applications, graphene oxide (GO) materials have the potential to augment the effectiveness of water lubrication. With this encouragement, we inspect the impact of induced magnetism on the fluid flow near a stagnation point dispended with water-based GO nanoparticles caused by a movable surface with a homogeneous–heterogeneous chemical reaction. The leading equations and their related boundary constraints are first transformed into a non-dimensional form through the utilization of the similarity technique. The consequent equations are then numerically solved by employing the bvp4c scheme. Those figures are used to exemplify the stimulation of the relevant constraints on the fluid flow, induced magnetic profiles, temperature profiles, concentration profiles, heat transfer, and friction factor. It is observed that the nanoparticle’s volume fraction enhances the heat transfer rate, as well as the friction factor. The heat transfer and friction factor escalate by almost 11.71% and 0.96% for the respective upper-branch solutions due to the larger impacts of nanoparticles’ volume fractions, while for the lower-branch solutions, they are augmented at about 21.8% and 0.66%, respectively. In addition, double solutions can be found in the limited values of a movable parameter. Full article
(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)
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8 pages, 1414 KiB  
Article
Interface Effects on Magnetic Anisotropy and Domain Wall Depinning Fields in Pt/Co/AlOx Thin Films
by Babu Ram Sankhi, Ujjal Lamichhane, Soumya Mandal, Ritesh Sachan, Emrah Turgut and Derek Meyers
Magnetochemistry 2022, 8(11), 154; https://doi.org/10.3390/magnetochemistry8110154 - 12 Nov 2022
Cited by 2 | Viewed by 2050
Abstract
We report the dependence of the domain wall depinning field, domain wall velocity, including anisotropy direction, and magnetic properties on the oxidized aluminum thickness of perpendicularly magnetized asymmetric Pt/Co/AlOx trilayers. We also adopt the low-temperature magneto-transport measurement technique to investigate the amount [...] Read more.
We report the dependence of the domain wall depinning field, domain wall velocity, including anisotropy direction, and magnetic properties on the oxidized aluminum thickness of perpendicularly magnetized asymmetric Pt/Co/AlOx trilayers. We also adopt the low-temperature magneto-transport measurement technique to investigate the amount of oxygen at the Co/AlOx interface of our magnetic thin films. At the lowest temperature of 25 K, it is found that the coercivity for the 5 nm aluminum thickness sample is very close to the average value and coercivity diminished above and below this critical aluminum thickness, hinting at a large variation in CoOx content at the interface. This tendency is also consistent with the modification of the depinning fields, coercive fields, and surface roughness measured at room temperature. Our results highlight an efficient way of controlling the depinning fields and other magnetic characteristics, which is important for stabilizing and driving magnetic spin textures and applicable to energy-efficient next-generation spintronics devices. Full article
(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)
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10 pages, 3188 KiB  
Article
Dynamic Bloch Chirality and Enhanced Velocities from Spin-Orbit Torque Driven Domain Wall Motion in Thick Magnetic Films
by Trae Lawrence Staggers and Shawn David Pollard
Magnetochemistry 2022, 8(10), 119; https://doi.org/10.3390/magnetochemistry8100119 - 06 Oct 2022
Viewed by 1444
Abstract
Spin-orbit torque (SOT) driven domain wall motion has attracted significant attention as the basis for a variety of spintronic devices due to its potential use as a high speed, low power means to manipulate the magnetic state of an object. While most previous [...] Read more.
Spin-orbit torque (SOT) driven domain wall motion has attracted significant attention as the basis for a variety of spintronic devices due to its potential use as a high speed, low power means to manipulate the magnetic state of an object. While most previous attention has focused on ultrathin films wherein the material thickness is significantly less than the magnetic exchange length, recent reports have suggested unique dynamics may be achieved in intermediate and high thickness films. We used micromagnetic modelling to explore the role of the vertically non-uniform spin textures associated with the domain wall in nanowires of varying thickness on SOT driven domain wall motion. We found large velocity asymmetries between Bloch chiralities near the current density required for reversal of the Bloch component of the magnetization and linked these asymmetries to a gradual reorientation of the domain wall structure which drives a non-negligible, chiral Néel component of the domain wall. We further explored the influence of saturation magnetization, film thickness, the Dzyaloshinskii-Moriya interaction, and in-plane fields on domain wall dynamics. These results provide a framework for the development of SOT based devices based on domain wall motion in nanowires beyond the ultrathin film limit. Full article
(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)
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13 pages, 1959 KiB  
Article
Influence of Bi Content on the Temperature of the Formation of the Hard Magnetic MnBi Phase: Simultaneous Irreversible Drop of Resistance
by José Vergara, Cristina Favieres and Vicente Madurga
Magnetochemistry 2022, 8(8), 82; https://doi.org/10.3390/magnetochemistry8080082 - 29 Jul 2022
Viewed by 1523
Abstract
Pulsed laser-deposited (PLD) MnBi films were fabricated by alternating deposition of Mn and Bi layers. In order to obtain the ferromagnetic MnBi phase, heat treatments were performed on the samples. Simultaneously, the resistance of the samples was monitored as a function of the [...] Read more.
Pulsed laser-deposited (PLD) MnBi films were fabricated by alternating deposition of Mn and Bi layers. In order to obtain the ferromagnetic MnBi phase, heat treatments were performed on the samples. Simultaneously, the resistance of the samples was monitored as a function of the temperature. Thus, on increasing the temperature, a steep decrease in the resistance of the films was observed, simultaneous to the onset of the formation of the MnBi phase. At room-temperature, these annealed samples showed a ferromagnetic behavior, as well as the presence of the characteristic LT-MnBi phase diffraction peaks in the X-ray diffraction patterns. The temperature of the generation of the MnBi phase depended on the relative concentration of Mn and Bi in the different samples: on increasing the Bi atomic concentration, the temperature of the generation of the MnBi phase decreased. Full article
(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)
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10 pages, 2721 KiB  
Article
Analysis of Low-Temperature Magnetotransport Properties of NbN Thin Films Grown by Atomic Layer Deposition
by Sahitya V. Vegesna, Sai V. Lanka, Danilo Bürger, Zichao Li, Sven Linzen and Heidemarie Schmidt
Magnetochemistry 2022, 8(3), 33; https://doi.org/10.3390/magnetochemistry8030033 - 09 Mar 2022
Viewed by 3628
Abstract
Superconducting niobium nitride (NbN) films with nominal thicknesses of 4 nm, 5 nm, 7 nm, and 9 nm were grown on sapphire substrates using atomic layer deposition (ALD). We observed probed Hall resistance (HR) ( [...] Read more.
Superconducting niobium nitride (NbN) films with nominal thicknesses of 4 nm, 5 nm, 7 nm, and 9 nm were grown on sapphire substrates using atomic layer deposition (ALD). We observed probed Hall resistance (HR) (Rxy) in external out-of-plane magnetic fields up to 6 T and magnetoresistance (MR) (Rxx) in external in-plane and out-of-plane magnetic fields up to 6 T on NbN thin films in Van der Pauw geometry. We also observed that positive MR dominated. Our study focused on the analysis of interaction and localisation effects on electronic disorder in NbN in the normal state in temperatures that ranged from 50 K down to the superconducting transition temperature. By modelling the temperature and magnetic field dependence of the MR data, we extracted the temperature-dependent Coulomb interaction constants, spin–orbit scattering lengths, localisation lengths, and valley degeneracy factors. The MR model allowed us to distinguish between interaction effects (positive MR) and localisation effects (negative MR) for in-plane and out-of-plane magnetic fields. We showed that anisotropic dephasing scattering due to lattice non-idealities in NbN could be neglected in the ALD-grown NbN thin films. Full article
(This article belongs to the Special Issue Magnetic and Transport Properties of Thin-Film Materials)
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