Article
Nanoscience & Nanotechnology
S. A. Chambers, D. Lee, Z. Yang, Y. Huang, W. Samarakoon, H. Zhou, P. Sushko, T. K. Truttmann, L. W. Wangoh, T-L Lee, J. Gabel, B. Jalan
Summary: In this study, we investigate the formation of insulating layers in high-mobility homoepitaxial n-SrTiO3(001) films using state-of-the-art oxide epitaxial growth and various experimental and modeling techniques. Our analysis suggests that charge immobilization at the buried interface and surface contamination layer are the driving factors for electronic dead-layer formation.
Article
Optics
Paul Schmitt, Sven Stempfhuber, Nadja Felde, Adriana Szeghalmi, Norbert Kaiser, Andreas Tuennermann, Stefan Schwinde
Summary: This long-term study explores the use of various seed layers to significantly enhance the reflectance of aluminum coatings and reduce long-term degradation, potentially improving the overall performance of reflective coatings.
Article
Chemistry, Physical
Nalin Prashant Poddar, J. Arout Chelvane, N. D. Vara Prasad, M. Manivel Raja
Summary: In this paper, the relationship between the structure-magnetic microstructure and magnetic properties of sputtered Fe-Co-Al thin films at different thicknesses is investigated. The results show that the crystallinity and particle size of the films increase with the increase in film thickness. The magnetic properties, including saturation magnetization and coercivity, change with the film thickness due to the observed changes in the magnetic microstructure. Evaluation: 8/10.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Anh Tuan Thanh Pham, Nhut Minh Ngo, Oanh Kieu Truong Le, Dung Van Hoang, Truong Huu Nguyen, Thang Bach Phan, Vinh Cao Tran
Summary: Point-defect engineering through fluorine doping enhances crystal quality and mobility of zinc oxide films. Optimum F content of 1% reduces defects and improves performance, while higher F content leads to increased defect concentration and degraded structure.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2021)
Article
Materials Science, Multidisciplinary
T. Sanjana, M. Anantha Sunil, Habibuddin Shaik, K. Naveen Kumar
Summary: Oxygen flow rate significantly influences the properties and bandgap of cuprous oxide thin films during the preparation process. Various characterization tools were used to study the structure, morphology, elemental composition, and optical characteristics of the films. The bandgap of the deposited thin films falls within the range suitable for thin-film solar cell applications.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Physics, Applied
Gianluca Gubbiotti, Alexandr Sadovnikov, Evgeny Beginin, Sergey Nikitov, Danny Wan, Anshul Gupta, Shreya Kundu, Giacomo Talmelli, Robert Carpenter, Inge Asselberghs, Iuliana P. Radu, Christoph Adelmann, Florin Ciubotaru
Summary: This research investigates the characteristics of spin waves in vertical meander-shaped Co40Fe40B20 thin films using Brillouin-light-scattering spectroscopy. The study reveals the presence of frequency band gaps at specific wave numbers, which can be controlled by changing the geometrical parameters of the film.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Physical
Xu Xu, Haoyang Huang, Lichuan Jin, Tianlong Wen, Yulong Liao, Xiaoli Tang, Yuanxun Li, Zhiyong Zhong
Summary: Ni80Fe20 (NiFe) films were deposited on periodically rippled Al2O3 substrates by two different template oblique angle deposition (OAD) processes at various oblique deposition angles alpha (0 degrees <= alpha <= 60 degrees). The disparate in-plane uniaxial magnetic anisotropy (UMA) caused by the two template deposition processes of films was revealed by magneto-optical Kerr effect (MOKE) loops and ferromagnetic resonance (FMR) measurements. The analysis of Transmission electron microscopy images indicated that this was related to the different micromorphology of the films due to the two template deposition processes. The angle between substrates' ripple direction and the material flow incident direction would strongly influence the micromorphology and the induced in-plane UMA field of films.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Salih Colmekci, Ali Karpuz, Hakan Kockar
Summary: Nickel-containing magnetic films have attracted attention due to their outstanding properties. In this study, Ni/Cu multilayer films with different thicknesses of the Ni layers were produced by magnetron sputtering. The results showed that as the Ni layer thickness decreased, the surface quality improved, saturation magnetization decreased, coercivity and remanent magnetization decreased. The multilayer film with a Ni layer thickness of 42.5 nm exhibited the best magnetic properties.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Xu Xu, Lei Zheng, Lichuan Jin, Tianlong Wen, Yulong Liao, Xiaoli Tang, Huaiwu Zhang, Zhiyong Zhong
Summary: This study investigated the ferromagnetic damping and relaxation mechanisms of Ni80Fe20 (NiFe) films sputtered on rippled Al2O3 substrates formed by thermal annealing. It was found that the ferromagnetic damping of films can be manipulated by modifying the ripple morphology of substrates, with two-magnon scattering and inhomogeneous broadening dominating the variation of total linewidth as non-Gilbert damping mechanisms. The results provide insights into tunable magnetization relaxation in films deposited on rippled Al2O3 substrates, which could be useful for designing magnetization relaxation characteristics in spintronic and magnonic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Pao-Hsun Huang, Sih-An Chen, Li-Wei Chao, Jia-Xun Xie, Ching-Yu Liao, Zong-Liang Tseng, Sheng-Hui Chen
Summary: This study proposes the use of sputtered NiO films as a hole inject layer (HIL) to replace acidic PEDOT:PSS, improving the stability and performance of perovskite quantum dot (QD) based LEDs.
Article
Materials Science, Multidisciplinary
Peiyang Sun, Yue Shen, Yibo Kuang, Dandan Wen, Jian Huang, Feng Gu, Jiahua Min, Linjun Wang
Summary: In this study, CdZnTe films with less defects and high quality were fabricated on aluminum-rich AlN transition layers. The effects of Al doping and regulation on defect states, structure, and photoelectrical performance of CdZnTe films were investigated. The results indicated that the self-doping process of Al from Al-AlN transition layers helped to compensate the defect density in CdZnTe films, leading to improvements in crystallization, response performances, and resistivity of Al-doped CdZnTe films. This study demonstrated the feasibility of high-quality film detectors for solar-blind UV detection.
Article
Physics, Applied
Hanbyeol Jeong, Nicholas G. Combs, Simon Munyan, Arman Rashidi, Susanne Stemmer
Summary: The use of EuTiO3 thin films as capping layers can prevent surface carrier depletion in doped SrTiO3 films, allowing for the fabrication of thin and conducting heterostructures. Additionally, the superconducting transition temperature of SrTiO3 films decreases systematically with reduced film thickness, possibly due to proximity effects.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Anton Maydykovskiy, Marina Temiryazeva, Alexey Temiryazev, Tatiana Murzina
Summary: The structure of magnetic domains is a fascinating research topic with a wide variety of patterns. In this study, we used nonlinear optical microscopy to visualize the interface magnetic domains of a (LuBi)(3)Fe5O12 film and found that the domains were qualitatively similar at both garnet/air and garnet/substrate interfaces. We also demonstrated the potential of third harmonic generation microscopy as an extension of second harmonic generation microscopy, which offers higher resolution.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Ke Wang, Xiaopeng Xiao, ZiKun Xu, Liang Wu, Jian Liu
Summary: Perpendicular magnetic anisotropy was observed in Co2FeSi films sandwiched between MgO and Pt layers after annealing, with the thickness of a magnetic dead layer increasing monotonically with annealing temperature. The positive contributions to the perpendicular magnetic anisotropy made by the Pt/CFS and CFS/MgO interfaces were experimentally verified.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yuki Yoshihara, Tomoya Sugita, Pang Boey Lim, Yasuyuki Tamba, Hiroaki Inoue, Kazushi Ishiyama, Mitsuteru Inoue, Caroline A. Ross, Taichi Goto
Summary: Polycrystalline cerium-substituted yttrium iron garnet (Ce:YIG) films with various thicknesses were deposited on synthetic fused silica substrates using ion beam sputtering. The films were characterized for their roughness, transmissivity, optical constants, microstructure, and magnetic and magnetooptical properties. Thicker films exhibited cracking due to thermal mismatch stress. A 5 nm thick amorphous layer was observed at the interface between Ce:YIG and the substrates, leading to a non-monotonic thickness dependence of the measured properties. A 338 nm thick Ce:YIG film showed the largest magnetooptical figure of merit, with a ratio of Faraday rotation angle to absorption coefficient of 127 degrees/dB at a wavelength of 1550 nm, more than three times larger than prior work.
Article
Materials Science, Multidisciplinary
Anup Kumar, Rui Zhang, M. Venkatesan, Plamen Stamenov, J. M. D. Coey
Summary: Three natural hematite specimens were characterized with a focus on the Morin transition, revealing the presence of lamellae, nanoparticles, and ultra-fine nanoparticles. The material exhibited antiferromagnetic order at room temperature, with some superparamagnetic iron contributing to a quadrupole doublet in the Mossbauer spectrum. However, the characteristic weak net moment due to spin canting was absent.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
Zexiang Hu, Jean Besbas, Ross Smith, Niclas Teichert, Gwenael Atcheson, Karsten Rode, Plamen Stamenov, J. M. D. Coey
Summary: Toggle switching behavior is observed in thin films of sperimagnetic amorphous DyxCo1-x and TbxCo1-x irradiated with single fast laser pulses. The films exhibit strong local random anisotropy, and subsequent laser pulses lead to partial re-switching of a decreasing amount of material, resulting in a granular structure. The toggle switching is attributed to the temperature-dependent ratio of local anisotropy to exchange.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Udara Bimendra Gunatilake, Munuswamy Venkatesan, Lourdes Basabe-Desmonts, Fernando Benito-Lopez
Summary: Biocompatible magnetic hydrogels are important for safer biological and environmental applications. This study synthesized three types of magnetic alginate beads and characterized their physicochemical properties. The beads exhibited stable behavior in aqueous solution, which is essential for magneto-driven applications such as targeted drug delivery and water purification.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
J. M. D. Coey, D. Givord, D. Fruchart
Summary: This article presents energy-level diagrams for cubic metallic Fe4N and Mn4N, describing their magnetic properties. The magnetic ordering and tunable ferrimagnetic compensation in Mn3-xM'N-x metallic perovskites are discussed, along with the characteristics of topological ferrimagnets. The article emphasizes the wide range of applications in magnetic structures, magnetotransport, magnetocaloric, and magnetovolume effects in metallic perovskites.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Crystallography
Pelin Tozman, Yukiko Takahashi, Munuswamy Venkatesan, Lorena Monzon, Michael Coey, Orhan Kamer
Summary: The synthesis of FePt powders with an average particle size of 1 mu m is achieved using a compact spark erosion device, without the need for cryogenic temperatures or conventional powder processing. The effect of annealing on the transition from the disordered to the ordered phase and the magnetic properties is investigated.
CRYSTAL RESEARCH AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hasan Ahmadian Baghbaderani, Ansar Masood, Kenny L. Alvarez, Daniel Lordan, M. Venkatesan, Cian O. Mathuna, Paul McCloskey, Plamen Stamenov
Summary: In this study, the amorphisation capability of Co-Fe-B alloys fabricated by melt spinning is predicted and evaluated using liquidus temperature, mixing enthalpy, and atomic mismatch factor. The study successfully predicts five amorphous alloy compositions and finds a strong correlation between amorphisation ability and crystallisation behaviour.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Mechanics
Sruthy Poulose, Jennifer A. Quirke, Plamen Stamenov, Matthias E. Mobius, J. M. D. Coey
Summary: In this study, pendant droplets of water and paramagnetic solutions were examined in the presence of uniform and nonuniform magnetic fields. The findings showed that the surface tension of water droplets was minimally affected by a uniform magnetic field, while the magnetic field gradient was able to deform the droplets and affect their density. The dynamic measurements revealed that the magnetic field had no significant impact on the pinch-off dynamics.
Article
Physics, Applied
Jinu Kurian, Aleena Joseph, Salia Cherifi-Hertel, Ciaran Fowley, Gregor Hlawacek, Peter Dunne, Michelangelo Romeo, Gwenael Atcheson, J. M. D. Coey, Bernard Doudin
Summary: He+ ion irradiation is used to pattern multiple areas of Pt/Co/W films with different irradiation doses in Hall bars, resulting in a landscape of perpendicular magnetic anisotropy. This enables selective multilevel current-induced switching, with full control of the position and order of the individual switching elements. Key pattern design parameters are specified, offering a scalable approach for multilevel switching devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Sruthy Poulose, M. Venkatesan, Matthias Mobius, J. M. D. Coey
Summary: The evaporation rates of ortho water and para water are affected differently by a magnetic field. The evaporation rate of ortho water increases, while that of water with dissolved urea decreases. This is due to the effects of magnetic field-induced dephasing of proton precession and Lorentz stress on the moving charge dipole.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Review
Physics, Condensed Matter
Tim A. Butcher, J. M. D. Coey
Summary: This article provides an overview of the effect of a magnetic field gradient on fluids with linear magnetic susceptibilities. It shows the equivalence between the magnetic field gradient force and the concentration gradient force for paramagnetic species in solution in incompressible fluids. The magnetic field gradient and concentration gradient forces are approximations of the Kelvin force and Korteweg-Helmholtz force densities, respectively. The criterion for the appearance of magnetically induced convection is derived, and experimental work involving magnetically induced convection is reviewed.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Applied
Yangkun He, J. M. D. Coey, Zsolt Gercsi
Summary: Fully compensated ferrimagnetic half metals have attracted great attention in spintronics. Unlike previous calculations based on hypothetical ordered alloys, we investigated existing solid solution series using Co1-xCrxS2 as an example. Our calculations reveal a low-spin state for Cr, consistent with early experiments, and a fully compensated ferrimagnetic half metal with a Curie temperature above room temperature at x approximate to 0.33. This study demonstrates the method of combining two half metals with light and heavy 3d metals in a solid solution to achieve compensation, where atomic disorder does not compromise the desired properties.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
K. E. Siewierska, H. Kurt, B. Shortall, A. Jha, N. Teichert, G. Atcheson, M. Venkatesan, J. M. D. Coey, Z. Gercsi, K. Rode
Summary: The cubic Heusler alloy Ru2-xMn1+xAl, grown as a thin film on MgO and MgAl2O4 substrates, is a spin-polarised ferrimagnetic metal with weak magnetocrystalline anisotropy. Unlike Mn2RuxGa, it does not exhibit ferrimagnetic compensation or large magneto-galvanic effects, which are attributed to a combination of atomic order and hybridisation with the group 13 element Al or Ga. The spin polarisation is around 50% to 60%, with a gap in the density of states just above the Fermi level in fully ordered compounds.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Editorial Material
Physics, Multidisciplinary
Zsolt Gercsi, Yangkun He, J. M. D. Coey
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Sruthy Poulose, Yara Alvarez-Brana, Lourdes Basabel-Desmonts, Fernando Benito-Lopez, John Michael David Coey
Summary: Water evaporation is studied in confined environments, and it is found that the magnetic field has a greater effect on the evaporation rate in microchannels compared to beakers. The evaporation rate in microchannels is double that of beakers, but lower than expected for an open surface in still air. The magnetic enhancement is due to the gradient of the applied magnetic field, which affects the isomeric populations in the vapor and increases the evaporation rate.
IEEE MAGNETICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yangkun He, Simon Lenne, Zsolt Gercsi, Gwenael Atcheson, Jack O'Brien, Daniel Fruchart, Karsten Rode, J. M. D. Coey
Summary: This article investigates the spin structure of Mn4N films and its influence on the magnetotransport properties.
