Article
Materials Science, Multidisciplinary
Ravinder Kumar, B. Samantaray, Shubhankar Das, Kishori Lal, D. Samal, Z. Hossain
Summary: We report a strong enhancement of damping in yttrium iron garnet (YIG) film due to spin inhomogeneity at the interface. This is caused by the antiferromagnetic exchange coupling between a thin interfacial gadolinium iron garnet (GdIG) layer, induced by growth, and the top YIG layer. The large inhomogeneous distribution of the effective magnetization in the YIG film results in enhanced precessional damping.
Article
Materials Science, Ceramics
Trinh Nguyen Thi, Phuoc Cao Van, Duc Duong Viet, Viet Dong Quoc, Hayeong Ahn, Viet Anh Cao, Min-Gu Kang, Junghyo Nah, Byong-Guk Park, Jong-Ryul Jeong
Summary: The study found that using a PVP concentration of 1g in the synthesis of YIG ultrathin films resulted in the smoothest surface, optimal crystallinity, and superior morphology. This highlights the importance of film crystallinity and morphology in the spin-to-charge conversion efficiency of YIG films.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Jose Santiso, Carlos Garcia, Cristian Romanque, Loic Henry, Nicolas Bernier, Nuria Bagues, Jose Manuel Caicedo, Manuel Valvidares, Felip Sandiumenge
Summary: Yttrium iron garnet is a promising material for various applications, but its epitaxial films in the nanometer thickness range show significant variations in magnetic behavior, limiting their potential use in technological devices. In this study, the atomic structure of a nominally stoichiometric thin film was directly visualized and analyzed, revealing the presence of Y-excess octahedral antisite defects. The low occurrence of scattering centers and the suppression of magnetic moment by the defects were observed, providing insights into the magnetic properties of the thin film.
Article
Materials Science, Ceramics
Petr Tananaev, Artem Shelaev, Yevgeniy Sgibnev, Daria Kulikova, Svetlana Efremova, Artem Voennov, Alexander Baryshev
Summary: Metal organic decomposition (MOD) is a simple and inexpensive method for manufacturing optical grade polycrystalline thin films. This study presents a new MOD method and discusses a chemical route for fabricating thin porous oxide films with a thickness of more than 100 nm.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Chen Kang, Tao Wang, Changjun Jiang, Kun Chen, Guozhi Chai
Summary: This study investigated the giant magneto-impedance (GMI) effect on ferrimagnetic insulator yttrium iron garnet (YIG) films and spheres, highlighting the significant role of ferromagnetic resonance effect. The results showed distinct impedance variations in the transmission line loaded with single crystalline YIG samples depending on the external magnetic field, indicating a substantial GMI effect. The maximum GMI ratio reached 256% with a corresponding magnetic response of 8.8%/Oe, suggesting the potential use of single crystalline YIG films in chip-scale magnetic sensors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yaning Lin, Lichuan Jin, Dainan Zhang, Huaiwu Zhang, Zhiguo Wang
Summary: This study systematically examines the effects of mechanical strain on the magnetic anisotropy energy in YIG and BiYIG using density functional theory. It is found that unstrained YIG has no magnetic anisotropy, and the direction of the easy axis can be changed by strain.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
X-Y Wei, O. Alves Santos, C. H. Sumba Lusero, G. E. W. Bauer, J. Ben Youssef, B. J. van Wees
Summary: This study reports a giant magnon conductivity in thin yttrium iron garnet films. By reducing the number of occupied two-dimensional subbands from a large number to a few, a transition from three-dimensional to two-dimensional magnon transport is achieved. The high conductivity obtained offers opportunities for developing low-dissipation magnon-based spintronic devices.
Article
Chemistry, Multidisciplinary
Huajun Qin, Rasmus B. Hollander, Lukas Flajsman, Sebastiaan van Dijken
Summary: This study proposes a new waveguiding structure based on low-damping continuous YIG films, which defines nanoscopic spin-wave transporting channels within YIG by dipolar coupling to ferromagnetic metal nanostripes. The structure enables long-distance transport of spin waves with small decay length and operates at small bias field.
Article
Chemistry, Multidisciplinary
Maryam Jalali-Mousavi, Samuel Kok Suen Cheng, Jian Sheng
Summary: Synthesis of wrinkle-free and stress-free thin film in elastomer is achieved by jamming the interface with nanoparticles, which suppresses interfacial instabilities. The use of polydimethylsiloxane (PDMS) and parylene-C as a model system demonstrates the successful fabrication of large-scale (>10 cm) wrinkle-free Al film over/in PDMS. Varying the thickness of the jammer layer reveals that wrinkles are effectively suppressed when the layer exceeds a critical thickness (e.g., 150 nm). Nano-indentation experiments confirm the increased elastic behavior of the interface with respect to the jammer thickness, supporting the wrinkle suppression mechanism. The resulting film, embedded in a polymer matrix, is highly deformable, elastic, and optically smooth, making it suitable for deformable optical sensors and actuators.
Article
Physics, Multidisciplinary
Tian Ying-Yi, Wang Shuan-Hu, Luo Dian-Bing, Wei Xiang-Yang, Jin Ke-Xin
Summary: In this study, a series of BixY3-xFe5O12 films with different doping ratios were prepared by spin coating, and the effects of Bi3+ on the morphology, structure and spin transport properties of YIG films were investigated. The results showed that Bi doping does not change the crystal structure of YIG, but increases the absorption and decreases the bandgap of the films. X-ray photoelectron spectroscopy (XPS) confirmed the coexistence of Bi3+ and Bi2+. The regulation of Bi doping on spin transport was reflected in the significantly smaller magnon diffusion length of BixY3-xFe5O12 films compared to pure YIG films. Meanwhile, it was found that noticeable spin Hall magnetoresistance can still be detected in the Pt/BixY3-xFe5O12 heterostructure, and the highest amplitude was observed when x = 0.3.
ACTA PHYSICA SINICA
(2023)
Article
Materials Science, Multidisciplinary
Valentin Sakharov, Yuri Khivintsev, Sergey Vysotskii, Alexander Stognij, Yuri Filimonov, Alexandr Sadovnikov, Evgeny Beginin, Sergey Nikitov
Summary: In this study, the characteristics of spin wave excitations in corrugated YIG films were investigated using micromagnetic simulations. The influence of corrugation depth on SW dispersion, transmission, and eigenmode spectrum was shown, along with the discovery of a bandgap caused by spin-wave resonances in the sidewalls of the corrugated YIG film.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yuanjing Zhang, Qinghui Yang, Xiuting Liu, Ding Zhang, Yiheng Rao, Huaiwu Zhang
Summary: This study focuses on the PMA properties of rare-earth iron garnet thin films, specifically TmBiIG and YBiIG, revealing that TmBiIG films have better PMA and lower damping factor. As the thickness increases, PMA weakens, but remains significant for TmBiIG.
Article
Chemistry, Physical
A. Belous, A. Tovstolytkin, O. Fedorchuk, Y. Shlapa, S. Solopan, B. Khomenko
Summary: In this study, a method for synthesizing nanosize particles of Y3AlFe4O12 garnet ferrite by precipitation in aqueous solutions at constant pH has been demonstrated. It was found that the filtration coefficient is three times greater when iron and aluminum hydroxides are precipitated simultaneously compared to when all hydroxides are precipitated simultaneously. After treatment at 800 degrees C, crystalline nanoparticles with an average particle size of 60-70 nm are formed. The ceramics obtained after proper heat treatment exhibit high density and good electrophysical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
M. Wachowiak, L. Smardz
Summary: Pd/Y bilayers and Pd/Ti/Y trilayers were prepared using DC/RF magnetron sputtering in a UHV chamber. The interfaces of Pd-Y and Ti-Y were characterized using in-situ X-ray photoelectron spectroscopy (XPS), showing significant interface mixing in the Pd/Y bilayers. Further studies demonstrated that depositing an additional Ti layer between the palladium and yttrium layers can effectively reduce interface mixing, resulting in a sharp Ti-Y interface. The structure of the layers before and after hydrogenation was examined using X-ray diffraction, and the hydrogenation kinetics were studied in-situ using resistivity and optical transmittance measurements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Multidisciplinary
Akmal Z. Z. Arsad, Ahmad Wafi Mahmood Zuhdi, Noor Baa'yah Ibrahim, Mahammad A. A. Hannan
Summary: This study conducted a bibliometric analysis of highly cited papers on YIG films published between 2012 and 2022. The results indicate that research on YIG films is an expanding and developing field.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
L-A Michez, M. Petit, V Heresanu, V Le Thanh, E. Prestat, F. D'Acapito, Q. Ramasse, F. Boscherini, P. Pochet, M. Jamet
Summary: This study extensively characterizes the structural and magnetic properties of Mn5Ge3Cx films grown on Ge(111) using advanced techniques. The results show that C atoms are mainly located in octahedral voids formed by Mn atoms and the formation of Mn23C6 clusters with higher C concentration. This paper provides a complete picture of the structure of Mn5Ge3Cx in thin films, which is essential for optimizing their magnetic properties.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Lars J. Bannenberg, Herman Schreuders, Nathan van Beugen, Christy Kinane, Stephen Hall, Bernard Dam
Summary: In the future hydrogen economy, accurate, cost-efficient, and safe hydrogen sensors based on metal hydrides will be important. Alloying can tune the properties of hydrogen-sensing materials, as demonstrated by thin films of tantalum doped with ruthenium. The alloying effects include modifying the enthalpy of hydrogenation, shifting the pressure window for hydrogen absorption, and reducing the amount of hydrogen absorbed by the material, allowing for tunable sensitivity and a wide sensing range.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Matthew Rogers, Ahasan Habib, Gilberto Teobaldi, Timothy Moorsom, J. Olof Johansson, Luke Hedley, Paul S. Keatley, Robert J. Hicken, Manuel Valvidares, Pierluigi Gargiani, Nader Alosaimi, Emiliano Poli, Mannan Ali, Gavin Burnell, Bryan J. Hickey, Oscar Cespedes
Summary: The long-term future of information storage requires the use of sustainable nanomaterials in architectures operating at high frequencies. Interfaces can play a key role in this pursuit via emergent functionalities that break out from conventional operation methods. Spin-filtering effects and photocurrents are combined at metal-molecular-oxide junctions in a hybrid magneto-capacitive memory, resulting in spin-polarized charge trapping and the formation of a magnetic interface. Transient absorption spectroscopy measurements show changes in the electronic states as a function of the magnetic history of the device within picoseconds of the optical pumping. The emergence of a magnetic interface in the picosecond timescale opens new paths of research to design hybrid magneto-optic structures operating at high frequencies for sensing, computing, and information storage.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Reza J. J. Kashtiban, Christopher E. E. Patrick, Quentin Ramasse, Richard I. I. Walton, Jeremy Sloan
Summary: Halide perovskite structures formed at the quantum scale are revolutionizing optoelectronic materials design, such as solar cells and light-emitting diodes. Four sub-nanometer halide perovskite structures were successfully created inside single-walled carbon nanotubes, demonstrating unique properties and bandgap widening compared to bulk forms. These structures show promise in the development of advanced optoelectronic devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jack W. Jordan, Alexander Chernov, Graham A. Rance, E. Stephen Davies, Anabel E. Lanterna, Jesum Alves Fernandes, Alexander Gruneis, Quentin Ramasse, Graham N. Newton, Andrei N. Khlobystov
Summary: Boron nitride nanotubes (BNNTs) are highly effective nanocontainers for polyoxometalate (POM) molecules, with spontaneous encapsulation from aqueous solution and Lewis acid-base interactions likely driving the process. Extensive investigation of the guest-molecules revealed energy and electron transfer processes between BNNTs and POMs, leading to various phenomena such as quenching of BNNT photoluminescence, emergence of new photoluminescence emissions, photochromic response, and paramagnetic signals from guest-POMs. These findings provide a fresh perspective on nanoscale host-guest interactions and open pathways for harnessing the functional properties of hybrid systems.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Kenneth J. T. Livi, Mario Villalobos, Quentin Ramasse, Rik Brydson, Hugo Slavko Salazar-Rivera
Summary: The capacity for crystals to adsorb elements and molecules depends on the structures of their crystal faces and their proportions. This study reveals that the surface structure of crystal faces is influenced by surface roughness, which is the main factor controlling the absorption site density. By examining synthetic goethites with different crystal size distributions, it is found that crystal size affects their shape, atomic-scale surface roughness, and total surface site density. The results show that surface roughness increases with the size of synthetic goethites and this leads to an increase in the total site density compared to ideal smooth crystals.
Article
Chemistry, Multidisciplinary
Andrew R. McCluskey, Andrew J. Caruana, Christy J. Kinane, Alexander J. Armstrong, Thomas Arnold, Joshaniel F. K. Cooper, David L. Cortie, Arwel Hughes, Jean-Francois Moulin, Andrew R. J. Nelson, Wojciech Potrzebowski, Vladimir Starostin
Summary: Due to the availability of modern software and hardware, Bayesian analysis is gaining popularity in neutron and X-ray reflectometry analysis. However, inconsistencies in the representation of probability distributions central to Bayesian methods in the literature may hinder the understandability and replicability of these analyses. In this article, advice is provided on how to report the results of Bayesian analysis in neutron and X-ray reflectometry, with a focus on clear reporting of initial starting conditions, prior probabilities, analysis results, and posterior probabilities. It is believed that this advice, based on the authors' experience, will enhance analytical reproducibility and improve the quality and usability of reflectometry results.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Engineering, Electrical & Electronic
Peng Chen, Qi Yao, Junqi Xu, Qiang Sun, Alexander J. Grutter, Patrick Quarterman, Purnima P. Balakrishnan, Christy J. Kinane, Andrew J. Caruana, Sean Langridge, Ang Li, Barat Achinuq, Emily Heppell, Yuchen Ji, Shanshan Liu, Baoshan Cui, Jiuming Liu, Puyang Huang, Zhongkai Liu, Guoqiang Yu, Faxian Xiu, Thorsten Hesjedal, Jin Zou, Xiaodong Han, Haijun Zhang, Yumeng Yang, Xufeng Kou
Summary: Intercalating ferromagnetic MnTe layers into the framework of MnBi2Te4 can create ferromagnet-intercalated MnBi2Te4 superlattices with tunable magnetic exchange interactions. By using molecular beam epitaxy, we have created [(MBT)(MnTe)(m)](N) superlattices and investigated their magnetic interaction properties using polarized neutron reflectometry and magnetoresistance measurements. The incorporation of ferromagnetic spacers adjusts the antiferromagnetic interlayer coupling of the MnBi2Te4 layers through the exchange-spring effect at MnBi2Te4/MnTe hetero-interfaces. The thickness of MnTe can be used to modulate the relative strengths of the ferromagnetic and antiferromagnetic order, and the superlattice periodicity can tailor the spin configurations of the synthesized multilayers.
NATURE ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Razan O. M. Aboljadayel, Christy J. Kinane, Carlos A. F. Vaz, David M. Love, Robert S. Weatherup, Philipp Braeuninger-Weimer, Marie-Blandine Martin, Adrian Ionescu, Andrew J. Caruana, Timothy R. Charlton, Justin Llandro, Pedro M. S. Monteiro, Crispin H. W. Barnes, Stephan Hofmann, Sean Langridge
Summary: We measured the induced magnetic moment in CVD-grown epitaxial and rotated-domain graphene near a ferromagnetic Ni film using PNR and XMCD. XMCD spectra at the C K-edge confirmed the presence of a magnetic signal in the graphene layer, and analysis gave a magnetic moment of approximately 0.47 mu B/C atom induced in the graphene layer. PNR measurements provided a more precise estimation, showing an induced magnetic moment of approximately 0.41 mu B/C atom at 10 K for both epitaxial and rotated-domain graphene. Additional PNR measurements on graphene grown on a nonmagnetic Ni9Mo1 substrate indicated that the induced magnetic moment is due to the opening of the graphene's Dirac cone caused by C pz-3d hybridization.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Andrew Kerr, Satu Hakkinen, Stephen C. L. Hall, Paul Kirkman, Paul O'Hora, Timothy Smith, Christian J. Kinane, Andrew Caruana, Sebastien Perrier
Summary: Surface-tethered polymers have been evaluated as friction modifier additives in oil, and important structure-property relationships for this application have been revealed. The experimental results showed that these polymers can significantly reduce friction coefficient at low treatment rates.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Shihao Wang, Yun Wang, Quentin M. Ramasse, Rainer Schmid-Fetzer, Zhongyun Fan
Summary: In this study, the segregation of yttrium (Y) at interfaces between native MgO particles and Mg in an Mg-0.5Y alloy was investigated using state-of-the-art aberration-corrected STEM and associated spectroscopy. Two different 2-dimensional compounds (2DCs) were discovered at the Mg/{111}MgO interface and the Mg/{100}MgO interface, including two atomic layers of a face-centered cubic Y2O3 phase and an Mg(Y)-O monolayer that perfectly matched the {100}MgO plane, respectively. The formation mechanisms of the 2DCs, their effects on the nucleation potency of MgO particles, and grain refinement were discussed.
Article
Physics, Applied
O. Inyang, C. Swindells, D. Rianto, L. Bouchenoire, R. J. H. Morris, A. Merkulov, A. Caruana, C. Kinane, T. P. A. Hase, D. Atkinson
Summary: This study investigated the elemental distribution of rare earth-transition metal ferrimagnetic alloys and the spatial variations of magnetization within thin films. The results showed significant variations in the distribution of transition metal and rare earth elements, which could impact the application of these alloys in spintronics.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Razan Omar M. Aboljadayel, Christy John Kinane, Carlos Antonio Fernandes Vaz, David Michael Love, Marie-Blandine Martin, Andrea Cabrero-Vilatela, Philipp Braeuninger-Weimer, Adrian Ionescu, Andrew John Caruana, Timothy Randall Charlton, Justin Llandro, Pedro Manuel da Silva Monteiro, Crispin Henry William Barnes, Stephan Hofmann, Sean Langridge
Summary: In this paper, the induced magnetic moment in graphene grown on a cobalt film was determined using polarised neutron reflectivity (PNR) and X-ray magnetic circular dichroism (XMCD) techniques. The results show that the magnetic moment in graphene is influenced by the magnetic moment in cobalt and lattice mismatch.
