Article
Materials Science, Multidisciplinary
Feng Ye, Zachary Morgan, Wei Tian, Songxue Chi, Xiaoping Wang, Michael E. Manley, David Parker, Mojammel A. Khan, J. F. Mitchell, Randy S. Fishman
Summary: Various methods including single-crystal neutron diffraction, inelastic neutron scattering, bulk magnetization measurements, and first-principles calculations were used to investigate the magnetic properties of the honeycomb lattice Tb2Ir3Ga9. The compound exhibits a unique magnetic structure with long-range magnetic interactions and a significant interplane coupling at larger distances.
Article
Chemistry, Inorganic & Nuclear
Firas F. Awwadi, Manal I. Alwahsh, Mark M. Turnbull, Christopher P. Landee, Brendan Twamley
Summary: Two isomorphous copper complexes were prepared using 2-iodopyridine and either Cl or Br, forming a magnetic chain structure based on halide exchange. Antiferromagnetic exchange was observed along the chain, with stronger exchange in the bromide complex. The low temperature structures showed unique magnetic behavior, with negative thermal expansion of covalent bonds.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
J. C. Moreno H, R. Ponce-Perez, Gregorio H. Cocoletzi, Noboru Takeuchi
Summary: Spin polarized first principles calculations were used to study the properties of MnN deposited on the CrN surface. Results suggest a transition of Mn from paramagnetic to ferromagnetic, with the first layer of CrN switching from antiferromagnetic to ferromagnetic alignment. This work identifies a potential antiferromagnetic system for spintronics applications.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Jing Ming Liang, Xu Wen Zhao, Sheung Mei Ng, Hon Fai Wong, Yu Kuai Liu, Chee Leung Mak, Chi Wah Leung
Summary: We report a study on the interfacial antiferromagnetic coupling between ferrimagnetic TbIG/YIG thin films. The temperature and directional dependences of the antiferromagnetic coupling effect are observed at low temperatures. This work enriches the magnetic research of ferrimagnetic oxide films with complex structures and provides new ideas for the design of antiferromagnetically coupled spintronics devices.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Materials Science, Multidisciplinary
V. Sahoo, R. N. Bhowmik, S. A. Khan
Summary: The Co and Ti ions were co-doped into the Fe3+ ion sites of the alpha-Fe2O3 structure using mechanical alloying and post heat treatment. The ratio of Co and Ti ions was maintained at 50:50 to compensate for charge imbalance. X-ray diffraction and Raman spectra confirmed the formation of hematite structure as the major phase. X-ray photoelectron spectra provided useful information about the chemical environment and charge state of the metal ions. The presence of mixed valence charge states indicated increased covalent character of metal-oxygen bonds. This study presents detailed information about lattice structure, composition, charge state, and various properties.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Reza Zamani Kouhpanji, Joseph Um, Bethanie Stadler
Summary: This study developed 23 new unique magnetic nanobarcodes signatures by tailoring the remanence spectra of magnetic nanowires. Design rules for generating diverse codes and a simple decoding algorithm were established. The combination of remanence spectra and decoding algorithm enabled successful identification of different nanobarcodes combinations, demonstrating a promising path for expandable encoding and reliable decoding of MNWs.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Physics, Condensed Matter
Muhammad Junaid, Jolly Jacob, Mubashar Nadeem, Nadia Jabbar, Muhammad Azhar Khan, Alina Manzoor, Adeel Hussain Chughtai, A. Ali, K. Mahmood, S. Hussain
Summary: Soft magnetic oxides of Dy-Ni substituted Mn1-xNixFe2-yDyyO4 were synthesized using a controlled micro-emulsion method, confirming their spinel structure and showing a decrease in crystallite size and an increase in lattice constant. FTIR bands indicated the spinel structure, while dielectric constant and loss decreased with frequency.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
Yujun Zhang, Jiahui Chen, Keisuke Ikeda, Kohei Yamagami, Yue Wang, Yongseong Choi, Akira Yasui, Jing Ma, Yuanhua Lin, Cewen Nan, Hiroki Wadati
Summary: In this study, the magnetism and electronic structure changes across the AFM-FM transition of Ni-doped FeRh epitaxial thin films were investigated using XMCD and HAXPES techniques. The results showed that the remnant FM phase at low temperature possesses a smaller Rh moment than the normal FM phase, while an increase of Rh 4d density of state at the Fermi level and a possible well-screened Ni 2p state were found in the FM phase. In addition, the FM fluctuation of the inter-site Fe-Fe exchange coupling within the AFM phase was observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Condensed Matter
H. Kerrai, N. Zaim, M. Kerouad, A. Zaim
Summary: The hysteresis properties and phase diagrams of a ternary nanowire are studied using Monte Carlo simulation. The effects of exchange interactions and crystal fields on the phase diagrams are examined for different thicknesses of the system. Multiple hysteresis loops are observed in the system and are consistent with previous studies.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Prithwijit Mandal, Shashank Kumar Ojha, Duo Wang, Ranjan Kumar Patel, Siddharth Kumar, Jyotirmay Maity, Zhan Zhang, Hua Zhou, Christoph Klewe, Padraic Shafer, Biplab Sanyal, Srimanta Middey
Summary: The shape of the electron cloud, known as the orbital, often has a strong influence on various exotic phenomena in solid-state systems. In this study, the observation of antiferromagnetism in the RETiO3 series has posed a puzzle, as the spin-orbital superexchange model predicts ferromagnetism in an orbitally degenerate d1 system. Additionally, the existence of orbitally ordered versus orbital liquid phase has been unsettled. The investigation of PrTiO3 single crystalline film reveals that orthorhombic distortion is the driving force for the orbital ordering of antiferromagnetic RETiO3.
Article
Materials Science, Multidisciplinary
Rafaela F. S. Penacchio, Celso Fornari, Yori G. Camillo, Philipp Kagerer, Sebastian Buchberger, Martin Kamp, Hendrik Bentmann, Friedrich Reinert, Sergio L. Morelhao
Summary: Van der Waals (vdW) materials play a fundamental role in emerging technologies such as spintronics and quantum information processing. This study describes a statistical modeling method for simulating X-ray diffraction in disordered materials, which is essential for controlling the epitaxial growth of topological insulators with intrinsic magnetic properties.
Article
Chemistry, Physical
Eduard Monaico, Vadim Morari, Maksim Kutuzau, Veaceslav V. Ursaki, Kornelius Nielsch, Ion M. Tiginyanu
Summary: Uniform nanogranular NiFe layers with different Ni contents were fabricated through electroplating on planar substrates and arrays of nanowires. The magnetic properties of these layers were analyzed to evaluate their potential applications.
Article
Physics, Applied
Fabian Samad, Gregor Hlawacek, Sri Sai Phani Kanth Arekapudi, Xiaomo Xu, Leopold Koch, Miriam Lenz, Olav Hellwig
Summary: By irradiating SAF with a low-energy He+ focused ion beam, it is possible to achieve a depth-dependent reduction in IEC and anisotropy, resulting in a specific field reversal sequence and the creation of AF domains in the irradiated regions.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Robert M. M. Klaes, Reza Loloee, Norman O. O. Birge
Summary: Josephson junctions containing magnetic materials have potential applications in superconducting electronics and memory. A memory cell design utilizing an S/F/F'/S spin valve with different switching fields in the ferromagnetic layers (F, F') can be made more robust by pinning the hard layer with an adjacent antiferromagnetic (AF) layer through exchange bias. In this study, we investigate the magnetic properties of NiFe/NiMn and Ni/NiMn bilayer sheet films to confirm the pinning behavior of Ni41Mn59. We also fabricate and measure S/N/AF/N/S Josephson junctions using NiMn as the AF layer, Nb as the S layer, and Cu as the N layer, and determine the characteristic supercurrent decay length within NiMn to be 1.0 nm through critical current measurements.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Physics, Applied
X. B. Guo, Y. P. Jiang, X. L. Lu, X. G. Tang, Z. H. Tang, Q. X. Liu, W. H. Li, Y. L. Zuo, L. Xi
Summary: Epitaxial FeSi film on MgO(001) substrate was fabricated using radio frequency magnetron sputtering technology, and its epitaxial relationship and magnetic properties were characterized through various measurements. The results revealed that the FeSi film exhibited different magnetic properties in different directions, which was attributed to crystallographic defects-induced two-magnon scattering contributions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Tahta Amrillah, Daichi Oka, Hirokazu Shimizu, Satoshi Sasaki, Daichi Saito, Kenichi Kaminaga, Tomoteru Fukumura
Summary: In this study, a rock salt-type HoO epitaxial thin film was successfully synthesized, which exhibited nontrivial magnetic structure and tunable electrical conduction. Comparing to other related materials, HoO thin film had a higher Curie temperature and showed metamagnetic behavior.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Kyohei Terakado, Hideyuki Kawasoko, Tomoteru Fukumura
Summary: In Y2O2Bi with Bi square net, higher superconducting transition temperatures (T-c) were achieved through H substitution and Li intercalation, while lower T-c was observed with F substitution. Li intercalated Y2O2Bi showed a higher T-c compared to previously reported Y2O2Bi samples with similar c/a.
DALTON TRANSACTIONS
(2022)
Article
Physics, Applied
Suguri Uchida, Takuto Soma, Miho Kitamura, Hiroshi Kumigashira, Akira Ohtomo
Summary: This study reports the growth of SnO films on specific substrates and demonstrates the significant impact of surface treatment on optical transparency, resulting in enhanced visible transmittance of the films. This enhancement is attributed to the suppression of midgap states near the film surface.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Takayuki Makino, Subaru Yusa, Daichi Oka, Tomoteru Fukumura
Summary: We determined the complex dielectric functions of epsilon-Ga2O3 and analyzed its temperature dependence. The phonon-related properties of epsilon-Ga2O3 were found to be different from those of other element and binary semiconductors.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Yongbing Shen, Mengxing Cui, Shinya Takaishi, Hideyuki Kawasoko, Kunihisa Sugimoto, Takao Tsumuraya, Akihiro Otsuka, Eunsang Kwon, Takefumi Yoshida, Norihisa Hoshino, Kazuhiko Kawachi, Yasuhiko Kasama, Tomoyuki Akutagawa, Tomoteru Fukumura, Masahiro Yamashita
Summary: In this study, a conductive and magnetically frustrated metal-fullerene-bonded framework was prepared by bonding lithium-ion-encapsulated fullerenes to a metal complex. The results showed that the compound exhibits potential S = 1/2 quantum spin liquid properties.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Shuxin Zhang, Tatsuya Yajima, Takuto Soma, Akira Ohtomo
Summary: In this study, two polymorphs of MoO3 were epitaxially grown on the (100) plane of cubic perovskites using pulsed-laser deposition. The impacts of Li-ion intercalation on each phase were investigated through electrochemical testing. The alpha-MoO3 films transformed to an amorphous phase after a single electrochemical cycle, while the beta-MoO3 films showed reversible cyclic voltammogram against repeated electrochemical cycles.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Inorganic & Nuclear
Zaichun Sun, Shaoyong Qin, Daichi Oka, Huijuan Zhang, Tomoteru Fukumura, Yuji Matsumoto, Bingchu Mei
Summary: Semitransparent and homogeneous bismuth oxychloride (BiOCl) thin films with (001) preferred orientation were synthesized on polycrystalline Sn:In2O3-glass substrates by mist chemical vapor deposition. The films showed photocathodic activity even under near-ultraviolet light within the band gap due to the in-gap states induced by oxygen vacancies. Higher synthesis temperatures resulted in a significant increase of photocurrent density under ultraviolet light. The longer lifetime of photocarriers led to an increase of internal quantum efficiency, while the larger band-edge absorption significantly contributed to the higher external quantum efficiency.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Kota Matsumoto, Hideyuki Kawasoko, Eiji Nishibori, Tomoteru Fukumura
Summary: A reversible switching of room-temperature electrical resistivity was demonstrated in a layered nickelate Sr2.5Bi0.5NiO5, which undergoes unique crystalline phase changes between different structures. This phenomenon has not been reported in transition metal oxides despite their extensive studies on electrical conduction.
Article
Chemistry, Inorganic & Nuclear
Sailaja S. Sunkari, Abhineet Verma, Om Pandey, Shraddha Gupta, Masanori Wakizaka, Shinya Takaishi, Hideyuki Kawasoko, Tomoteru Fukumura, Masahiro Yamashita
Summary: The first slow magnetic relaxation in a ferromagnetic Cu(II) chain compound, Cu(dipic)(OH2)(2), induced by a phonon bottleneck effect under a magnetic field of 0.6 T, with a relaxation time of 2.2 s at 2.8 K, was observed.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Jiyang Huang, Daichi Oka, Yasushi Hirose, Masamichi Negishi, Tomoteru Fukumura
Summary: We grew thin films of Ti0.95Co0.05O2-δ, a room-temperature ferromagnetic semiconductor, on rigid and flexible glass substrates using TiO2 seed layers. The thin films exhibited a preferred (101) orientation and large crystallographic domains of around 50 μm in lateral size, showing clear ferromagnetic hysteresis loops at 300 K. The films also had high electrical conductivity and transparency, allowing for electrical and optical detection of the ferromagnetic signal through the anomalous Hall effect and magneto-optical effect, respectively. Interestingly, flatter films with larger domains were obtained on flexible glass substrates, leading to higher conductivity and larger anomalous Hall signals comparable to epitaxial thin films.
Article
Materials Science, Multidisciplinary
Taiki Taguchi, Katsuaki Sugawara, Hirofumi Oka, Tappei Kawakami, Yasuaki Saruta, Takemi Kato, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, Takafumi Sato
Summary: We discovered that monolayer 1T-NbTe2 is a new class of two-dimensional transition-metal dichalcogenide (TMD) with a star-of-David lattice similar to bulk TaS2 and isostructural monolayer NbSe2. It exhibits a metallic ground state characterized by the sparsely occupied star-of-David lattice with a lattice periodicity of (19x19). By using various techniques, we found that the hidden Fermi-surface nesting and associated CDW formation are the primary causes for this unique correlated metallic state without a Mott gap.
Article
Chemistry, Inorganic & Nuclear
Satoshi Sasaki, Daichi Oka, Kenichi Kaminaga, Daichi Saito, Taku Yamamoto, Nobuto Abe, Hirokazu Shimizu, Tomoteru Fukumura
Summary: This study reports a solid phase rock-salt structured TbO with an unusual valence state of Tb2+. The TbO exhibits narrow gap ferromagnetic semiconductor properties and a high Curie temperature. The experimental results suggest the formation of both 4f and 5d magnetic sublattices at a single magnetic Tb2+ site in TbO.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Nobuto Abe, Daichi Oka, Kenichi Kaminaga, Daisuke Shiga, Daichi Saito, Taku Yamamoto, Noriaki Kimura, Hiroshi Kumigashira, Tomoteru Fukumura
Summary: Rocksalt CeO (001) epitaxial thin films were synthesized and their electronic properties were investigated. The study confirmed a simple 4 f15d1 electronic configuration and 4 f-5d hybridization in CeO. The results suggested that the significant 4 f-5d hybridization induced a Kondo coherent state in CeO. These findings are important for understanding the electronic behavior of CeO.
Article
Materials Science, Multidisciplinary
Takuto Soma, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo
Summary: The oxide superconductor Li1-xNbO2, with two-dimensional NbO2 layers, exhibits 2D superconductivity and large anisotropy in the upper critical field. The temperature-independent anisotropy suggests single-band superconductivity, which is different from other materials with similar structures. The study also reveals a narrow and correlated single band in the 2D NbO2 layers of Li1-xNbO2, similar to the superconductivity in cuprates.
Article
Materials Science, Multidisciplinary
Hirokazu Shimizu, Daichi Oka, Kenichi Kaminaga, Daichi Saito, Taku Yamamoto, Nobuto Abe, Noriaki Kimura, Daisuke Shiga, Hiroshi Kumigashira, Tomoteru Fukumura
Summary: A unique praseodymium monoxide PrO in the form of an epitaxial thin film has been synthesized. The PrO thin films, with a rocksalt structure and a 4f(2)5d(1) electronic configuration, exhibit metallic conduction and a local resistivity minimum at 7 K due to the Kondo effect. In contrast to other praseodymium monochalcogenides, PrO displays weak ferromagnetism below 28 K, which transitions to a more ferromagnetic-like phase around 5 K. The weak ferromagnetism is likely a result of enhanced 4f-4f exchange interaction due to the short Pr-Pr distance. In the ferromagnetic-like phase below 5 K, the magnetic hysteresis of the anomalous Hall effect is significantly larger than that of magnetization, possibly due to competing magnetic ordering.
