Article
Chemistry, Physical
S. N. Sofronova, N. Kazak, E. Eremin, E. M. Moshkina, A. Chernyshov, A. F. Bovina
Summary: The sign reversal of both magnetization and exchange bias field was studied in polycrystalline Ni5.33Ta0.67B2O10, with different exchange bias effects observed at different temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Crystallography
Balnude Nuendute, Wuliji Hanggai, Hargen Yibole, Bao Tana, Ojiyed Tegus, Francois Guillou
Summary: This study explores the Mn(Fe, Ni)(Si, Al) series compounds and achieves a magneto-structural phase transition from ferromagnetic to paramagnetic phase in the range of 0.06 < x <= 0.08. The synthesis of high-quality samples using conventional methods is hindered by the decomposition of the compounds at intermediate temperatures.
Article
Materials Science, Ceramics
Shannon E. Murray, Yu-Ying Lin, Soumitra S. Sulekar, Mebatsion S. Gebre, Nicola H. Perry, Daniel P. Shoemaker
Summary: Reactive flash sintering is an effective method for densifying and synthesizing ceramic materials, but the predictive capability of the BBR model for phase transformations during the process is limited. CuO reduction and Mn(2)O(3) reduction demonstrate the challenges of predicting phase transformations due to local, stochastic current flow and localized heating. Understanding and engineering the complex thermal profile that results from these sources of inhomogeneity can be beneficial for optimizing reaction kinetics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Review
Biochemistry & Molecular Biology
Beata Tarnacka, Anna Jopowicz, Maria Maslinska
Summary: Copper, manganese, and iron are essential elements for appropriate brain development and function, but their imbalance can lead to various neurological conditions. This review focuses on neurological disorders associated with excess copper, iron, and manganese, and discusses the diagnosis and potential treatment of these disorders.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Inorganic & Nuclear
Yanxue Shang, Yidan Cao, Yufeng Xie, Shaowei Zhang, Peng Cheng
Summary: A 1D Mn-containing coordination polymer was prepared by hydrothermal assembly and characterized structurally. It exhibited antiferromagnetic coupling interactions among Mn ions and significant magnetocaloric effect. The compound has a unique chain structure and can further stack to produce a 3D supramolecular structure.
Article
Materials Science, Multidisciplinary
Wei Liu, Eduard Bykov, Sergey Taskaev, Mikhail Bogush, Vladimir Khovaylo, Nuno Fortunato, Alex Aubert, Hongbin Zhang, Tino Gottschall, Jochen Wosnitza, Franziska Scheibel, Konstantin Skokov, Oliver Gutfleisch
Summary: This study investigates the application of rare-earth-based Laves phases RAl2 and RNi2 in magnetocaloric hydrogen liquefaction and discovers the giant magnetocaloric effect of second-order magnetocaloric materials near the boiling point of hydrogen. Through a comprehensive literature review, the correlations between key quantities of magnetocaloric effect in a rare-earth intermetallic series are analyzed, providing guidance for material design and accelerating the discovery of magnetocaloric materials for hydrogen liquefaction.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Physical
Sujuan Wang, Qing Luo, Xiaohua Luo, Shengcan Ma, Changcai Chen, Fei Gao, Bodong Lv, Rui Zhong, Weijun Ren, Zhenchen Zhong
Summary: This study investigates the effects of Si and Cu doping on the crystal structure, magnetism, and magnetocaloric effect of EuAl4. Si doping leads to a decrease in the lattice parameter c, while Cu substitution causes an increase. Cu and Si doping enhance ferromagnetic interaction and change the direction of easy magnetization. Multiple-step metamagnetic transitions are observed in EuAl3.35Si0.65, while EuAl3.82Cu0.18 shows ferromagnetic behavior. As a result, the low-field magnetocaloric effect is significantly enhanced.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Stephan Muessig, Bjoern Kuttich, Florian Fidler, Daniel Haddad, Susanne Wintzheimer, Tobias Kraus, Karl Mandel
Summary: Controlled agglomeration of superparamagnetic iron oxide nanoparticles can rapidly switch their magnetic properties. Changes in temperature induced reversible switching of magnetic properties, with non-linear correlation between magnetization amplitude and agglomeration degree indicating the impact of agglomerates' size distribution on magnetic properties.
NANOSCALE ADVANCES
(2021)
Article
Materials Science, Ceramics
V. L. O. Freitas, S. S. Costa, C. J. Pacheco, B. P. Alho, P. O. Ribeiro, P. J. von Ranke, V. S. R. de Sousa, E. P. Nobrega
Summary: This study investigates the magnetic and magnetocaloric properties of amorphous alloys formed by the Gd55FexAl45-x series. A theoretical model based on Handrich's approximation is proposed to study the systems, aiming to understand the impact of Fe substitution for Al on magnetism and magnetocaloric effect. Through experimental and theoretical analysis, the physical mechanisms involved in the ferrimagnetic transitions of these amorphous alloys are explored.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Energy & Fuels
Wei Liu, Tino Gottschall, Franziska Scheibel, Eduard Bykov, Nuno Fortunato, Alex Aubert, Hongbin Zhang, Konstantin Skokov, Oliver Gutfleisch
Summary: Magnetocaloric hydrogen liquefaction has the potential to revolutionize the liquid hydrogen industry. Light rare-earth based materials offer a more sustainable alternative to heavy rare-earth compounds, with higher abundances and greater magnetocaloric effects in the required temperature range. By tuning the Curie temperature of light rare-earth alloys and mixing different rare-earth elements, a fully light rare-earth intermetallic series is developed, showcasing competitive maximum effects for hydrogen liquefaction compared to heavy rare-earth compounds like DyAl2.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Jyuhn-Huarng Juang, Chia-Rui Shen, Jiun-Jie Wang, Shu-Ting Wu, Sung-Han Lin, Chen-Yi Chen, Chen-Wei Kao, Chen-Ling Chen, Zei-Tsan Tsai, Yun-Ming Wang
Summary: The study successfully conjugated manganese magnetism-engineered iron oxide nanoparticles with exendin-4 to specifically detect and trace transplanted islet beta-cells by MRI. The method showed no adverse effects on cell viability and secretion, allowing for long-term monitoring of transplanted beta-cells.
Article
Chemistry, Physical
Quanyi Liu, Junfeng Wang, Huicai Xie, Qi Fu, XinQiang Gao, Zhenxing Li, JinLiang Zhao, Zhaojun Mo
Summary: A modified solid-phase reaction method was used to synthesize polycrystalline Eu3B2O6 as a novel cryogenic magnetocaloric material. The magnetocaloric effect, magnetic properties, and crystal structure of the compound were investigated. The compound undergoes a second-order magnetic-phase transition from ferromagnetic to paramagnetic at 8 K and has a hexagonal structure belonging to the R-3c space group. The compound exhibits a high magnetic entropy change, temperature averaged entropy change, and refrigeration capacity, making it a promising candidate for cryogenic magnetic refrigeration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Lei Xi, Xinqi Zheng, Yawei Gao, Jiawang Xu, Chaofan Liu, Dingsong Wang, Juping Xu, Wen Yin, Shuxian Yang, Baojie Jin, Mengyuan Zhu, Weifeng Xu, Jianxin Shen, Jingyan Zhang, He Huang, Yanfei Wu, Fei Gu, Huiyu Shi, Yixuan Tao, Shouguo Wang, Baogen Shen
Summary: A series of polycrystalline Er1-xYxCr2Si2 (0 <= x <= 0.8) samples with giant low-field magnetocaloric effect were successfully synthesized. The sample with x = 0.1 shows the best performance, with the working temperature down to 2 K. The maximum values of magnetic entropy change ((-Delta S-M)(max)) and adiabatic temperature change ((Delta T-ad)(max)) are 19.2 J kg(-1) K-1 and 4.3 K respectively. The value of (-Delta S-M)(max) is the largest ever reported for intermetallic MCE materials below 20 K.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Qizhong Zhao, Fanghua Tian, Tieyan Chang, Kaiyan Cao, Dingchen Wang, Yin Zhang, Chao Zhou, Xiaoqin Ke, Wenliang Zuo, Yu Wang, Sen Yang, Xiaoping Song
Summary: In this study, the magnetization reversal phenomenon in the Ni20Mn3B6 alloy was investigated at low applied fields, revealing two compensation temperatures. The first temperature is attributed to competition between Mn atoms at different positions, while the second arises from moment rotation to satisfy Zeeman energy. This phenomenon enables tunable switching of magnetization between positive and negative values, providing potential applications in spintronic devices and magnetic storage materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Piotr Konieczny, Robert Pelka, Emilia Kuzniak, Robert Podgajny
Summary: This study investigates the anisotropy of conventional magnetocaloric effect (MCE) and rotating magnetocaloric effect (RMCE) in a quasi-two-dimensional coordination polymer (AdeH){Cu-II[W-V(CN)(8)]}.2H(2)O with high magnetic anisotropy and topological phase transition. The highest magnetic entropy change (delta Smag) of 3.49 J K-1 kg(-1) is observed for conventional MCE in the H||c direction at mu 0|delta H|=7.0 T and a peak temperature of 37.5 K. For the rotation around the b axis by 90 from H||a* to H||c, the maximal delta Smag of 1.62 J K-1 kg (-1) is detected at mu 0H = 7.0 T and 38 K.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
Min Young Yang, Seungho Seong, Eunsook Lee, M. Ghanathe, Amit Kumar, S. M. Yusuf, Younghak Kim, J-S Kang
APPLIED PHYSICS LETTERS
(2020)
Article
Chemistry, Physical
Pramod Bhatt, Amit Kumar, C. Ritter, S. M. Yusuf
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
R. N. Bhowmik, Amit Kumar, A. K. Sinha, S. M. Yusuf
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Physics, Applied
Amit Kumar, S. K. Giri, T. K. Nath, C. Ritter, S. M. Yusuf
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Madhu Ghanathe, Amit Kumar, Ivan da Silva, S. M. Yusuf
Summary: Through detailed investigations including dc magnetization, ac susceptibility, neutron depolarization, and neutron diffraction studies, the physics of low temperature magnetic transitions in Ho3Fe5O12 have been revealed. The study showed a previously unknown sign reversal of magnetization below T-comp under low magnetic fields, as well as double compensation temperatures under moderate fields leading to double magnetization reversals. A modified Stoner-Wohlfarth model was used to explain the asymmetrical nature of the temperature dependent coercivity data around T-comp. The findings support the existence of two transitions at 138 K (T-comp) and 50 K, with evidence of a deep minimum and a broad peak, respectively.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
A. Kumar Deepak, S. M. Yusuf
Summary: The study investigated the origin of magnetization and exchange bias reversals in YbCrO3 compound at the magnetization compensation temperature, revealing the role of polarized Yb3+ and ferromagnetic Cr3+ sublattice moments in causing the sign reversal of magnetization. Interesting anomalous behaviors were observed, such as the coercive field having a minimum value at the compensation temperature and the change in exchange bias at the same temperature. The presence of these phenomena in a single-phase compound suggests potential applications in spintronic devices.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Deepak A Kumar, A. K. Bera, S. M. Yusuf
Summary: In this study, the correlations among negative magnetization (NM), exchange bias (EB), and electrical properties in La1-xPrxCrO3 compounds were investigated. The results showed a correlation between the negative polarity of magnetization and the positive polarity of EB. The lattice parameters were found to be closely related to the conductivity and compensation temperature. These findings have important implications for the development of thermomagnetic switches and thermal-assisted magnetic random access memory.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Madhu Ghanathe, Amit Kumar, M. D. Mukadam, S. M. Yusuf
Summary: This study reports experimental and theoretical investigations on the magnetization compensation phenomenon in the quaternary Heusler alloy Mn1.2Fe1.18V0.62Al. The results demonstrate that this alloy exhibits a nearly fully compensated magnetization state below 48 K. Furthermore, electronic structure calculations confirm its half-metallic nature. Such nearly compensated magnetic systems could be favorable for spintronics applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Debarati Pal, Abhineet Verma, Mohd Alam, Sambhab Dan, Amit Kumar, Seikh Mohammad Yusuf, Soma Banik, Sujay Chakravarty, Satyen Saha, Swapnil Patil, Sandip Chatterjee
Summary: Investigating materials with topological magnetic structures is important due to fundamental and technological concerns. In this study, we explored the properties of Sb1.9Fe0.1Te2.S-85(0.15) and found a unique combination of disordered glassy phases, competitive FM-AFM interactions, and nontrivial surface state. Our magneto-transport studies revealed the impact of these complicated magnetic phases on the observed anomalous Hall effect. AC susceptibility results showed a shift in freezing temperature, slower dynamics, and evidence of a cluster spin glass state in the system. Additionally, the de Haas-van Alphen (dHvA) oscillation study revealed a rich complexity in the underlying electronic structure with multiple Fermi pockets.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Condensed Matter
A. Deepak, A. Kumar, S. M. Yusuf, E. Sampathkumaran
Summary: We have provided understandings of polarity reversal of magnetization or negative magnetization (NM) in an exotic magnetic material using neutron depolarization and neutron diffraction techniques. The study reveals a total compensation of magnetization in the magnetic domains of the sample. The temperature-dependent neutron diffraction study shows the temperature dependencies of the magnetic moments of the three magnetic sublattices, and the dominance of one sublattice leads to the NM in the compound. The compound exhibits field-induced spin reorientation and finite exchange-bias below a certain temperature.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Engineering, Electrical & Electronic
Kuldeep Singh Chikara, Anup Kumar Bera, Amit Kumar, Seikh Mohammad Yusuf
Summary: The crystal structure and electrical properties of A2Cu3Ge4O12 (where A = Na, K) were investigated using neutron diffraction and electrical impedance spectroscopy. The compounds K2Cu3Ge4O12 (KCGO) and Na2Cu3Ge4O12 (NCGO) have perfect 2D and quasi-2D alkali metal ion layers, respectively. Both compounds exhibit small polaron hopping for dc conductivity, with single activation energy over the entire temperature range. The ac conductivity curves for both compounds follow Jonscher's power law.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Sudip Chakraborty, Santanu Pakhira, Anis Biswas, Yaroslav Mudryk, Amit Kumar, Bodhoday Mukherjee, Gunadhor S. Okram, Amitabh Das, Vitalij K. Pecharsky, Chandan Mazumdar
Summary: The occurrence of the spin-glass state in Heusler alloys is uncommon, especially in quaternary Heusler compounds. However, a highly disordered equiatomic quaternary Heusler compound, FeRuMnGa, has been discovered to possess a spin-glass state between the canonical spin-glass and cluster glass states. This finding is supported by magnetic, heat capacity, and neutron-diffraction studies, which uncover various intricate features of the spin-glass state in the compound. The disorder in the sample differs from the commonly observed A2- or B2-type disorder in Heusler compounds and also affects the electron transport properties, leading to semimetallic behavior and anomalous Hall effect at low temperatures.
Article
Chemistry, Physical
Debarati Pal, Abhineet Verma, Mohd Alam, Sambhab Dan, Amit Kumar, Seikh Mohammad Yusuf, Soma Banik, Sujay Chakravarty, Satyen Saha, Swapnil Patil, Sandip Chatterjee
Summary: This study investigates the impact of complicated magnetic phases on anomalous Hall effect (AHE) in Sb1.9Fe0.1Te2.85S0.15 through magneto-transport experiments. It is found that ordered glassy phases, competitive FM-AFM interactions, and nontrivial surface state coexist in this material. AC susceptibility results reveal a shift in freezing temperature with excitation frequency, and comprehensive analysis confirms slower dynamics and the formation of a cluster spin glass state. Furthermore, de Haas-van Alphen oscillation study shows variations in Fermi pocket quantity and shape with doping, indicating a rich complexity in the underlying electronic structure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Santosh Kumar Gupta, Kathi Sudarshan, Ruma Gupta, Brindaban Modak, Amit Kumar, Pampa Modak
Summary: This study investigates the symmetrical changes in perovskite structures and their effects on the photoluminescence of Eu3+. The results show that the Ruddlesden-Popper perovskite structure is more distorted compared to the conventional perovskite structure, resulting in different emission spectra of Eu3+. Moreover, the Ruddlesden-Popper perovskite structure has higher defect and oxygen vacancy concentrations, leading to better charge transfer and capacitance performance.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Madhu Ghanathe, Anup Kumar Bera, Amit Kumar, Seikh Mohammad Yusuf
Summary: The correlations between the crystal structural, magnetic, and electrical properties of Li0.5Fe2.5-xCrxO4 compounds have been investigated using neutron diffraction, DC magnetization, and impedance spectroscopy. The study reveals mixed cation distributions, ferrimagnetic ordering, and the presence of both ionic and electronic conductivities in the compounds. The relative contributions of electronic and ionic conductions are highly tunable with Cr substitution.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
