Article
Chemistry, Physical
Tai-Yue Li, Ming-Kang Ho, Tus-En Hsu, Hsin-Hao Chiu, Kuan-Ting Wu, Jen-Chih Peng, Chun-Ming Wu, Ting Shan Chan, B. Vijaya Kumar, P. Muralidhar Reddy, Shyue-Chu Ke, Chia-Liang Cheng, Ashish Chhaganlal Gandhi, Sheng Yun Wu
Summary: The study found that NiO nanoparticles exhibit similar anti-ferromagnetic spin behavior to bulk NiO, but with additional anomalies above the AF ordering temperature due to factors such as particle size distribution and weak interparticle interaction.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
N. Biniskos, F. J. dos Santos, M. dos Santos Dias, S. Raymond, K. Schmalzl, P. Steffens, J. Persson, N. Marzari, S. Bluegel, S. Lounis, T. Brueckel
Summary: In this study, we investigate the spin-excitation spectrum of bulk Mn5Si3 using inelastic neutron scattering measurements and density functional theory calculations. We find that the spin dynamics of each phase in Mn5Si3 is robust against any combination of temperature and magnetic field. The high-energy spin dynamics exhibit distinctive characteristics of either spin waves or broad fluctuation patterns in different phases.
Article
Chemistry, Inorganic & Nuclear
Langit Cahya Adi, Anas Santria, Naoto Ishikawa
Summary: The magnetic interaction between the total angular momentum (J) of the 4f electrons in a lanthanide ion and the orbital angular momentum (L) of a porphyrin in the photo-excited states of 5,10,15,20-tetraphenylporphyrinato Dy(iii) complexes capped with a crown ether with one of two different symmetries, 12-crown-4 or 1-aza-12-crown-4, was investigated through temperature- and magnetic dependent magnetic circular dichroism (VT-VH MCD). The analysis revealed that an asymmetric non-aromatic ligand resulted in an increased magnitude of the J-L interaction.
DALTON TRANSACTIONS
(2023)
Article
Physics, Applied
Mian Muhammad Azmat, Abdul Majid, Sajjad Haider, Shaukat Khan
Summary: The structural, electronic, and magnetic properties of pure and Ti doped w-AlN were investigated. It was found that Ti-Al-V-N complex in AlN is energetically favorable, possesses stable spin-triplet ground state, and shows enhanced spin polarization. The complex exhibits strong antiferromagnetic coupling.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Physics, Multidisciplinary
Hoda F. Ahmed, Marina B. Melad
Summary: Three different models, Qi model, Jiang model, and Lu model, were used to study the size and shape dependence of magnetic properties of nanomaterials. It was found that with a decrease in size, Curie temperature, magnetisation, and Neel temperature also decrease. The Qi model showed better agreement with experimental data compared to the Lu and Jiang models, indicating its validity in describing the magnetic properties of nanomaterials.
PRAMANA-JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Mohd Mawardi Saari, Mohd Herwan Sulaiman, Nurul Akmal Che Lah, Zulkifly Aziz, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Summary: This study characterizes the size distribution of magnetic cores in single- and multi-core nanoparticles in water suspension using transmission electron microscopy and static magnetization curve analysis. The magnetic moment distribution suggests a reduction in effective magnetic core size due to magnetization degradation. The AC susceptibility response of MNPs from 5 Hz to 100 kHz is also evaluated to understand the average anisotropy energy ratio.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Gheorghe Amanoloaei, Alexandru Stancu, Laurentiu Stoleriu
Summary: This numerical model of magnetization dynamics is based on the Stoner-Wohlfarth model and Landau-Lifshitz-Gilbert equation, using coefficients for interpolation of equilibrium time and a linear system of equations for angular component variation. The dynamic Stoner-Wohlfarth model is employed for accurate replication of macrospin dynamics with improved numerical efficiency under constant or variable external magnetic fields.
IEEE MAGNETICS LETTERS
(2021)
Article
Chemistry, Physical
I. I. Bulyk, V. V. Chabanenko, A. Nabialek, T. Zajarniuk, A. Szewczyk, R. Puzniak, V. V. Burkhovetskyi, V. Yu Tarenkov, J. Wrobel, I. Borukh
Summary: The relationship between phase recombination conditions and the phase content, microstructure, and magnetic properties of sintered SmCo5-based permanent magnets was investigated. It was found that by adjusting the temperature and holding time during recombination, the magnetic properties of the magnets could be improved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yevhen Zabila, Marta Marszalek, Michal Krupinski, Arkadiusz Zarzycki, Marcin Perzanowski
Summary: This study prepared semi-metallic bismuth thin films by thermal evaporation, observing stabilization of grain size at 140 nm and continuous decrease of resistivity with increasing thickness. Annealing the films at temperatures close to the melting point of Bi led to a significant increase in magnetoresistance at room temperature and in a 7T magnetic field.
Article
Chemistry, Physical
Arkadiusz Zarzycki, Juliusz Chojenka, Marcin Perzanowski, Marta Marszalek
Summary: This study explores the magnetoelectric properties of metal/metal-oxide/metal junctions based on anodized metal oxides, particularly using Ti and Fe metallic layers separated by porous metal-oxides of iron or titanium. The research finds that magnetoresistance is influenced by the junction composition, with strong interatomic diffusion at the interface between the top metallic layer and anodized oxide having the most significant impact on observed behavior.
Article
Engineering, Electrical & Electronic
Clemens Muehlenhoff, Michal Krupinski, Arkadiusz Zarzycki, Manfred Albrecht
Summary: In this study, the magnetotransport properties of Co/Pt based perpendicular synthetic antiferromagnetic (p-SAF) structures with Ru interlayers were investigated. The number of Co/Pt multilayer (ML) stacks and Ru interlayers in the p-SAF structures were varied to examine changes in their magnetoresistive effects. The alignment of magnetization directions of the MLs in the ML/Ru/ML stacks of the p-SAF generated a giant magnetoresistance effect (GMR), while the anisotropic magnetoresistance effect (AMR) at each ML further influenced the resistance of the system. The study results have important implications for understanding and application of magnetoresistive effects.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
E. E. Zubov
Summary: In the framework of the self-consistent effective field approximation of the time-dependent perturbation theory, the influence of electron tunneling on spontaneously induced order parameters in a normal metal-superconductor hybrid structure was investigated. It was found that near the critical barrier transparency, a reentrant superconductivity phenomenon can be observed. Spectral properties of the hybrid structure show the coexistence of both coherent and incoherent elementary excitations.
LOW TEMPERATURE PHYSICS
(2021)
Article
Physics, Applied
D. N. Merenkov, V. A. Bedarev, S. N. Poperezhai, Yu. A. Savina, T. Zajarniuk, A. Szewczyk
Summary: The temperature dependence of magnetic susceptibility of the ErAl3(BO3)(4) single crystal was measured, and the influence of spin-spin correlations on the magnetic susceptibility was identified.
LOW TEMPERATURE PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
M. Kac, A. Nykiel, O. Pastukh, M. Kopec, A. Zarzycki, A. Maximenko, M. Parlinska-Wojtan, E. M. Dutkiewicz, A. Kopia
Summary: This research focused on the influence of Cu addition on the structure and magnetic properties of FeCu-alloyed and Fe/Cu-multilayered nanowires. It was found that Cu addition prevents oxidation and increases magnetic anisotropy and squareness. The increase in Cu concentration in alloyed nanowires leads to higher coercivity and squareness. In the case of multilayered nanowires, increasing Cu layer thickness results in reduced squareness and non-monotonic changes in coercivity.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Physics, Applied
Y. Konopelnyk, P. Iwanowski, R. Diduszko, T. Zajarniuk, J. Fink-Finowicki, I. Radelytskyi, A. Szewczyk, H. Szymczak, M. Pekala, R. Puzniak
Summary: The influence of Co and Ni ion doping on the crystal structure, phase transitions, and magnetic properties of the Fe7Se8 system has been investigated. The results show a strong correlation between chemical and hydrostatic pressures, and the magnetocaloric parameters strongly depend on chemical pressure.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
M. Perzanowski, O. Polit, J. Chojenka, W. Sas, A. Zarzycki, M. Marszalek
Summary: In this study, the effect of laser interference patterning on the magnetic properties of Pd/CoO/Co/Pd multilayers was investigated. It was found that laser treatment caused magnetic softening of the structure edges while the centers exhibited the exchange bias effect. The study focused on the shape and configurational magnetic anisotropies induced by patterning and showed that the magnetic properties varied depending on the angle of the external magnetic field.
Article
Materials Science, Coatings & Films
Amanda Bartkowiak, Yevhen Zabila, Elzbieta Menaszek, Arkadiusz Zarzycki, Marcin Perzanowski, Marta Marszalek
Summary: In recent decades, various attempts have been made to improve the functionality, biocompatibility, and osseointegration of metallic implants. This study investigates the contribution of a protective tantalum interlayer on the growth of hydroxyapatite (HAp) crystals on titanium substrates. The researchers found that coatings with smaller diameters of HAp crystals synthesized on tantalum-based films were more favorable for cell viability and attachment.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Juliusz Chojenka, Arkadiusz Zarzycki, Marcin Perzanowski, Michal Krupinski, Tamas Fodor, Kalman Vad, Marta Marszalek
Summary: We study the magnetic properties of thin iron films on nanoporous titanium oxide templates and analyze their dependence on nanopore radius. We compare these results with a continuous iron film of the same thickness and investigate the evolution of magnetic properties after annealing. We find that the M(H) loops of the films consist of two magnetic phases from the iron layer and iron oxides formed at the titanium oxide/iron interface. Deconvolution of hysteresis loops helps extract information for each magnetic phase. We also explore the magnetic interactions between the phases and observe the magnetic hardening effect induced by the nanopores. The ZFC-FC measurements show a disordered glass state below 50 K, likely due to iron oxide formation and short-range magnetic order at the titanium oxide-iron interface.
Article
Chemistry, Physical
Arkadiusz Zarzycki, Marcin Perzanowski, Michal Krupinski, Marta Marszalek
Summary: This work presents the process of solid-state dewetting in FePd thin films and its impact on structural transformation and magnetic properties. The morphology, structure, and magnetic properties of the FePd system after annealing at 600 degrees C for different durations were investigated. The analysis revealed a strong correlation between the dewetting process and various physical phenomena, particularly the transition between the A1 phase and L1(0) phase, which is strongly influenced by and connected with solid-state dewetting.
Article
Physics, Multidisciplinary
A. A. Prokhorov, R. Minikayev, T. Zajarniuk, A. Szewczyk, J. Lancok, A. D. Prokhorov
Summary: New data on the state of Tb3+ doping ions in the EuAl3(BO3)(4) single crystals were obtained through the study of electron paramagnetic resonance spectra and optical absorption spectrums. The specific heat of the crystals was also measured and analyzed. The study showed that Tb3+ ions substitute trivalent europium ions and lower the crystal symmetry. The temperature dependence of the linewidth was found to follow the exponential function characteristic of the Aminov-Orbach processes.
ACTA PHYSICA POLONICA A
(2022)
Article
Materials Science, Multidisciplinary
I. Fita, R. Puzniak, E. E. Zubov, P. Iwanowski, A. Wisniewski
Summary: The compensated ferrimagnet orthoferrite ErFeO3 exhibits temperature-driven spin switching and exchange bias, which is manifested as the temperature shift of the hysteresis loops upon cooling and heating. The unidirectional exchange bias anisotropy is caused by the shift in the region of coexistence of negative and positive magnetization, determined by the applied magnetic field. This phenomenon is discussed within a model that explains the magnetic compensation mechanism in ErFeO3.
Article
Materials Science, Multidisciplinary
T. Zajarniuk, A. Szewczyk, P. Wisniewski, M. U. Gutowska, R. Puzniak, H. Szymczak, I Gudim, V. A. Bedarev, M. Pashchenko, P. Tomczak, W. Szuszkiewicz
Summary: The specific heat of a TbAl3(BO3)(4) crystal was studied, and a phase transition was found at low temperatures. The results showed that an increase in magnetic field can lower the transition temperature, and the specific heat and Gruneisen ratio exhibited characteristics of a quantum critical point. By constructing a phase diagram and assessing the critical exponent, the nature of the system was revealed. Magnetization studies indicated ferromagnetic ordering, but contrary to classical behavior, suggesting a dominant role of quantum fluctuations in the phase transition.
