Article
Polymer Science
Lei Sun, Dan Lv, Yi Yang, Wei Wang, Zhong-yue Gao, Jia Bao
Summary: By utilizing Monte Carlo simulation, the magnetic properties and magnetocaloric effect of a ferromagnetic Janus particle with mixed spins (1/2, 1, 3/2) were systematically examined. It was observed that the maximum values of the isothermal magnetic entropy change and adiabatic temperature change increase as the exchange couplings decrease or the external magnetic field increases.
Article
Materials Science, Multidisciplinary
Hung Ba Tran, Hiroyoshi Momida, Yu-ichiro Matsushita, Koun Shirai, Tamio Oguchi
Summary: This study investigates the temperature dependence of magnetocrystalline anisotropy energy in CrI3 and its effect on the thermodynamic properties. The research successfully reproduces the negative sign of the isothermal magnetic entropy changes and reveals the role of anisotropic magnetic susceptibility and magnetization anisotropy. The findings shed light on the connection between magnetic field direction, entropy change, and free energy difference in CrI3.
Article
Materials Science, Multidisciplinary
Hung Ba Tran, Tetsuya Fukushima, Hiroyoshi Momida, Kazunori Sato, Yukihiro Makino, Tamio Oguchi
Summary: The recent discovery of the rotating magnetocaloric effect in rare-earth and transition metal compounds has potential applications for the next generation of fast-operating and compact cooling devices. This phenomenon has been studied in MnP, with theoretical predictions of significant rotating magnetic entropy changes in the material.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Hung Ba Tran, Tetsuya Fukushima, Kazunori Sato, Yukihiro Makino, Tamio Oguchi
Summary: The study proposed a new model and scheme to investigate the magnetocaloric properties of Mn1-xCuxCoGe alloy, and found that the enhancement of magnetostructural coupling significantly affects the isothermal magnetic entropy change, depending on the conditions of magnetic phase transition temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
M. Zaim, M. Tarnaoui, M. Kerouad, A. Zaim
Summary: The study uses Monte Carlo simulation to investigate the magnetic and magnetocaloric properties of a binary alloy ferromagnetic and ferrimagnetic single nanoparticle, revealing a second order magnetic phase transition near critical temperature and an increase in maximum isothermal magnetic entropy change with applied magnetic field.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Physics, Condensed Matter
Lei Sun, Wei Wang, Cong Liu, Bing-hui Xu, Dan Lv, Zhong-yue Gao
Summary: The influence of exchange couplings and the applied magnetic field on the magnetic behaviors and magnetocaloric effect of a ferromagnetic mixed-spin nano-graphene bilayer was investigated using Monte Carlo simulation. It was found that magnetic behaviors can be enhanced by increasing exchange couplings and the applied magnetic field. The maximum values of magnetic entropy change and adiabatic temperature change were found to increase near the critical temperature, with values increasing as exchange couplings decrease or applied magnetic field increases.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Chemistry, Physical
Jiayu Zhang, Jian Wang, Chenyu Zhang, Zongbin Li, Juan Du, Yong Hu
Summary: By modulating the exchange interaction, a magnetic-to-thermal energy conversion can be achieved, reducing the influence of magnetic field on increment of magnetic entropy and enabling magnetically stabilized self-converted refrigerants.
Article
Physics, Multidisciplinary
W. C. Li, Z. Q. Liu, J. Y. Chen, D. Xie, X. W. Yao, Z. X. Deng
Summary: In this study, the effect of uniaxial stress on the stability of magnetic skyrmions is investigated using Monte Carlo simulations. The results show that uniaxial stress can stabilize the skyrmion phase.
Article
Chemistry, Multidisciplinary
Jia-Jia Yin, Tian-Qi Lu, Cheng Chen, Hai-Yan Shi, Gui-Lin Zhuang, Jun Zheng, Xiaolong Fang, Xiu-Ying Zheng
Summary: Two dimeric Ln-Cr clusters were synthesized using a ligand-controlled hydrolytic method, revealing their core structures through single crystal structure analysis. Compound 1 forms a three-dimensional framework with a one-dimensional nanopore channel, while compound 2 displays frequency-dependency under a direct current magnetic field of 2000 Oe.
Article
Physics, Applied
Jiayu Zhang, Yong Hu
Summary: The role of magnetocrystalline anisotropy in single crystals on the anisotropic magnetocaloric effect was studied using Monte Carlo simulation. The study found that anisotropy can affect the spin reorientation transition temperature and the magnetization behavior at low temperatures and weak fields. Additionally, the anisotropy of entropy change is most significant when the magnetic field is parallel to the easy axis.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
M. Anas, Sarita Rajput, Ankita Singh, Rinku Kumar, T. Maitra, V. K. Malik
Summary: The magnetic and magnetocaloric properties of Nd0.5Dy0.5CrO3 have been studied. The Cr3+ magnetic moments exhibit an antiferromagnetic ordering below 180 K and a spin reorientation at around 60 K. Negative magnetization is observed below 5 K. The maximum magnetic entropy change is found to be 8.71 J kg(-1) K-1 at 7.3 K and 10 T. The experimentally obtained values are in agreement with the theoretically calculated values.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
R. Martinho Vieira, O. Eriksson, T. Bjorkman, A. Bergman, H. C. Herper
Summary: The study presents an efficient computational approach for evaluating the entropy change of magnetocaloric materials, with a focus on hcp Gd. It demonstrates the importance of the mixed-scheme for magnetic Monte Carlo simulations and highlights the dominant contribution of magnetism to the entropy change. The calculated total entropy change is in agreement with experimental measurements at room temperature.
MATERIALS RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
M. Marchwiany, M. Matysiak, A. Majhofer, J. Szczytko, A. Twardowski
Summary: Monte Carlo techniques are used to simulate the magnetic properties of chains of identical, spherical, single domain, ferromagnetic nanoparticles with cubic magnetocrystalline anisotropy. The simulations include hysteresis curves, zero field cooled (ZFC) and field cooled (FC) experiments for chains of varying lengths. Anisotropic dipole-dipole interactions between particles lead to differences in the system's response to magnetic fields parallel and perpendicular to the chain, resulting in wasp-waisted hysteresis loops. The study compares chains with different particle sizes to understand the quantitative scale of the phenomena discussed.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Y. El Krimi, R. Masrour, A. Jabar
Summary: The Co2CrGa structure was optimized using density functional theory with GGA-PBE, showing stability in the L2(1) phase and exhibiting half-metallic character with an indirect gap. The system was found to have interesting physical properties for thermoelectric applications and magnetic refrigeration, making it a potential candidate for further study.
MATERIALS TODAY ENERGY
(2021)
Article
Physics, Multidisciplinary
Tushar Kanti Bhowmik
Summary: Through Monte Carlo simulation, the detailed magnetic properties and critical behavior of LaMn2Si2 were studied, with the critical temperature and key parameters determined. Adding copper element reduced the critical temperature of LaMn2Si2 and studied the magnetocaloric effect. This compound is a suitable candidate for a room temperature magnetic refrigerator.
Article
Physics, Multidisciplinary
Daniel Failde, Daniel Baldomir
Summary: Topological insulators exhibit axion electrodynamics instead of the usual Maxwell equations, leading to unique behaviors in electric and magnetic fields. The research shows that the topological electric and magnetic fields only affect the surface, while the scalar axion behaves like a real Klein-Gordon field throughout the topological insulator. This opens up the possibility of experimental testing of axion electrodynamics in topological insulators.
ANNALEN DER PHYSIK
(2022)
Article
Chemistry, Multidisciplinary
Pelayo Garcia Acevedo, Manuel A. Gonzalez Gomez, Angela Arnosa Prieto, Jose S. Garitaonandia, Yolanda Pineiro, Jose Rivas
Summary: In this study, the synthesis and study of iron-oxide-based hollow MNPs and their precursors were conducted to investigate the mechanisms involved in exchange bias generation. The effects of external parameters on the properties of hollow MNPs were also examined. The presence of surface spins was proven to be crucial for exchange bias generation.
Article
Chemistry, Physical
M. Varga, L. Galdun, B. Kunca, V. Vega, J. Garcia, V. M. Prida, E. D. Barriga-Castro, C. Luna, P. Diko, K. Saksl, R. Varga
Summary: This study presents the magnetic characterization of ferromagnetic Ni-Fe-Ga shape memory nanowires using temperature-dependent FORC analysis. The FORC analysis confirms the uniform and homogeneous nature of the nanowires array and supports the ferromagnetic shape memory behavior and structural transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Pelayo Garcia Acevedo, Manuel A. Gonzalez Gomez, Angela Arnosa Prieto, Lisandra De Castro Alves, Roman Seco Gudina, Yolanda Pineiro, Jose Rivas
Summary: Iron oxide magnetic nanoparticles (MNPs) were synthesized with different single-core and multi-core structures, and functionalized with organic and inorganic coating materials for applications in cell biotechnological procedures. MNPs exhibited potential as transfection and imaging agents, and multi-core MNPs showed promise as efficient nanoheaters for magnetic hyperthermia applications. The study highlighted the versatile capabilities of MNPs when used in conjunction with external magnetic fields in various biomedical approaches.
Article
Biochemistry & Molecular Biology
Melania Maglio, Maria Sartori, Alessandro Gambardella, Tatiana Shelyakova, Valentin Alek Dediu, Matteo Santin, Yolanda Pineiro, Manuel Banobre Lopez, Jose Rivas, Anna Tampieri, Simone Sprio, Lucia Martini, Alessandro Gatti, Alessandro Russo, Gianluca Giavaresi, Milena Fini
Summary: The use of functionalized scaffolds incorporated with superparamagnetic nanoparticles and vascular endothelial growth factor (VEGF) injection into a magnetic scaffold resulted in increased bone regeneration in a large bone defect in sheep metatarsus. The magnetic field generated by implanted magnets allowed the capture of the injected nanoparticles, forming a VEGF gradient in the scaffold's porosity. Histomorphometric measurements showed improved bone growth and bone-to-implant contact, while atomic force microscopy (AFM) analysis revealed similar nanomechanical behavior of the regenerated tissue to the magnetic field distribution. This study demonstrates the potential of magnetic technologies combined with functionalized scaffolds to enhance bone formation and improve bone/scaffold interaction.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Javier Garcia, Ruth Gutierrez, Ana S. Gonzalez, Ana I. Jimenez-Ramirez, Yolanda Alvarez, Victor Vega, Heiko Reith, Karin Leistner, Carlos Luna, Kornelius Nielsch, Victor M. Prida
Summary: Tuning and controlling the magnetic properties of nanomaterials is crucial for implementing new technologies. In this study, core/shell Ni@(NiO, Ni(OH)2) nanowire arrays were fabricated using an electrochemical approach, and their magnetic properties were characterized. The results showed surface oxidation-induced magnetic hardening in the nanowires and an increasing exchange bias effect at low temperatures.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Analytical
Ana Laura Cuevas, Victor Vega, Antonia Dominguez, Ana Silvia Gonzalez, Victor M. Prida, Juana Benavente
Summary: Optical characterization of nanoporous alumina-based structures was performed using spectroscopic ellipsometry and photoluminescence spectra. The results showed the dependence of refractive index and extinction coefficient on wavelength, as well as the influence of sample geometry and cover-layer material. Photoluminescence curves exhibited similar shapes but different intensity values. This study highlights the potential applications of these structures in nanophotonics, optical sensing, or biosensing.
Article
Cell Biology
Susanna Kemppainen, Nadine Huber, Roosa-Maria Willman, Ana Zamora, Petra Makinen, Henna Martiskainen, Mari Takalo, Annakaisa Haapasalo, Tomas Sobrino, Manuel Antonio Gonzalez Gomez, Yolanda Pineiro, Jose Rivas, Uwe Himmelreich, Mikko Hiltunen
Summary: Organotypic slice culture models, especially those derived from adult tissue, provide a valuable tool for studying neurodegenerative diseases such as tauopathies. In this study, hippocampal slice cultures from adult transgenic mice were used to investigate the effects of a novel antibody on hyperphosphorylated TAU. The adult-originating slices retained key cellular components and exhibited tau pathology, making them a suitable model for studying TAU pathology in the adult brain without the interference of the blood-brain barrier.
Article
Chemistry, Inorganic & Nuclear
Manuel A. Gonzalez-Gomez, Roman Seco-Gudina, Pelayo Garcia-Acevedo, Angela Arnosa-Prieto, Lisandra de Castro-Alves, Yolanda Pineiro, Jose Rivas
Summary: In recent years, nanotechnology has made significant advancements in cancer therapy through the use of magnetic resonance contrast agents, nano-delivery systems, and magnetic hyperthermia treatments. By exploiting the small size and properties of nanoparticles, such as superparamagnetism, these theragnostic tools offer new possibilities for not only theragnosis, but also biotech procedures. One particular application is the use of bioconjugated magnetic nanoparticles in genetic engineering processes, which have shown enhanced efficiency, specificity, and speed in gene transfer systems compared to conventional methods.
Article
Nanoscience & Nanotechnology
Corisa Kons, Kathryn L. Krycka, Joshua Robles, Nikolaos Ntallis, Manuel Pereiro, Manh-Huong Phan, Hariharan Srikanth, Julie A. Borchers, Dariio A. Arena
Summary: We study the spatial distribution of spin orientation in magnetic nanoparticles with hard and soft magnetic layers. The nanoparticles have a core-shell structure, with a CoFe2O4 (CFO) core and a Fe3O4 (FO) shell. The high-resolution electron microscopy confirms the coherent spinel structure across the core-shell boundary in both variants. Magnetometry shows that the nanoparticles are superparamagnetic at room temperature but develop anisotropy at reduced temperatures. Small-angle neutron scattering (SANS) reveals a pronounced difference in the reversal process of magnetization parallel to the field for the two nanoparticle variants. These findings highlight the interplay between interfacial exchange coupling and anisotropy in tuning the properties of the nanoparticles for potential applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ana Silvia Gonzalez, Javier Garcia, Victor Vega, Rafael Caballero Flores, Victor M. Prida
Summary: In this study, a novel 3D nanostructured silver electrode was designed and its chemical surface and electrochemical properties were investigated. The electrode exhibited high capacitance retention, Coulombic efficiency, and cycle stability, making it suitable for applications in micro-supercapacitors or electrochemical devices.
Article
Materials Science, Multidisciplinary
Falk Muench, Sandra Schaefer, Miguel Mendez, Jose Angel Fernandez-Roldan, A. Silvia Gonzalez-Garcia, Victor Vega, Ulrike Kunz, Wolfgang Ensinger, Javier Garcia, Victor M. Prida
Summary: The properties and potential applications of three-dimensional ferromagnetic nanotubes have received a lot of attention. However, there have been limited studies on ferromagnetic nanotubes, especially those with irregular cross-sections. In this study, we introduce a synthetic platform for creating novel ferromagnetic nanotubes with diamond-shaped cross-sections and high aspect ratios. The nanotubes were plated using an electroless-plating deposition method, which allowed precise control over their geometry.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Physics, Multidisciplinary
Yuefei Liu, Anders Bergman, Andrey Bagrov, Anna Delin, Danny Thonig, Manuel Pereiro, Olle Eriksson, Simon Streib, Erik Sjoeqvist, Vahid Azimi-Mousolou
Summary: In this work, the existence of entangled steady-states in bipartite quantum magnonic systems at elevated temperatures is reported. The dissipative dynamics of two magnon modes in a bipartite antiferromagnet, coupled with a phonon mode and an external rotating magnetic field, are considered. The entanglement between the bipartite magnons is quantified using entanglement negativity, and its dependence on temperature and magnetic field is calculated. Evidence is provided that the coupling between the magnon and phonon modes is necessary for the entanglement, and it is shown that for specific phonon frequency and magnon-phonon coupling rate, there are always ranges of magnetic field amplitudes and frequencies where magnon-magnon entanglement persists at room temperature.
NEW JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Vahid Azimi-Mousolou, Anders Bergman, Anna Delin, Olle Eriksson, Manuel Pereiro, Danny Thonig, Erik Sjoqvist
Summary: Studying the quantum properties of magnons in antiferromagnetic materials is important for the development of nanomagnetism and energy efficient quantum technologies. Hybrid systems based on superconducting circuits enable effective coupling between magnons and transmon qubits, with the characteristics of magnons characterized by the Rabi frequency of the transmon.
Article
Optics
Vahid Azimi-Mousolou, Anders Bergman, Anna Delin, Olle Eriksson, Manuel Pereiro, Danny Thonig, Erik Sjoqvist
Summary: We investigate the entanglement properties of thermal states in spin-1/2 dimers under an external magnetic field. The entanglement transition in the temperature-magnetic-field plane reveals a duality in spin-spin interactions, with a pair of symmetric and antisymmetric dimers identified as dual categories. Each category is further classified into toric entanglement classes. The entanglement transition line is preserved from each toric entanglement class to its dual toric class. The toric classification indicates the topological signature of entanglement, suggesting potential topological stability for quantum information processing.
