@article{MTMT:34801218,
	title = {Incidence of the Brownian Relaxation Process on the Magnetic Properties of Ferrofluids},
	url = {https://m2.mtmt.hu/api/publication/34801218},
	author = {Vajtai, Lili and Nemes, Norbert Marcel and Morales, Maria del Puerto and Molnár, Kolos and Pinke, Balazs Gabor and Simon, Ferenc},
	doi = {10.3390/nano14070634},
	journal-iso = {NANOMATERIALS-BASEL},
	journal = {NANOMATERIALS},
	volume = {14},
	unique-id = {34801218},
	abstract = {Ferrofluids containing magnetic nanoparticles represent a special class of magnetic materials due to the added freedom of particle tumbling in the fluids. We studied this process, known as Brownian relaxation, and its effect on the magnetic properties of ferrofluids with controlled magnetite nanoparticle sizes. For small nanoparticles (below 10 nm diameter), the Neel process is expected to dominate the magnetic response, whereas for larger particles, Brownian relaxation becomes important. Temperature- and magnetic-field-dependent magnetization studies, differential scanning calorimetry, and AC susceptibility measurements were carried out for 6 and 13.5 nm diameter magnetite nanoparticles suspended in water. We identify clear fingerprints of Brownian relaxation for the sample of large-diameter nanoparticles as both magnetic and thermal hysteresis develop at the water freezing temperature, whereas the samples of small-diameter nanoparticles remain hysteresis-free down to the magnetic blocking temperature. This is supported by the temperature-dependent AC susceptibility measurements: above 273 K, the data show a low-frequency Debye peak, which is characteristic of Brownian relaxation. This peak vanishes below 273 K.},
	keywords = {NANOPARTICLES; Anisotropy; HYPERTHERMIA; Ferrofluid; Materials Science, Multidisciplinary; Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; MAGNETOMETRY; dipole interactions; Néel relaxation; Néel relaxation; Brownian relaxation},
	year = {2024},
	eissn = {2079-4991},
	orcid-numbers = {Molnár, Kolos/0000-0002-9331-4652}
}

@article{MTMT:34749016,
	title = {Real-space nonlocal Gilbert damping from exchange torque correlation applied to bulk ferromagnets and their surfaces},
	url = {https://m2.mtmt.hu/api/publication/34749016},
	author = {Nagyfalusi, Balázs and Szunyogh, László and Palotás, Krisztián},
	doi = {10.1103/PhysRevB.109.094417},
	journal-iso = {PHYS REV B},
	journal = {PHYSICAL REVIEW B},
	volume = {109},
	unique-id = {34749016},
	issn = {2469-9950},
	year = {2024},
	eissn = {2469-9969},
	orcid-numbers = {Palotás, Krisztián/0000-0002-1914-2901}
}

@article{MTMT:34749006,
	title = {Chemical potential of magnetic skyrmion quasiparticles in heavy-metal/iron bilayers},
	url = {https://m2.mtmt.hu/api/publication/34749006},
	author = {Nagyfalusi, Balázs and Udvardi, László and Szunyogh, László and Rózsa, Levente},
	doi = {10.1103/PhysRevB.109.094418},
	journal-iso = {PHYS REV B},
	journal = {PHYSICAL REVIEW B},
	volume = {109},
	unique-id = {34749006},
	issn = {2469-9950},
	year = {2024},
	eissn = {2469-9969},
	orcid-numbers = {Rózsa, Levente/0000-0001-9456-5755}
}

@article{MTMT:34738091,
	title = {Relativisztikusan mozgó állóhullám},
	url = {https://m2.mtmt.hu/api/publication/34738091},
	author = {Sükösd, Csaba and Bokor, Nándor},
	journal-iso = {FIZIKAI SZEMLE},
	journal = {FIZIKAI SZEMLE},
	volume = {74},
	unique-id = {34738091},
	issn = {0015-3257},
	year = {2024},
	pages = {66-70}
}

@article{MTMT:34719922,
	title = {Quantized Approach to Damped Transversal Mechanical Waves},
	url = {https://m2.mtmt.hu/api/publication/34719922},
	author = {Márkus, Ferenc and Gambár, Katalin},
	doi = {10.3390/quantum6010009},
	journal-iso = {QUANTUM REPORTS},
	journal = {QUANTUM REPORTS},
	volume = {6},
	unique-id = {34719922},
	abstract = {In information transfer, the dissipation of a signal is of crucial importance. The feasibility of reconstructing the distorted signal depends on the related permanent loss. Therefore, understanding the quantized dissipative transversal mechanical waves might result in deep insights. In particular, it may be valid on the nanoscale in the case of signal distortion, loss, or even restoration. Based on the description of the damped quantum oscillator, we generalize the canonical quantization procedure for the case of the transversal waves. Then, we deduce the related damped wave equation and the state function. We point out the two possible solutions of the propagating-damping wave equation. One involves the well-known Gaussian spreading solution superposed with the damping oscillation, in which the loss of information is complete. The other is the Airy function solution, which is non-spreading–propagating, so the information loss is only due to oscillation damping. However, the structure of the wave shape remains unchanged for the latter. Consequently, this fact may allow signal reconstruction, resulting in the capability of restoring the lost information.},
	keywords = {signal recovery; Airy beam; canonical quantization; damped quantum wave},
	year = {2024},
	eissn = {2624-960X},
	pages = {120-133}
}

@article{MTMT:34657449,
	title = {In Situ Observation of Perovskite Quantum Dots Driven by Photopolymerization Controlled Using a Digital Micromirror Device (Advanced Optical Materials 5/2024)},
	url = {https://m2.mtmt.hu/api/publication/34657449},
	author = {Tanaka, Hayato and Lagzi, István László and Nakanishi, Hideyuki},
	doi = {10.1002/adom.202470012},
	journal-iso = {ADV OPT MATER},
	journal = {ADVANCED OPTICAL MATERIALS},
	volume = {12},
	unique-id = {34657449},
	issn = {2195-1071},
	keywords = {PATTERN; Materials Science, Multidisciplinary; Photocuring; CsPbBr3; perovskite quantum dots},
	year = {2024},
	eissn = {2195-1071},
	pages = {202470012}
}

@article{MTMT:34554374,
	title = {Voltage-time dilemma and stochastic threshold-voltage variation in pure-silver atomic switches},
	url = {https://m2.mtmt.hu/api/publication/34554374},
	author = {Nyáry, Anna and Balogh, Zoltán and Vigh, Máté and Sánta, Botond and Pósa, László and Halbritter, András Ernő},
	doi = {10.1103/PhysRevApplied.21.014027},
	journal-iso = {PHYS REV APPL},
	journal = {PHYSICAL REVIEW APPLIED},
	volume = {21},
	unique-id = {34554374},
	issn = {2331-7019},
	abstract = {The formation and dissolution of silver nanowires plays a fundamental role in a broad range of resistive-switching devices, which fundamentally rely on the electrochemical-metallization phenomenon. It has been shown that resistive switching may also appear in pure metallic nanowires lacking any silver-ion-hosting embedding environment but this pure atomic switching mechanism differs fundamentally from the conventional electrochemical-metallization-based resistive switching. To facilitate the quantitative description of the former phenomenon, we investigate a broad range of Ag atomic junctions, with a special focus on the frequency dependence and the fundamentally stochastic cycle-to-cycle variation of the switching-threshold voltage. These devices are established in an ultrahigh-purity environment in which electrochemical metallization can be excluded. The measured characteristics are successfully described by a vibrational-pumping model, yielding consistent predictions for the weak frequency dependence and the large variance of the switching-threshold voltage. We also demonstrate that electrochemical-metallization-based resistive switching and pure atomic switching may appear in the same device structure and therefore the proper understanding of the pure atomic switching mechanism has a very relevant importance in silver-based electrochemical-metallization cells. © 2024 American Physical Society.},
	keywords = {SILVER; NANOWIRES; Atoms; metal ions; stochastic systems; Threshold voltage; Switching mechanism; silver nanowires; resistive switching; metallisation; stochastics; Electrochemicals; Frequencies dependence; Atomic switches; Switching threshold voltage; Threshold voltage variation},
	year = {2024},
	eissn = {2331-7019},
	orcid-numbers = {Vigh, Máté/0000-0001-5668-7735; Halbritter, András Ernő/0000-0003-4837-9745}
}

@article{MTMT:34536907,
	title = {Noise tailoring, noise annealing, and external perturbation injection strategies in memristive Hopfield neural networks},
	url = {https://m2.mtmt.hu/api/publication/34536907},
	author = {Fehérvári, János Gergő and Balogh, Zoltán and Török, Tímea Nóra and Halbritter, András Ernő},
	doi = {10.1063/5.0173662},
	journal-iso = {APL mach. learn.},
	journal = {APL machine learning.},
	volume = {2},
	unique-id = {34536907},
	abstract = {The commercial introduction of a novel electronic device is often preceded by a lengthy material optimization phase devoted to the suppression of device noise as much as possible. The emergence of novel computing architectures, however, triggers a paradigm shift in noise engineering, demonstrating that non-suppressed but properly tailored noise can be harvested as a computational resource in probabilistic computing schemes. Such a strategy was recently realized on the hardware level in memristive Hopfield neural networks, delivering fast and highly energy efficient optimization performance. Inspired by these achievements, we perform a thorough analysis of simulated memristive Hopfield neural networks relying on realistic noise characteristics acquired on various memristive devices. These characteristics highlight the possibility of orders of magnitude variations in the noise level depending on the material choice as well as on the resistance state (and the corresponding active region volume) of the devices. Our simulations separate the effects of various device non-idealities on the operation of the Hopfield neural network by investigating the role of the programming accuracy as well as the noise-type and noise amplitude of the ON and OFF states. Relying on these results, we propose optimized noise tailoring and noise annealing strategies, comparing the impact of internal noise to the effect of external perturbation injection schemes.},
	year = {2024},
	eissn = {2770-9019},
	orcid-numbers = {Balogh, Zoltán/0000-0002-9580-361X; Halbritter, András Ernő/0000-0003-4837-9745}
}

@article{MTMT:34536111,
	title = {Symmetry Breaking and Dynamic Transition in the Negative Mass Term Klein–Gordon Equations},
	url = {https://m2.mtmt.hu/api/publication/34536111},
	author = {Márkus, Ferenc and Gambár, Katalin},
	doi = {10.3390/sym16020144},
	journal-iso = {SYMMETRY-BASEL},
	journal = {SYMMETRY (BASEL)},
	volume = {16},
	unique-id = {34536111},
	abstract = {Through the discussion of three physical processes, we show that the Klein–Gordon equations with a negative mass term describe special dynamics. In the case of two classical disciplines—mechanics and thermodynamics—the Lagrangian-based mathematical description is the same, even though the nature of the investigated processes seems completely different. The unique feature of this type of equation is that it contains wave propagation and dissipative behavior in one framework. The dissipative behavior appears through a repulsive potential. The transition between the two types of dynamics can be specified precisely, and its physical meaning is clear. The success of the two descriptions inspires extension to the case of electrodynamics. We reverse the suggestion here. We create a Klein–Gordon equation with a negative mass term, but first, we modify Maxwell’s equations. The repulsive interaction that appears here results in a charge spike. However, the Coulomb interaction limits this. The charge separation is also associated with the high-speed movement of the charged particle localized in a small space domain. As a result, we arrive at a picture of a fast vibrating phenomenon with an electromagnetism-related Klein–Gordon equation with a negative mass term. The calculated maximal frequency value ω=1.74×1021 1/s.},
	keywords = {DISSIPATION; Symmetry breaking; Lagrangian; Repulsive interaction; Dynamic transition; generator potentials; Klein–Gordon equation with a negative mass term; Lorentz invariant behavior; tachyon solution},
	year = {2024},
	eissn = {2073-8994}
}

@article{MTMT:34516454,
	title = {Synthesis of zeolitic imidazolate framework-8 using an electric field in a gelled medium},
	url = {https://m2.mtmt.hu/api/publication/34516454},
	author = {Német, Norbert and Holló, Gábor and Valletti, Nadia and Farkas, Szabolcs and Dúzs, Brigitta and Kukovecz, Ákos and Schuszter, Gábor and Szalai, István and Rossi, Federico and Lagzi, István László},
	doi = {10.1039/D3MA00690E},
	journal-iso = {MATER ADV},
	journal = {MATERIALS ADVANCES},
	volume = {5},
	unique-id = {34516454},
	abstract = {Using the ion migration in various gel mediums governed by a direct electric field is a well-known technique, especially in analytical chemistry, to separate charged chemical species. This approach is also suitable for generating different-sized crystals and controlling the pattern formation in gels. Here we present a synthesis of zeolitic imidazolate framework-8 in an agarose gel driven by a direct electric field. We investigate the effect of an applied electric current on the macroscopic pattern formed in the gel, morphology, size, and dispersity of the ZIF-8 crystals. Upon increasing the electric current, the average size of the particles and dispersity of the samples decreased along the gel tube from the liquid-gel interface of the anodic side. This trend is opposite to the results obtained in synthesising particles utilizing only diffusion for mass transport. The electric field caused peak-doubling in the X-ray diffraction (XRD) pattern. To support the experimental observations, we developed a reaction-diffusion-migration model, which qualitatively describes the pattern formation observed in experiments. © 2024 RSC.},
	year = {2024},
	eissn = {2633-5409},
	pages = {1199-1204},
	orcid-numbers = {Kukovecz, Ákos/0000-0003-0716-9557; Schuszter, Gábor/0000-0002-9170-9933}
}