21 papers · ranked by Valyu relevance
Jianzhi Yang, Minxia Shi, Xu Zhang, Yuzheng Ma + 4 more
'Shuai Yuan' 'Bangcheng Han' 'Israel Felner'] To achieve the nearly zero-field environment, demagnetization is an indispensable step for magnetic shields composed of high-permeability material, which adjusts the magnetization of the material to establish magnetic equilibrium with the environmental field and improve the…
Susanne van Berkum, Ben H. Erné
The magnetic remanence of silica microspheres with a low concentration of embedded cobalt ferrite nanoparticles is studied after demagnetization and remagnetization treatments. When the microspheres are dispersed in a liquid, alternating current (AC) magnetic susceptibility spectra reveal a constant characteristic…
Rasmus Bjørk, C.R.H. Bahl
The demagnetization factors for randomly packed spherical particle powders with different porosities, sample aspect ratios and monodisperse, normal and log-normal particle size distributions have been calculated using a numerical model. For a relative permeability of 2, comparable to room temperature Gd, the calculated…
Rasmus Bjørk, Zongyan Zhou
We investigate if the demagnetization factor for a randomly packed powder of magnetic spheroidal particles depend on the shape of the spheroidal particles and what the internal variation in magnetization is within such a powder. A spheroid is an ellipsoid of revolution, i.e. an ellipsoid with two semi-major axis being…
Mathias Zambach, Miriam Varón, Mads Radmer Almind, Matti Knaapila + 3 more
'Ziwei Ouyang' 'Marco Beleggia' 'Cathrine Frandsen'] According to the classical laws of magnetism, the shape of magnetically soft objects limits the effective susceptibility. For example, spherical soft magnets cannot display an effective susceptibility larger than 3. Although true for macroscopic multi-domain magnetic…
Hyeon-Kyu Park, Sang-Koog Kim
Recently developed permanent magnets, featuring specially engineered microstructures of inhomogeneous magnetic phases, are being considered as cost-effective alternatives to homogeneous single-main-phase hard magnets composed of Nd2Fe14B, without compromising performance. In this study, we conducted a comprehensive…
Vagson L. Carvalho‐Santos
Magnetic nanowires have been considered to compose devices based on the concepts of spintronic and magnonic technologies. Despite stripe and cylindrical nanomagnets being widely studied, curvature effects on the magnetic properties of nanowires have been low explored. In this work the analysis of the influence of…
Juan Manuel Martínez-Huerta, Joaquín de la Torre Medina, L. Piraux, A. Encinas
'A. Encinas'] A mean field model is presented for the configuration dependent effective demagnetizing and anisotropy fields in assemblies of exchange decoupled magnetic particles of arbitrary shape which are expressed in terms of the demagnetizing factors of the particles and the volumetric shape containing the…
Marek Przybylski, Dariusz Kapelski, Barbara Ślusarek, Sławomir Wiak + 1 more
'Andreas Hütten'] Magnetization of large Nd-Fe-B sintered permanent magnets is still challenging. This type of permanent magnet is electrically conductive, so impulse magnetization causes a flow of eddy currents which prevent magnetization of the whole volume of the magnet. The paper deals with the impulse…
Waddah I. Moghram, Anton Kruger, Edward A. Sander, John C. Selby
In this work, we present a single-pole magnetic tweezers (MT) device designed for integration with substrate deformation tracking microscopy (DTM) and/or traction force microscopy (TFM) experiments intended to explore extracellular matrix rheology and human epidermal keratinocyte mechanobiology. Assembled from…
Carlos O. Amorim, Wei Wu
Magnetic nanoparticles (MNPs) are advanced materials that combine the unique properties of magnetic materials and nanoscale dimensions, enabling a wide range of applications in biomedicine, environmental science, and information technology. This review provides a comprehensive yet accessible introduction to the…
Authors not listed
We present DAISY, a web-based computational tool for the simulation of dynamic magnetic properties of single molecule magnets and supermagnetic nanoparticles. The tool is parametric and accepts relaxation parameters of different mechanisms, including Orbach, Raman, Quantum Tunneling of the Magnetization and the direct…
D. Kah, C. Dürrbeck, W. Schneider, B. Fabry + 1 more
Magnetic tweezers based on solenoids with iron alloy cores are widely used to apply large forces (~100 nN) onto micron-sized (~5 μm) superparamagnetic particles for mechanical manipulation or microrheological measurements at the cellular and molecular level. The precision of magnetic tweezers, however, is limited by…
Maryam M. Ahmed, N.I. Abu-Elsaad
Superparamagnetism Authors: ['Maryam M. Ahmed' 'N.I. Abu-Elsaad'] Ferrites, magnetic materials primarily composed of iron oxides, exhibit diverse magnetic behaviors, including diamagnetism, paramagnetism, ferromagnetism, antiferromagnetism, ferrimagnetism, and superparamagnetism. This paper explores the fundamental…
Beata Górka-Kostrubiec, Iga Szczepaniak-Wnuk
Magnetite in mixture with metallic iron in indoor dust samples was examined using several magnetic analyses, thermomagnetic curves of the magnetic susceptibility and the induced magnetization vs. temperature, hysteresis loops, and first-order reversal curves. The study of the magnetic properties was supplemented by the…
Jack Emerson-King, Gemma Gransbury, Benjamin Atkinson, William Blackmore + 3 more
Lanthanides have recently shown magnetic memory at both the atomic and molecular level. The temperatures at which single-molecule magnets (SMMs) show magnetic hysteresis only increased from 4 K to 14 K in nearly 25 years since the discovery of the first SMM in 1993. However, since 2017 energy barriers to magnetic…
Ann M. Hirt, Monika Kumari, David Heinke, Alexander Kraupner
Magnetic resonance imaging (MRI) and magnetic particle imaging (MPI) are powerful methods in the early diagnosis of diseases. Both imaging techniques utilize magnetic nanoparticles that have high magnetic susceptibility, strong saturation magnetization, and no coercivity. FeraSpinTM R and its fractionated products have…
amelia carolina sparavigna
Magnetic iron oxides, such as Fe3O4, α-Fe2O3, γ-Fe2O3, have unique magnetic, catalytic and biochemical features, rendering them suitable for several specific technological and biomedical applications. In a previous study, for instance, we considered the magnetite Fe3O4 nanoparticles dispersed in supporting materials to…
Vitalii Zablotskii, Tatyana Polyakova, Alexandr Dejneka
The diffusion of biologically active molecules is a ubiquitous process, controlling many mechanisms and the characteristic time scales for pivotal processes in living cells. Here, we show how a high static magnetic field (MF) affects the diffusion of paramagnetic and diamagnetic species, including oxygen, hemoglobin…
Euan Brechin, Emily Payne, Mukesh Singh, Gary Nichol + 6 more
The solvothermal reaction of Ni(ClO4)2·6H2O with hmpH and picH in a basic MeOH solution affords [Ni7(hmp)7.55(pic)4.45](ClO4)2·6MeOH (1·6MeOH) directly upon cooling the mother liquor. The metallic skeleton of 1 describes a [NiII7] centred hexagon, commonly referred to as an Anderson wheel. Magnetic meaurements reveal…
Malte T. Ahlers, Christoph T. Block, Michael Winklhofer, Martin Greschner
A large number of behavioral experiments have demonstrated the existence of a magnetic sense in many animal species. Further, studies with immediate gene expression markers have identified putative brain regions involved in magnetic information processing. In contrast, very little is known about the physiology of the…