Magnetic torque studies on FFLO phase in magnetic-field-induced organic superconductorλ-(BETS)2FeCl4

2012 ◽  
Vol 85 (17) ◽  
Author(s):  
S. Uji ◽  
K. Kodama ◽  
K. Sugii ◽  
T. Terashima ◽  
Y. Takahide ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Torque ◽  
Fflo Phase

Finite-Element Analysis of Magnetoelastic Buckling of Ferromagnetic Beam Plate

1980 ◽  
Vol 47 (2) ◽  
pp. 377-382 ◽  
Author(s):  
K. Miya ◽  
T. Takagi ◽  
Y. Ando
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Results ◽  
The Finite Element Method ◽  
Magnetic Torque ◽  
Element Analysis ◽  
Element Method

Some corrections have been made hitherto to explain the great discrepancy between experimental and theoretical values of the magnetoelastic buckling field of a ferromagnetic beam plate. To solve this problem, the finite-element method was applied. A magnetic field and buckling equations of the ferromagnetic beam plate finite in size were solved numerically assuming that the magnetic torque is proportional to the rotation of the plate and by using a disturbed magnetic torque deduced by Moon. Numerical and experimental results agree well with each other within 25 percent.

scholarly journals Janus microdimer swimming in an oscillating magnetic field

2020 ◽  
Vol 7 (12) ◽  
pp. 200378
Author(s):  
Jinyou Yang
Keyword(s):  
Magnetic Field ◽  
Drug Delivery ◽  
Magnetic Fields ◽  
Minimally Invasive ◽  
Environmental Remediation ◽  
Magnetic Torque ◽  
Link Type ◽  
Special Direction ◽  
Oscillating Magnetic Field

Artificial microswimmers powered by magnetic fields have numerous applications, such as drug delivery, biosensing for minimally invasive medicine and environmental remediation. Recently, a Janus microdimer surface walker that can be propelled by an oscillating magnetic field near a surface was reported by Li et al. ( Adv. Funct. Mater. 28 , 1706066. ( doi:10.1002/adfm.201706066 )). To clarify the mechanism for the surface walker, we numerically studied in detail a Janus microdimer swimming near a wall actuated by an oscillating magnetic field. The results showed that a Janus microdimer in an oscillating magnetic field can produce magnetic torque in the y -direction, which eventually propels the Janus microdimer along the x -direction near a wall. Furthermore, we found that the Janus microdimer can also move along a special direction in an oscillating magnetic field with two orientations without a wall. The knowledge obtained in this study is fundamental for understanding the interactions between a Janus microdimer and surfaces in an oscillating magnetic field and is useful for controlling Janus microdimer motion with or without a wall.

The Torque Characteristics of the Cycloid Permanent Magnetic Gear Based on Halbach

2012 ◽  
Vol 271-272 ◽  
pp. 1244-1248
Author(s):  
Wei Na Hao ◽  
Xue Song Zhu ◽  
Jun Zhou
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Permanent Magnets ◽  
Magnetic Torque ◽  
Torque Density ◽  
Halbach Array ◽  
Magnetic Filed ◽  
Air Gap Magnetic Field ◽  
Very High ◽  
Torque Angle

This paper presents a new cycloid permanent magnet gear(PM gear) based on Halbach array, which has the advantages such as extreme torque density and a very high gearing ratio. And the Halbach array can produce one-sided filed that will increase the magnetic filed intensity. The air-gap magnetic field of cycloid PM gear based on Halbach is got by adopting finite element method. At the same time, to research the torque characteristics, the factors which affect the magnetic torque of cycloid PM gear are studied respectively through the FEM, such as torque angle，offset，thickness of permanent magnets and yoke irons.

Orbital Effect on FFLO Phase and Energy Dissipation due to Vortex Dynamics in Magnetic-Field-Induced Superconductor λ-(BETS)2FeCl4

2013 ◽  
Vol 82 (3) ◽  
pp. 034715 ◽  
Author(s):  
Shinya Uji ◽  
Kouta Kodama ◽  
Kaori Sugii ◽  
Taichi Terashima ◽  
Takahide Yamaguchi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Dissipation ◽  
Vortex Dynamics ◽  
Orbital Effect ◽  
Fflo Phase

scholarly journals Magnetic field effect on the magnetic torque and the magnetostriction in (CH3)2CHNH3CuCl3

2006 ◽  
Vol 51 ◽  
pp. 187-190
Author(s):  
T Suzuki ◽  
T Saito ◽  
T Sasaki ◽  
A Oosawa ◽  
T Goto ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Magnetic Torque

scholarly journals Crawling Magnetic Robot to Perform a Biopsy in Tubular Environments by Controlling a Magnetic Field

2021 ◽  
Vol 11 (11) ◽  
pp. 5292
Author(s):  
Eunsoo Jung ◽  
Jaekwang Nam ◽  
Wonseo Lee ◽  
Jongyul Kim ◽  
Gunhee Jang
Keyword(s):  
Magnetic Field ◽  
Friction Force ◽  
Magnetic Force ◽  
Three Dimensional ◽  
Glass Tube ◽  
Load Cell ◽  
Magnetic Torque ◽  
Biopsy Needle ◽  
Three Dimensional Printing ◽  
Dimensional Printing

We developed a crawling magnetic robot (CMR), which can stably navigate and perform biopsies remotely in tubular environments by controlling a magnetic field. The CMR is composed of a crawling part and a biopsy part. The crawling part allows the CMR to crawl forward and backward via an asymmetric friction force generated by an external precessional magnetic field. The biopsy part closes or opens the cover of a needle to use the biopsy needle selectively with the control of the external precessional magnetic field. The cover of the biopsy part prevents damage to the tubular environments because the biopsy needle is inside the cover while the CMR is navigating. We developed the design of the proposed CMR using magnetic torque constraints and a magnetic force constraint, and then we fabricated the CMR with three-dimensional printing technology. Finally, we conducted an experiment to measure the CMR’s puncturing force with a load cell and conducted an experiment in a Y-shaped watery glass tube with pseudo-tissue to verify the crawling motion, the uncovering and covering motion of the biopsy needle, and the CMR’s ability to extract tissue with the biopsy needle.

scholarly journals Single-cell motion of magnetotactic bacteria in microfluidic confinement: interplay between surface interaction and magnetic torque

2021 ◽  
Author(s):  
Agnese Codutti ◽  
Mohammad A. Charsooghi ◽  
Elisa Cerdá-Doñate ◽  
Hubert M. Taïeb ◽  
Tom Robinson ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Cell ◽  
Cell Tracking ◽  
Brownian Particle ◽  
Single Cells ◽  
Natural Habitat ◽  
Magnetotactic Bacteria ◽  
Particle Model ◽  
Complex Environments ◽  
Magnetic Torque

AbstractSwimming microorganisms often experience complex environments in their natural habitat. The same is true for microswimmers in envisioned biomedical applications. The simple aqueous conditions typically studied in the lab differ strongly from those found in these environments and often exclude the effects of small volume confinement or the influence that external fields have on their motion. In this work, we investigate magnetically steerable microswimmers, specifically magnetotactic bacteria, in strong spatial confinement and under the influence of an external magnetic field. We trap single cells in micrometer-sized microfluidic chambers and track and analyze their motion, which shows a variety of different trajectories, depending on the chamber size and the strength of the magnetic field. Combining these experimental observations with simulations using a variant of an active Brownian particle model, we explain the variety of trajectories by the interplay between the wall interactions and the magnetic torque. We also analyze the pronounced cell-to-cell heterogeneity, which makes single-cell tracking essential for an understanding of the motility patterns. In this way, our work establishes a basis for the analysis and prediction of microswimmer motility in more complex environments.

scholarly journals Development of Magnetic Torque Stimulation (MTS) Utilizing Rotating Uniform Magnetic Field for Mechanical Activation of Cardiac Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1684
Author(s):  
Myeongjin Song ◽  
Jongseong Kim ◽  
Hyundo Shin ◽  
Yekwang Kim ◽  
Hwanseok Jang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transforming Growth Factor Beta ◽  
Human Heart ◽  
Magnetic Particles ◽  
Transforming Growth Factor ◽  
Cardiac Cells ◽  
Rotating Magnetic Field ◽  
Heart Cells ◽  
Magnetic Torque ◽  
Entire Area

Regulation of cell signaling through physical stimulation is an emerging topic in biomedicine. Background: While recent advances in biophysical technologies show capabilities for spatiotemporal stimulation, interfacing those tools with biological systems for intact signal transfer and noncontact stimulation remains challenging. Here, we describe the use of a magnetic torque stimulation (MTS) system combined with engineered magnetic particles to apply forces on the surface of individual cells. MTS utilizes an externally rotating magnetic field to induce a spin on magnetic particles and generate torsional force to stimulate mechanotransduction pathways in two types of human heart cells—cardiomyocytes and cardiac fibroblasts. Methods: The MTS system operates in a noncontact mode with two magnets separated (60 mm) from each other and generates a torque of up to 15 pN µm across the entire area of a 35-mm cell culture dish. The MTS system can mechanically stimulate both types of human heart cells, inducing maturation and hypertrophy. Results: Our findings show that application of the MTS system under hypoxic conditions induces not only nuclear localization of mechanoresponsive YAP proteins in human heart cells but also overexpression of hypertrophy markers, including β-myosin heavy chain (βMHC), cardiotrophin-1 (CT-1), microRNA-21 (miR-21), and transforming growth factor beta-1 (TGFβ-1). Conclusions: These results have important implications for the applicability of the MTS system to diverse in vitro studies that require remote and noninvasive mechanical regulation.

ANISOTROPY OF MULTILAYERED (CU,C)BA2CA3CU4OY SUPERCONDUCTORS STUDIED BY TORQUE MAGNETOMETRY

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3285-3289 ◽  
Author(s):  
K. TOKIWA ◽  
T. KOGANEZAWA ◽  
S. MIKUSU ◽  
T. WATANABE ◽  
A. IYO ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Carrier Concentration ◽  
Anisotropy Ratio ◽  
Magnetic Torque ◽  
Torque Magnetometry ◽  
Torque Measurements ◽  
Hall Effect Measurements ◽  
London Model

The magnetic torque of ( Cu , C ) Ba 2 Ca 3 Cu 4 O y ( ( Cu , C )-1234) aligned samples with various carrier concentrations has been measured under a magnetic field of 9 T at 80 K and 90 K. The carrier concentration was determined by Hall effect measurements. From angular dependent torque measurements, the anisotropy ratio γ was estimated using the 3D anisotropic London model. The γvalues decreased from 23 to 10 with an increase in the average Hall number per CuO 2 plane ( n H); however, these samples showed a nearly constant Tc of about 117 K. These results indicate that the anisotropy of ( Cu , C )-1234 strongly reflects the doping levels of the outer planes.

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