Abstract The availability of sub 100 fs short and highly intense free-electron laser (FEL) pulses allows for new insights in laser-induced ultrafast demagnetization (LID) ferromagnetic thin films on nanometer length scales. We designed a pair in-vacuum Helmholtz coils, providing pulsed magnetic fields up to µ 0 H z = ±45 mT, time-resolved experiments at FEL sources transmission geometry. report...

0957-4158/$ see front matter 2010 Elsevier Ltd. A doi:10.1016/j.mechatronics.2010.09.001 ⇑ Corresponding author. ⇑⇑ Corresponding author. E-mail addresses: [email protected] (J. Park), spark@jn Various electromagnetic based actuation (EMA) methods have been proposed for the actuation of microrobots. The advantage of EMA is that it can generate a wireless driving force for the microrobot, and this i...

A ship built from ferromagnetic steel disturbs the uniformity of Earth’s magnetic field. Changes of ship’s signature are due to magneto-mechanical interaction hull with field. The ship’s field can be detected by a naval mine. For this reason, vessel has be demagnetized. There several methods de-perming. The results experimental and computer simulations de-perming process using coils lying on se...

The effect of pulsing electromagnetic fields (PEMFs) on bone repair was studied in principal metacarpal bones of eight adult male horses: Six horses were treated with PEMFs, and two horses were untreated. In treated horses, Helmholtz coils were applied during a 60-day period to the left metacarpal bones, bored with eight holes of equal diameter and depth, from the middiaphysis toward the distal...

Electromagnetic interference is a concern for people wearing cardiovascular implantable electronic devices (CIEDs). The aim of this study was to assess the electromagnetic compatibility between CIEDs and the magnetic field of a common wireless charging technology. To do so the voltage induced in CIEDs by Qi A13 design magnetic fields were measured and compared with the performance limits set by...

This paper addresses the design of a novel electromagnetic flow meter for use in multiphase flows. The relationship between the magnetic field distribution, the induced electrical potential and the velocity distribution of the conducting continuous phase was studied using COMSOL Multiphysics software (formally known as FEMLAB). The electromagnetic flow meter was modelled to its physical specifi...

INTRODUCTION: Silicon-based microcoils of planar (1,2), solenoid (3) and Helmholtz (4) design have been recently investigated, with the main intention of developing extremely cheap local coils for clinical MRS, which would not have to be cleaned but could simply be discarded. We have been developing a needle coil design for insertion into tissue. Needle coils have a very small field of view ort...

Various types of actuation methods for intravascular locomotive microrobot have been proposed and demonstrated. Among the actuation methods, electromagnetic based actuation (EMA) was considered as a promising mechanism. In generally, planar EMA systems for 2 dimensional movement of the microrobot were proposed and demonstrated. In this paper, we present 3 dimensional (D) EMA systems for the 3D ...