Pulse-Field Magnetization for Disc-Shaped MgB2Bulk Magnets

Tailored RF pulse for magnetization inversion at ultrahigh field.

The radiofrequency (RF) transmit field is severely inhomogeneous at ultrahigh field due to both RF penetration and RF coil design issues. This particularly impairs image quality for sequences that use inversion pulses such as magnetization prepared rapid acquisition gradient echo and limits the use of quantitative arterial spin labeling sequences such as flow-attenuated inversion recovery. Here...

Influence of Segmentation of Ring-Shaped NdFeB Magnets with Parallel Magnetization on Cylindrical Actuators

This work analyses the effects of segmentation followed by parallel magnetization of ring-shaped NdFeB permanent magnets used in slotless cylindrical linear actuators. The main purpose of the work is to evaluate the effects of that segmentation on the performance of the actuator and to present a general overview of the influence of parallel magnetization by varying the number of segments and co...

Superconductor Magnetization Modeling for the Numerical Calculation of Field Errors in Accelerator Magnets

Theoretical limit of the minimal magnetization switching field and the optimal field pulse for Stoner particles.

The theoretical limit of the minimal magnetization switching field and the optimal field pulse design for uniaxial Stoner particles are investigated. Two results are obtained. One is the existence of a theoretical limit of the smallest magnetic field out of all possible designs. It is shown that the limit is proportional to the damping constant in the weak damping regime and approaches the Ston...

Resonant Magnetization Tunneling in Molecular Magnets

The frontier between the classical and quantum worlds can be approached in one of two ways: from the top down or the bottom up. The top-down approach entails starting with an essentially classical variable (e.g. the flux in a superconducting loop, the charge on a small superconducting island or the magnetization of a single-domain magnetic particle) and squeezing down the size of the system (th...