Irreversible Magnetization of MgB2Superconductor

Irreversible magnetization reversal In some Co . . based ailoy thin fUms

Irreversible magnetization reversal occurs either by coherent or incoherent spin rotation or by wall displacement. In electrodeposited Co-W, Co-Fe, and CooP 300--500-A. films, vibrating sample magnetometer hysteresis loop analyses indicate that magnetization reversal takes place by wall displacement. The formation and movement of domain walls has been put in evidence by Lorentz electron microsc...

Scaling properties of the irreversible magnetization curves of high-temperature superconductors.

A one-parameter scaling of the magnetization curves of the high-temperature superconductor Tl-Ba-Ca-Cu-0 causes all data points in the irreversible regime to collapse into a single curve M H f~ (H/H*). The scaling field H* is inversely proportional to temperature and f+ and f are th—e scaling functions for fields H above and below H*, respectively. The results are explained in terms of the Bean...

Anomalous behavior of the irreversible magnetization and time relaxation in YBa2Cu3O7 single crystals with splayed tracks

We have studied the angular dependence of the irreversible magnetization and its time relaxation in YBa2Cu3O7 single crystals with one or two families of columnar defects inclined with respect to the c axis. At high magnetic fields, the magnetization shows the usual maximum centered at the mean tracks’ orientation and an associated minimum in the normalized relaxation rate. In contrast, at low ...

Irreversible magnetization switching at the onset of superconductivity in a superconductor ferromagnet hybrid

Proton MR spectroscopy and magnetization transfer ratio in multiple sclerosis: correlative findings of active versus irreversible plaque disease.

PURPOSE To characterize plaques of multiple sclerosis (MS) using both proton MR spectroscopy and magnetization transfer (MT) imaging. METHODS The magnetization transfer ratio (MTR) was calculated from two series of three-dimensional gradient-recalled acquisition in the steady state (GRASS) images obtained with and without an MT saturation pulse. Proton spectra were acquired using the point-re...