Glassy vortex dynamics induced by a random array of magnetic particles above a superconductor |
| |
Authors: | Sun Young Salamon M B Garnier K Averback R S |
| |
Institution: | Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. |
| |
Abstract: | The magnetic relaxation of a Nb film covered with a random array of permalloy particles has been studied using various procedures. When the sample undergoes a field-cooled process, the magnetic relaxation becomes logarithmic in time. The relaxation rate is nearly temperature independent at low temperature and characteristic glassy dynamics-aging and memory effects-are observed. These results are interpreted as the consequence of pinning by the statistical variation of the number of nanoparticles within the area of a vortex core. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|