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Title: Field-dependent vortex pinning strength in a periodic array of antidots
Authors: Silhanek, Alejandro
Raedts, Sophie
Lange, Martin
Moshchalkov, Victor #
Issue Date: 2003
Publisher: AMERICAN PHYSICAL SOC
Series Title: Physical review. B, Condensed matter and materials physics vol:67 issue:6
Conference: date:Katholieke Univ Leuven, Lab Vaste Stoffys & Magnetisme, B-3001 Louvain, Belgium
Abstract: We explore the dynamic response of vortex lines in a Pb thin film with a periodic array of antidots by means of ac-susceptibility measurements. For low drive field amplitudes, within the Campbell regime, vortex motion is of intravalley type and the penetration depth is related to the curvature of the pinning potential well alpha. For dc fields below the first matching field H-1, alpha reaches its highest value associated with a Mott insulator like phase where vortex lines are strongly localized at the pinning sites. For H-1<H-dc<H-2, the response is mainly due to the interstitial vortices and &alpha; drops to smaller values as expected for this metallic like regime. Strikingly, for H-2<H-dc<H-3, we observe that &alpha; reduces further down. However, for H-3<H-dc<H-4, a reentrance in the pinning strength is observed, due to a specific configuration of the flux-line lattice which strongly restricts the mobility of vortices. We present a possible explanation for the measured &alpha;(H-dc) dependence based on the different flux-line lattice configurations.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Tutorial services, Faculty of Science
# (joint) last author

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