Direct measurements of the penetration depth in a superconducting film using magnetic force microscopy

Abstract

We report the local measurements of the magnetic penetration depth $\lambda$ in a superconducting Nb film using magnetic force microscopy (MFM). We developed a method for quantitative extraction of the penetration depth from single-parameter simultaneous fits to the lateral and height profiles of the MFM signal, and demonstrate that the obtained value is in excellent agreement with that obtained from the bulk magnetization measurements.

3 pages, 4 figures, submitted to APL on 08/18/09

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• Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor
• Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry
• A Terraced Scanning Superconducting Quantum Interference Device Susceptometer with Sub-Micron Pickup Loops
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Cited by in corpus (11)

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• Quantitative assessment of pinning forces and the superconducting gap in NbN thin films from complementary magnetic force microscopy and transport measurements
• Large magnetic penetration depth and thermal fluctuations in a Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$ (x=0.097) single crystal
• Evidence for current suppression in superconductor-superconductor bilayers
• Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy
• Depth-resolved measurement of the Meissner screening profile in a niobium thin film from spin-lattice relaxation of the implanted $\beta$-emitter ${}^8$Li
• Thermal annealing enhancement of Josephson critical currents in ferromagnetic CoFeB
• Vortex confinement through an unquantized magnetic flux
• A practical guide for building superconducting quantum devices