Direct measurement of the magnetic penetration depth by magnetic force microscopy

Abstract

We present an experimental approach using magnetic force microscopy for measurements of the absolute value of the magnetic penetration depth $\lambda$ in superconductors. $\lambda$ is obtained in a simple and robust way without introducing any tip modeling procedure via direct comparison of the Meissner response curves for a material of interest to those measured on a reference sample. Using a well-characterized Nb film as a reference, we determine the absolute value of $\lambda$ in a Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$ single crystal and a MgB${}_2$ thin film through a comparative experiment. Our apparatus features simultaneous loading of multiple samples, and allows straightforward measurement of the absolute value of $\lambda$ in superconducting thin film or single crystal samples.

References in corpus (12)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor
• The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels
• Controlled Manipulation of Individual Vortices in a Superconductor
• Local measurement of the superfluid density in the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ across the superconducting dome
• Growth of high quality large area MgB2 thin films by reactive evaporation
• Effect of annealing on the specific heat of Ba(Fe1-xCox)2As2
• Quantitative assessment of pinning forces and the superconducting gap in NbN thin films from complementary magnetic force microscopy and transport measurements
• Nonlinear microwave response of MgB2
• 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
• Measurement of the magnetic penetration depth of a superconducting MgB${}_2$ thin film with a large intraband diffusivity
• Anisotropy and Penetration Depth of MgB${}_2$ from ${}^{11}$B NMR

Cited by in corpus (11)

• Magnetic penetration-depth measurements of a suppressed superfluid density of superconducting Ca${}_{0.5}$Na${}_{0.5}$Fe${}_2$As${}_2$ single crystals by proton irradiation
• Real-space probing of the local magnetic response of thin-film superconductors using single spin magnetometry
• Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsO${}_{1-x}$F${}_x$
• Construction of a ${}^3$He magnetic force microscope with a vector magnet
• Evidence for current suppression in superconductor-superconductor bilayers
• Spatially resolved penetration depth measurements and vortex manipulation in the ferromagnetic superconductor ErNi2B2C
• Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy
• Vortex confinement through an unquantized magnetic flux
• Intrinsic superconducting properties and vortex dynamics in heavily overdoped Ba(Fe${}_{0.86}$Co${}_{0.14}$)${}_2$As${}_2$ single crystal
• Microscopic Insights into London Penetration Depth: Application to CeCoIn${}_5^{}$
• Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures