Design of a variable temperature scanning force microscope

Abstract

We have developed the variable temperature scanning force microscope capable of performing both magnetic resonance force microscopy (MRFM) and magnetic force microscopy (MFM) measurements in the temperature range between 5 and 300 K. Modular design, large scanning area, and interferometric detection of the cantilever deflection make it a sensitive, easy to operate, and reliable instrument suitable for studies of the dynamic and static magnetization in various systems. We have verified the performance of the microscope by imaging vortices in a Nb thin film in the MFM mode of operation. MRFM spectra in a diphenyl-picryl-hydrazyl film were recorded to evaluate the MRFM mode of operation.

Magnetic penetration-depth measurements of a suppressed superfluid density of superconducting Ca0.5Na0.5FeKim1, Haberkorn2, Graf3 et al. 2012Phys. Rev. BSelf Cite171180View full textAdd to dashboardCite

“…The sample was mounted in a rotatable probe and measurements were performed in magnetic fields varying between 0 and 9 T. MFM measurements described here were performed in a home-built low-temperature MFM apparatus. 32 Three samples, CNFA, irradiated CNFA (ICNFA), and a Nb reference film were loaded and investigated in a comparative experiment within a single cool-down. The magnetic stray field calibration was performed by imaging vortices in a Nb reference as a function of applied magnetic field.…”

Direct measurement of the magnetic penetration depth by magnetic force microscopy

“…28 We have developed an additional capability of mounting multiple samples (including a reference sample), as shown in Fig. 1(a), for acquiring a complete set of MFM data for each of the samples within a single cool-down.…”

Measurement of the magnetic penetration depth of a superconducting MgB2thin film with a large intraband diffusivity

“…The sample has dimensions L=4 mm × W=5 mm × t=500 nm, and exhibits a full superconducting volume fraction based on measurements using a commercial SQUID magnetometer (Quantum Design magnetic property measurement system, MPMS) All MFM measurements described here were performed in a home-built low temperature MFM apparatus. 23 Temperature dependent vortex images were taken in the frequency-modulated mode after a small magnetic field was applied above T c (field-cooled). We used high resolution SSS-QMFMR cantilevers.…”