Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Scanning Probe Techniques
O 37.1: Poster
Tuesday, March 17, 2015, 18:15–21:00, Poster A
Construction of a dilution fridge based UHV spin-polarized STM operational in a vector magnetic field — •Jan Hermenau1, Andreas Sonntag1, and Alexander Khajetoorians2 — 1Institute of Nanostructure and Solid State Physics, Hamburg University, Hamburg, Germany — 2Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
Unraveling many of the current dilemmas in nanoscience hinges on the advancement of techniques which can probe the spin degrees of freedom with high spatial, energy, and ultimately high temporal resolution. With the development of sub-Kelvin high-magnetic field STM, two complementary methods, namely spin-polarized scanning tunneling spectroscopy (SP-STS) and inelastic STS (ISTS), can address single spins at the atomic scale with unprecedented precession. Nevertheless, common cryostat designs for spin-polarized STM sub-Kelvin application are based on 3He liquification, which are limited in base temperature, hold time, and cooling power. To address these limitations for spin-polarized detection, we demonstrate the design and construction of a dilution fridge based UHV spin-polarized microscope operational in a vector magnetic field, capable of atomic spin detection and atomic manipulation. Our design consists of tip/sample exchange at cold temperatures and features extremely low 4He consumption with a long hold time. The easy-to-use compact design is capable of cold material deposition, and it is housed in an ultra-quiet laboratory featuring a 150 isolated foundation and proper acoustical and RF shielding.