Introduction to MFM	Instrumentation	Projects
Gallery	Publications	Team

Instrumentation

UHV-System

The UHV-System consists of a load lock, a preparation chamber, an analysis chamber and a cryostat chamber. Tips and samples are introduced via the load lock. In situ treatment is accomplished in the preparation chamber, which is equipped with three different types of heaters (electron bombardment, resistive and direct current), a sputter gun and an iron evaporation cell. The analysis chamber contains a combined LEED (low energy electron diffraction) and AES (Auger electron spectroscopy) unit for sample characterization. The cryostat chamber contains the bath cryostat with the microscope and the superconducting magnet.

Cryostat

Two tanks for cooling liquids are located inside the cryostat chamber. The outer tank is filled with liquid nitrogen. Below the outer tank, a gold coated copper radiation shield is mounted.

The outer tank with the radiation shield, fully encloses the inner liquid helium tank, which houses the superconducting magnet. The magnet has a split-coil geometry with a central bore of 60 mm in diameter, which hosts the microscope. With its coils, it produces a maximum field of 5 T perpendicular to the sample surface.

The split coil geometry allows to exchange tip and sample via a cutaway through the liquid helium tank to the microscope in the bore. This side access can be opened and closed with a shutter. Therefore, in situ tip and sample exchange without moving the microscope is possible.

Read more about thermal anchoring of the microscope.

Read more about the construction of the microscope body.

Introduction to MFM | Instrumentation | Projects | Gallery | Publications | Team

impressum   © copyright 2002 by group R - university of hamburg