I10-1 Absorption

The absorption end branch of I10 is optimized for studies of the electronic structure of materials using the x-ray absorption and of magnetism using  x-ray dichroism effect in absorption.

It is equipped with the high field magnet end station and the electromagnet end station is optimized for studies of magnetism using  x-ray dichroism. These stations provides complementary sample environments in terms of the field intensity and temperature range.

The high field magnet is a superconducting split pair coil which can produce a magnetic field up to 14T and cool the sample down to 3K.

The electromagnet end station is based around a commertial electromagnet that can reach up to 1.5 T coupled with a Janis cryostat. 

The magnetic field is directed along the direction of the x-ray beam.

Main system specifications of both end stations are summarized in the following table:

Dichroism effect in absorption can be simultaneosly detected by total electron yield and fluorescence yield in both endstations.

The total electron yield is more surface sensitive. This is achieved by grounding the electrically isolated sample through a sensitive current amplifier.

The fluorescence yield gives more sensitivity to the bulk of the sample. This is achieved with a photodiode placed close to the sample.

The sample is placed in ultra high vacuum.

The sample is mounted on the Cu sample holder.

There are several ways of mouting the sample:

• to glue samples using silver paint or silver epoxy,
• to attach samples using Carbon double-sided tape,
• to hold samples using clamps made from Ta foil.

The sample can be post cleaved in both end stations.