Soft X-ray spectroscopy of clusters, surfaces and interfaces

Ultra low temperature XMCD

The low temperature endstation provides our groups' coldest sample environment for XMCD and XAS studies at surface structures. It combines a surface science grade sample preparation chamber with an ultracold (100mK) cryostat and high magnetic fields of up to 7T and can be operated at the brightest soft x-ray beamline in the world (P04, PETRA III).

CAD drawing of the assembled experiment with a total height of about 3.5 m: (1) Dilution refrigerator section with coldfinger and sample holder. (2) Vector magnet (±7 T horizontal, ±0.5 T vertical) with UHV cross. (3) Slewing transfer system. (4) Preparation chamber. (5) Two-piece transportation and adjustment frame. The coordinate system is related to the vector magnet axis. Reproduced from Beeck et. al.,Rev. Sci. Instr. 87, 045116 (2016), with the permission of AIP Publishing.

Further to state of the art surface cleaning and preparation methods (effusion cell, sputter gun, gas inlet system) in the preparation chamber and a load lock for fast sample exchange, the endstation offers the following key measurement conditions:

Selected key chamber parameters

Max. sample area

19mm x 19mm

Sample temperature range

0.1K - 20K (optimal: 0.1K - 4K)

Max. magn. field parallel to photon beam

-7T to +7T

Max. magn. field perpendicular to photon beam

-1T to +1T

Magn. field tuning speed

~0.5T/min

Sample rotation

fully adjustable from normal (90°) to grazing incidence (0°)

Sample preparation temperature range

40K - 600K

 

Print this Document   Sitemap   Contact  


 
top