Department Spin and Topology in Quantum Materials

Instrumentation and contact information

Photoemission electron microscopy

Magnetic nanostructures are at the heart of modern data storage technology. Typical dimensions of magnetic bits are in the sub-100nm region. In addition novel magnetoelectronics devices such as magnetic random access memory junctions are operated on the sub-100nm m scale. An understanding magnetic properties of such low-dimensional structures is only accessible to spectro-microscopy tools capable of appropriate lateral resolution. This goal is achieved by combining a novel spin-resolved photoemission microscope (SPEEM) with a dedicated microfocus PGM beamline with full x-ray polarization control (UE49-PGM).

The synergy between the microscopy capabilities of the PEEM and the polarization control of synchrotron radiation makes of X-PEEM the ideal tool for space resolved and element selective investigation of nanostructures by means of chemical maps (XAS) and  magnetic imaging (XMCD and XLD).

The recent upgrade of the microscope allows for magnetic and spectroscopic imaging in a wide temperature range (40 K to 600 K) under applied magnetic and/or electric fields. For more information visit the following link XPEEM

Angle resolved photoemission spectroscopy

1 squared chamber

1³ ARPES

This experiment is built in a collaborative effort by the IFW Dresden, TU Dresden and the HZB, to enable experiments that require the highest energy resolution at ultimately low sample temperatures. To achieve this goal, all contributions to experimental broadening ---the resolution of both the excitation source and the electron energy analyzer as well as the sample temperature--- have been reduced to ≤1 meV or their equivalent, yielding the name of the station: 1 meV x 1 meV x 1 K = 1³.

1² ARPES

The 1 squared ARPES system is aimed at a much wider spectrum of angle-resolved photoemission experiments than its 1 cubed sibling. The system is equipped with a manipulator with 6 degrees-of-freedom (the IFW Dresden designed Cryoax 6) that allows for a much broader exploration of reciprocal space. In addition, the system has versatile sample handling and preparation facilities.

Spin-ARPES

The spin-ARPES end station features a SCIENTA R4000 analyzer coupled to two Mott-type spin detectors, enabling high-resolution measurements of electronic band structure and all three spin polarization components. A motorized six-axis manipulator allows precise sample positioning for spin- and angle-resolved measurements in any direction of reciprocal space, down to 40 K. Temperature-dependent studies between 300 and 40 K are supported. The preparation chamber includes two heating stations, a sputter gun, LEED, ports for four exchangeable evaporators, and a magnetic coil applying pulsed fields up to 300 mT in any direction. The Spin-ARPES station is installed at the U125/2-SGM beamline.

Magnetic soft-x-ray scattering and absorption

VEKMAG

VEKMAG is a vector superconducting magnet instrument for XAS/XMCD, resonant and off-resonant soft x-ray scattering, and time-resolved ferromagnetic resonance using XMCD. It operates in high magnetic fields and a temperature range of 2–500 K. The system provides fields of 9 T (beam direction), 2 T (horizontal), and 1 T (perpendicular), with a 1 T vector field available in all directions.

ALICE II

ALICE II is a diffractometer/reflectometer designed for x-ray resonant magnetic scattering. It features a two-circle goniometer with 175° 2θ range and a ±7.1 kOe magnetic field via a rotatable yoke in the horizontal scattering plane. Mounted on a mobile support frame, it can be positioned at different beamlines as needed.

Contact information