VEKMAG@PM2
Vector Superconducting Magnet
VEKMAG is a Vector Superconducting Magnet instrument designed for XAS/XMCD measurements, for resonant and-off resonant soft X-ray scattering methods, as well as for time resolved ferromagnetic resonance using XMCD, in high magnetic fields and for a temperature range of 2 K - 500 K. It provides a 9T field in the beam direction, a 2T field in the horizontal plane and a 1T field in the perpendicular direction. A 1T vectorial field can be applied in all directions.
The instrument is hosted at the bending magnet beamline PM2which offers an extremely stable beam. To be able to change the polarization of the x-rays very rapidly, a hexapod vacuum chamber with six moveable legs supporting a mirror was developed. Slight changes of the leg positions can change the orientation of the first mirror and thereby the polarization of the x-ray beam in just seconds. This prototype arrangement improves the signal-to-noise ratio by a factor of more than ten.
VEKMAG has being jointly developed by Regensburg University, Free University Berlin, Ruhr University Bochum, and Helmholtz Zentrum Berlin.
Selected Applications:- Spintronics
- Low dimensional magnetism
- Molecular magnetism
Methods
Remote access
depends on experiment - please discuss with Instrument Scientist
| Instrument data | |
|---|---|
| Phone (~49 30 8062-) | 14834 |
| Beam availability | 24h/d |
| Source | D51 (Dipole) |
| Monochromator | PM-2 |
| Energy range (at experiment) | tba |
| Energy resolution | variable |
| Flux | ~5 x 109 photons/sec |
| Polarisation | Circular, Horizontal |
| Focus size (hor. x vert.) | Variable between • 60 µm x 50 µm • 800 µm x 800 µm |
| Temperature range | 0.325 - 500 K |
| Pressure range | UHV |
| Detector | Photodiodes: FY, transmission drain current: TEY Large area detectors: 4kCCD , 2kCCD |
| Manipulators | • Low Temperature - Variable Temperature Insert (LT-VTI) for 2 - 350 K • Ferromagnetic resonance - Variable Temperature Insert (FMR-VTI) for 8 - 500 K • Very Low Temperature - Variable Temperature Insert (VLT-VTI) for 325 mK - 350 K |
| Sample holder compatibility | Compatible with Omicron plates |
| Additional equipment | Single axis magnetic fields:
• 9 T along the beam direction • 2T perpendicular to the beam direction, in the horizontal plane • 1T along the vertical direction. Vectorial magnetic fields: • 2T in the horizontal plane • 1T in all directions • Microwave excitation capability (XFMR) • Electrical transport capability |
| Additional information | Further details: beamline PM2 |
| Gratings | 1200, 150 lines/mm |
| Polarization switching time | 2 seconds |
| Mirror coating | Ta |