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Magnetism laboratory: static and dynamic properties
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UHV ferromagnetic resonance (FMR) / in situ FMR, MOKE & SQUID |
- UHV base pressure of < 1 * 10-10 mbar
- two independent systems
- Low energy electron diffraction (LEED) for surface structure characterisation, IV-LEED for measuring out of plane lattice parameter
- Auger-electron spectroscopy (AES) for chemical characterisation
- Hydrogen and Oxygen rf plasma cleaning (up to 200 W)
- Ar ion etching (100-3000 eV)
- automated temperature control in the range of liquid Nitrogen (77 K) up to 900 K with a stability of +/- 0.5 K
- electron beam evaporation of Fe, Co, Ni, Ag, Pt, Au, Al, Si, W (more possible) in the range from 0.1 nm to ten nm, using rods or crucibles.
- co-evaporation of up to four (normally two) materials, successive evaporation of up to eight (normally 4) materials
- changeable evaporator without breaking main vacuum
- in situ longitudinal magnetooptical Kerr-effect (MOKE) up to +/-120 mT
- in situ superconducting quantum interference device (SQUID)
- transferable sample holders
- in and out of plane angular dependent ferromagnetic resonance (FMR) measurements with cavities (1, 4 and 9 GHz) at fields up to 1.3 T
- in plane FMR from 1.5 to 26.5 GHz in continuous frequencies
- changeable cavities / continuous technique without breaking the main vacuum
- standard sample size: 3.9 x 3.9 x 0.5 mm³, other possible
Photos: UHV-chamber R2D2 - UHV-chamber Bender - in situ MOKE - H-Plasma - O-Plasma
Contact:
Lab. Phone: 0203.379.4413
M. Farle
J. Lindner
F. M. Römer
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Ferromagnetic and paramegnetic resonance (FMR, EPR, ESR) |
- Automatic in-plane and out-of-plane angular dependent measurements
- Magnetic field up to 2.2T
- Microwave cavities with quality factors of up to 8000
- Frequency-tunable cavities (8-14GHz)
- Microwave bridges and cavities for L, S, X, K and Q-Band
- Field modulation up to 100kHz
- Sample size up to 4x4mm2 (X-Band)
- Low temperature (5K to RT) helium cryostat for X, K and Q-Band
- High temperature unit for T = 80-800K
Photos: Fully automated setup - High sensitivity setup
Contact:
Lab. Phone: 0203.379.4414
M. Farle
J. Lindner
F. M. Römer
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Magneto optical Kerr-Effect (MOKE) |
- ex situ: Automatic in-plane angular dependent measurements with step resolution < 0.1°
- single ML Fe detection possible
- ex situ fields +/- 60 mT with air coil for high precision small field measurements
- same setup used for in and ex situ MOKE
- typical sample size: 4x4 mm², up to 12x12mm² possible
- using home-made single polarisation direction detector or commercial two components detector
Photos: Ex situ MOKE - In situ MOKE
Contact:
Lab. Phone: 0203.379.4428
M. Farle
J. Lindner
F. M. Römer
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